From b8c93555285c9f7a686907febfadeebe0455a32d Mon Sep 17 00:00:00 2001 From: Jason Mulligan Date: Fri, 20 Mar 2026 19:57:27 -0400 Subject: [PATCH 01/28] Add CLAUDE.md and AGENTS.md, replace eslint with oxfmt/oxlint --- AGENTS.md | 22 + CLAUDE.md | 1 + package-lock.json | 1161 +++++++++++++++------------------------------ package.json | 6 +- 4 files changed, 406 insertions(+), 784 deletions(-) create mode 100644 AGENTS.md create mode 100644 CLAUDE.md diff --git a/AGENTS.md b/AGENTS.md new file mode 100644 index 0000000..55cb46e --- /dev/null +++ b/AGENTS.md @@ -0,0 +1,22 @@ +# AGENTS.md + +## Setup Commands + +```bash +npm install # Install dependencies +npm run build # Lint and build (runs lint then rollup) +npm run rollup # Build with rollup +npm run test # Run lint and tests +npm run mocha # Run tests with coverage (c8) +npm run fmt # Format code with oxfmt +npm run lint # Lint code with oxlint +``` + +## Development Workflow + +Source code is in `src/`. + +- **lint**: Check and fix linting issues with oxlint +- **fmt**: Format code with oxfmt +- **build**: Lint + rollup build +- **mocha**: Run test suite with coverage reporting diff --git a/CLAUDE.md b/CLAUDE.md new file mode 100644 index 0000000..43c994c --- /dev/null +++ b/CLAUDE.md @@ -0,0 +1 @@ +@AGENTS.md diff --git a/package-lock.json b/package-lock.json index abc1572..d28a132 100644 --- a/package-lock.json +++ b/package-lock.json @@ -12,9 +12,10 @@ "@rollup/plugin-terser": "^1.0.0", "auto-changelog": "^2.5.0", "c8": "^11.0.0", - "eslint": "^9.29.0", "husky": "^9.1.7", "mocha": "^11.7.0", + "oxfmt": "^0.16.0", + "oxlint": "^0.16.0", "rollup": "^4.43.0", "tinybench": "^6.0.0" }, @@ -22,14 +23,6 @@ "node": ">=12" } }, - "node_modules/@aashutoshrathi/word-wrap": { - "version": "1.2.6", - "dev": true, - "license": "MIT", - "engines": { - "node": ">=0.10.0" - } - }, "node_modules/@bcoe/v8-coverage": { "version": "1.0.2", "resolved": "https://registry.npmjs.org/@bcoe/v8-coverage/-/v8-coverage-1.0.2.tgz", @@ 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"node_modules/lodash.merge": { - "version": "4.6.2", - "dev": true, - "license": "MIT" - }, "node_modules/log-symbols": { "version": "4.1.0", "dev": true, @@ -1844,17 +1482,6 @@ "url": "https://github.com/sponsors/sindresorhus" } }, - "node_modules/minimatch": { - "version": "3.1.2", - "dev": true, - "license": "ISC", - "dependencies": { - "brace-expansion": "^1.1.7" - }, - "engines": { - "node": "*" - } - }, "node_modules/minimist": { "version": "1.2.8", "dev": true, @@ -1957,11 +1584,6 @@ "dev": true, "license": "MIT" }, - "node_modules/natural-compare": { - "version": "1.4.0", - "dev": true, - "license": "MIT" - }, "node_modules/neo-async": { "version": "2.6.2", "dev": true, @@ -1986,20 +1608,57 @@ } } }, - "node_modules/optionator": { - "version": "0.9.3", + "node_modules/oxfmt": { + "version": "0.16.0", + "resolved": "https://registry.npmjs.org/oxfmt/-/oxfmt-0.16.0.tgz", + "integrity": 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"sha512-7rKUyy33Q1yc98pQ1DAmLtwX109F7TIfWlW1Ydo8Wl1ii1SeHieeh0HHfPeL2fMXK6z0s8ecKs9frCuLJvndBg==", - "dev": true, - "license": "BSD-2-Clause", - "dependencies": { - "punycode": "^2.1.0" - } - }, "node_modules/v8-to-istanbul": { "version": "9.3.0", "resolved": "https://registry.npmjs.org/v8-to-istanbul/-/v8-to-istanbul-9.3.0.tgz", diff --git a/package.json b/package.json index c3bf37e..d1d1e46 100644 --- a/package.json +++ b/package.json @@ -38,7 +38,8 @@ "benchmark:install-deps": "npm install --no-save lru-cache quick-lru mnemonist", "benchmark:all": "npm run benchmark:modern && npm run benchmark:perf && npm run benchmark:comparison", "changelog": "auto-changelog -p", - "lint": "eslint --fix *.js src/*.js tests/**/*.js benchmarks/*.js", + "fmt": "oxfmt --write *.js src/*.js tests/**/*.js benchmarks/*.js", + "lint": "oxlint --fix *.js src/*.js tests/**/*.js benchmarks/*.js", "mocha": "c8 mocha \"tests/**/*.js\"", "rollup": "rollup --config", "test": "npm run lint && npm run mocha", @@ -48,7 +49,8 @@ "@rollup/plugin-terser": "^1.0.0", "auto-changelog": "^2.5.0", "c8": "^11.0.0", - "eslint": "^9.29.0", + "oxfmt": "^0.16.0", + "oxlint": "^0.16.0", "husky": "^9.1.7", "mocha": "^11.7.0", "rollup": "^4.43.0", From 6bf7ef8e9c2c99ec50a1dbfd9d7a3686318b8062 Mon Sep 17 00:00:00 2001 From: Jason Mulligan Date: Fri, 20 Mar 2026 19:58:20 -0400 Subject: [PATCH 02/28] Remove .cursor directory --- .cursor/rules/javascript.mdc | 14 -------------- 1 file changed, 14 deletions(-) delete mode 100644 .cursor/rules/javascript.mdc diff --git a/.cursor/rules/javascript.mdc b/.cursor/rules/javascript.mdc deleted file mode 100644 index 78c6287..0000000 --- a/.cursor/rules/javascript.mdc +++ /dev/null @@ -1,14 +0,0 @@ ---- -description: JavaScript module -globs: -alwaysApply: true ---- - -- Use JSDoc standard for creating docblocks of functions and classes. -- Always use camelCase for function names. -- Always use upper-case snake_case for constants. -- Create integration tests in 'tests/integration' that use node-assert, which run with mocha. -- Create unit tests in 'tests/unit' that use node-assert, which run with mocha. -- Use node.js community "Best Practices". -- Adhere to DRY, KISS, YAGNI, & SOLID principles -- Adhere to OWASP security guidance From 0d34942fa7d7994e8c41e75e2d2079344094966f Mon Sep 17 00:00:00 2001 From: Jason Mulligan Date: Fri, 20 Mar 2026 20:01:34 -0400 Subject: [PATCH 03/28] Update AGENTS.md with project info, remove c8 dependency --- AGENTS.md | 51 ++++++++- package-lock.json | 279 ++++++---------------------------------------- package.json | 7 +- 3 files changed, 82 insertions(+), 255 deletions(-) diff --git a/AGENTS.md b/AGENTS.md index 55cb46e..122362a 100644 --- a/AGENTS.md +++ b/AGENTS.md @@ -1,15 +1,19 @@ # AGENTS.md +## Project Overview + +`tiny-lru` is a high-performance, lightweight LRU (Least Recently Used) cache library for JavaScript with O(1) operations and optional TTL support. + ## Setup Commands ```bash npm install # Install dependencies -npm run build # Lint and build (runs lint then rollup) -npm run rollup # Build with rollup -npm run test # Run lint and tests -npm run mocha # Run tests with coverage (c8) -npm run fmt # Format code with oxfmt -npm run lint # Lint code with oxlint +npm run build # Lint and build (runs lint then rollup) +npm run rollup # Build with rollup +npm run test # Run lint and tests +npm run mocha # Run tests with coverage (c8) +npm run fmt # Format code with oxfmt +npm run lint # Lint code with oxlint ``` ## Development Workflow @@ -20,3 +24,38 @@ Source code is in `src/`. - **fmt**: Format code with oxfmt - **build**: Lint + rollup build - **mocha**: Run test suite with coverage reporting + +## Project Structure + +``` +├── src/lru.js # Main LRU cache implementation +├── tests/ # Test files +├── benchmarks/ # Performance benchmarks +├── dist/ # Built distribution files +├── types/ # TypeScript definitions +├── docs/ # Documentation +├── rollup.config.js # Build configuration +└── package.json # Project configuration +``` + +## Code Style + +- Indentation: Tabs +- Quotes: Double quotes +- Semicolons: Required +- Array constructor: Avoid `new Array()` (oxlint will warn) + +## API Reference + +- `lru(max, ttl, resetTtl)` - Factory function to create cache +- `LRU` class - Direct instantiation with `new LRU(max, ttl, resetTtl)` +- Key methods: `get()`, `set()`, `delete()`, `has()`, `clear()`, `evict()` +- Array methods: `keys()`, `values()`, `entries()` +- Properties: `first`, `last`, `max`, `size`, `ttl`, `resetTtl` + +## Testing + +- Framework: Mocha +- Coverage: 100% (c8) +- Test pattern: `tests/**/*.js` +- All tests must pass with 100% coverage before merging diff --git a/package-lock.json b/package-lock.json index d28a132..549b8cc 100644 --- a/package-lock.json +++ b/package-lock.json @@ -11,7 +11,6 @@ "devDependencies": { "@rollup/plugin-terser": "^1.0.0", "auto-changelog": "^2.5.0", - "c8": "^11.0.0", "husky": "^9.1.7", "mocha": "^11.7.0", "oxfmt": "^0.16.0", @@ -23,16 +22,6 @@ "node": ">=12" } }, - "node_modules/@bcoe/v8-coverage": { - "version": "1.0.2", - "resolved": "https://registry.npmjs.org/@bcoe/v8-coverage/-/v8-coverage-1.0.2.tgz", - "integrity": "sha512-6zABk/ECA/QYSCQ1NGiVwwbQerUCZ+TQbp64Q3AgmfNvurHH0j8TtXa1qbShXA6qqkpAj4V5W8pP6mLe1mcMqA==", - "dev": true, - "license": "MIT", - "engines": { - "node": ">=18" - } - }, "node_modules/@isaacs/cliui": { "version": "8.0.2", "resolved": "https://registry.npmjs.org/@isaacs/cliui/-/cliui-8.0.2.tgz", @@ -136,16 +125,6 @@ "url": "https://github.com/chalk/wrap-ansi?sponsor=1" } }, - "node_modules/@istanbuljs/schema": { - "version": "0.1.3", - "resolved": "https://registry.npmjs.org/@istanbuljs/schema/-/schema-0.1.3.tgz", - "integrity": "sha512-ZXRY4jNvVgSVQ8DL3LTcakaAtXwTVUxE81hslsyD2AtoXW/wVob10HkOJ1X/pAlcI7D+2YoZKg5do8G/w6RYgA==", - "dev": true, - "license": "MIT", - "engines": { - "node": ">=8" - } - }, "node_modules/@jridgewell/gen-mapping": { "version": "0.3.5", 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"os": [ @@ -697,6 +700,9 @@ "riscv64" ], "dev": true, + "libc": [ + "glibc" + ], "license": "MIT", "optional": true, "os": [ @@ -711,6 +717,9 @@ "riscv64" ], "dev": true, + "libc": [ + "musl" + ], "license": "MIT", "optional": true, "os": [ @@ -725,6 +734,9 @@ "s390x" ], "dev": true, + "libc": [ + "glibc" + ], "license": "MIT", "optional": true, "os": [ @@ -850,13 +862,6 @@ "dev": true, "license": "MIT" }, - "node_modules/@types/istanbul-lib-coverage": { - "version": "2.0.6", - "resolved": "https://registry.npmjs.org/@types/istanbul-lib-coverage/-/istanbul-lib-coverage-2.0.6.tgz", - "integrity": "sha512-2QF/t/auWm0lsy8XtKVPG19v3sSOQlJe/YHZgfjb/KBBHOGSV+J2q/S671rcq9uTBrLAXmZpqJiaQbMT+zNU1w==", - "dev": true, - "license": "MIT" - }, "node_modules/acorn": { "version": "8.15.0", "resolved": "https://registry.npmjs.org/acorn/-/acorn-8.15.0.tgz", @@ -932,40 +937,6 @@ "dev": true, "license": "MIT" }, - "node_modules/c8": { - "version": "11.0.0", - "resolved": 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"sha512-3O/iVVsJAPsOnpwWIeD+d6z/7PmqApyQePUtCndjatj/9I5LylHvt5qluFaBT3I5h3r1ejfR056c+FCv+NnNXg==", - "dev": true, - "license": "BlueOak-1.0.0", - "dependencies": { - "lru-cache": "^11.0.0", - "minipass": "^7.1.2" - }, - "engines": { - "node": "18 || 20 || >=22" - }, - "funding": { - "url": "https://github.com/sponsors/isaacs" - } - }, "node_modules/tinybench": { "version": "6.0.0", "resolved": "https://registry.npmjs.org/tinybench/-/tinybench-6.0.0.tgz", @@ -2156,21 +1960,6 @@ "node": ">=0.8.0" } }, - "node_modules/v8-to-istanbul": { - "version": "9.3.0", - "resolved": "https://registry.npmjs.org/v8-to-istanbul/-/v8-to-istanbul-9.3.0.tgz", - "integrity": "sha512-kiGUalWN+rgBJ/1OHZsBtU4rXZOfj/7rKQxULKlIzwzQSvMJUUNgPwJEEh7gU6xEVxC0ahoOBvN2YI8GH6FNgA==", - "dev": true, - "license": "ISC", - "dependencies": { - "@jridgewell/trace-mapping": "^0.3.12", - "@types/istanbul-lib-coverage": "^2.0.1", - "convert-source-map": "^2.0.0" - }, - "engines": { - "node": ">=10.12.0" - } - }, "node_modules/webidl-conversions": { "version": "3.0.1", "dev": true, diff --git a/package.json b/package.json index d1d1e46..e73fdde 100644 --- a/package.json +++ b/package.json @@ -40,7 +40,7 @@ "changelog": "auto-changelog -p", "fmt": "oxfmt --write *.js src/*.js tests/**/*.js benchmarks/*.js", "lint": "oxlint --fix *.js src/*.js tests/**/*.js benchmarks/*.js", - "mocha": "c8 mocha \"tests/**/*.js\"", + "mocha": "mocha \"tests/**/*.js\"", "rollup": "rollup --config", "test": "npm run lint && npm run mocha", "prepare": "husky" @@ -48,11 +48,10 @@ "devDependencies": { "@rollup/plugin-terser": "^1.0.0", "auto-changelog": "^2.5.0", - "c8": "^11.0.0", - "oxfmt": "^0.16.0", - "oxlint": "^0.16.0", "husky": "^9.1.7", "mocha": "^11.7.0", + "oxfmt": "^0.16.0", + "oxlint": "^0.16.0", "rollup": "^4.43.0", "tinybench": "^6.0.0" }, From b4f1e2e5121c0808f93e0bbe643b938c859b044c Mon Sep 17 00:00:00 2001 From: Jason Mulligan Date: Fri, 20 Mar 2026 20:02:52 -0400 Subject: [PATCH 04/28] Remove mocha and c8 dependencies, simplify test script --- package-lock.json | 1007 +-------------------------------------------- package.json | 4 +- 2 files changed, 12 insertions(+), 999 deletions(-) diff --git a/package-lock.json b/package-lock.json index 549b8cc..6b3ab85 100644 --- a/package-lock.json +++ b/package-lock.json @@ -12,7 +12,6 @@ "@rollup/plugin-terser": "^1.0.0", "auto-changelog": "^2.5.0", "husky": "^9.1.7", - "mocha": "^11.7.0", "oxfmt": "^0.16.0", "oxlint": "^0.16.0", "rollup": "^4.43.0", @@ -22,109 +21,6 @@ "node": ">=12" } }, - "node_modules/@isaacs/cliui": { - "version": "8.0.2", - "resolved": "https://registry.npmjs.org/@isaacs/cliui/-/cliui-8.0.2.tgz", - "integrity": "sha512-O8jcjabXaleOG9DQ0+ARXWZBTfnP4WNAqzuiJK7ll44AmxGKv/J2M4TPjxjY3znBCfvBXFzucm1twdyFybFqEA==", - "dev": true, - "license": "ISC", - "dependencies": { - "string-width": "^5.1.2", - "string-width-cjs": "npm:string-width@^4.2.0", - "strip-ansi": "^7.0.1", - "strip-ansi-cjs": "npm:strip-ansi@^6.0.1", - "wrap-ansi": "^8.1.0", - "wrap-ansi-cjs": "npm:wrap-ansi@^7.0.0" - }, - "engines": { - "node": ">=12" - } - }, - "node_modules/@isaacs/cliui/node_modules/ansi-regex": { - "version": "6.1.0", - "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-6.1.0.tgz", - "integrity": "sha512-7HSX4QQb4CspciLpVFwyRe79O3xsIZDDLER21kERQ71oaPodF8jL725AgJMFAYbooIqolJoRLuM81SpeUkpkvA==", - "dev": true, - "license": "MIT", - "engines": { - "node": ">=12" - }, - "funding": { - "url": "https://github.com/chalk/ansi-regex?sponsor=1" - } - }, - "node_modules/@isaacs/cliui/node_modules/ansi-styles": { - "version": "6.2.1", - "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-6.2.1.tgz", - "integrity": "sha512-bN798gFfQX+viw3R7yrGWRqnrN2oRkEkUjjl4JNn4E8GxxbjtG3FbrEIIY3l8/hrwUwIeCZvi4QuOTP4MErVug==", - "dev": true, - "license": "MIT", - "engines": { - "node": ">=12" - }, - "funding": { - "url": "https://github.com/chalk/ansi-styles?sponsor=1" - } - }, - "node_modules/@isaacs/cliui/node_modules/emoji-regex": { - "version": "9.2.2", - "resolved": "https://registry.npmjs.org/emoji-regex/-/emoji-regex-9.2.2.tgz", - "integrity": "sha512-L18DaJsXSUk2+42pv8mLs5jJT2hqFkFE4j21wOmgbUqsZ2hL72NsUU785g9RXgo3s0ZNgVl42TiHp3ZtOv/Vyg==", - "dev": true, - "license": "MIT" - }, - "node_modules/@isaacs/cliui/node_modules/string-width": { - "version": "5.1.2", - "resolved": "https://registry.npmjs.org/string-width/-/string-width-5.1.2.tgz", - "integrity": "sha512-HnLOCR3vjcY8beoNLtcjZ5/nxn2afmME6lhrDrebokqMap+XbeW8n9TXpPDOqdGK5qcI3oT0GKTW6wC7EMiVqA==", - "dev": true, - "license": "MIT", - "dependencies": { - "eastasianwidth": "^0.2.0", - "emoji-regex": "^9.2.2", - "strip-ansi": "^7.0.1" - }, - "engines": { - "node": ">=12" - }, - "funding": { - "url": "https://github.com/sponsors/sindresorhus" - } - }, - "node_modules/@isaacs/cliui/node_modules/strip-ansi": { - "version": "7.1.0", - "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-7.1.0.tgz", - "integrity": "sha512-iq6eVVI64nQQTRYq2KtEg2d2uU7LElhTJwsH4YzIHZshxlgZms/wIc4VoDQTlG/IvVIrBKG06CrZnp0qv7hkcQ==", - "dev": true, - "license": "MIT", - "dependencies": { - "ansi-regex": "^6.0.1" - }, - "engines": { - "node": ">=12" - }, - "funding": { - "url": "https://github.com/chalk/strip-ansi?sponsor=1" - } - }, - "node_modules/@isaacs/cliui/node_modules/wrap-ansi": { - "version": "8.1.0", - "resolved": "https://registry.npmjs.org/wrap-ansi/-/wrap-ansi-8.1.0.tgz", - "integrity": "sha512-si7QWI6zUMq56bESFvagtmzMdGOtoxfR+Sez11Mobfc7tm+VkUckk9bW2UeffTGVUbOksxmSw0AA2gs8g71NCQ==", - "dev": true, - "license": "MIT", - "dependencies": { - "ansi-styles": "^6.1.0", - "string-width": "^5.0.1", - "strip-ansi": "^7.0.1" - }, - "engines": { - "node": ">=12" - }, - "funding": { - "url": "https://github.com/chalk/wrap-ansi?sponsor=1" - } - }, "node_modules/@jridgewell/gen-mapping": { "version": "0.3.5", "resolved": "https://registry.npmjs.org/@jridgewell/gen-mapping/-/gen-mapping-0.3.5.tgz", @@ -428,17 +324,6 @@ "win32" ] }, - "node_modules/@pkgjs/parseargs": { - "version": "0.11.0", - "resolved": "https://registry.npmjs.org/@pkgjs/parseargs/-/parseargs-0.11.0.tgz", - "integrity": "sha512-+1VkjdD0QBLPodGrJUeqarH8VAIvQODIbwh9XpP5Syisf7YoQgsJKPNFoqqLQlu+VQ/tVSshMR6loPMn8U+dPg==", - "dev": true, - "license": "MIT", - "optional": true, - "engines": { - "node": ">=14" - } - }, "node_modules/@rollup/plugin-terser": { "version": "1.0.0", "resolved": "https://registry.npmjs.org/@rollup/plugin-terser/-/plugin-terser-1.0.0.tgz", @@ -875,33 +760,6 @@ "node": ">=0.4.0" } }, - "node_modules/ansi-regex": { - "version": "5.0.1", - "dev": true, - "license": "MIT", - "engines": { - "node": ">=8" - } - }, - "node_modules/ansi-styles": { - "version": "4.3.0", - "dev": true, - "license": "MIT", - "dependencies": { - "color-convert": "^2.0.1" - }, - "engines": { - "node": ">=8" - }, - "funding": { - "url": 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- }, - "node_modules/wrap-ansi-cjs": { - "name": "wrap-ansi", - "version": "7.0.0", - "resolved": "https://registry.npmjs.org/wrap-ansi/-/wrap-ansi-7.0.0.tgz", - "integrity": "sha512-YVGIj2kamLSTxw6NsZjoBxfSwsn0ycdesmc4p+Q21c5zPuZ1pl+NfxVdxPtdHvmNVOQ6XSYG4AUtyt/Fi7D16Q==", - "dev": true, - "license": "MIT", - "dependencies": { - "ansi-styles": "^4.0.0", - "string-width": "^4.1.0", - "strip-ansi": "^6.0.0" - }, - "engines": { - "node": ">=10" - }, - "funding": { - "url": "https://github.com/chalk/wrap-ansi?sponsor=1" - } - }, - "node_modules/y18n": { - "version": "5.0.8", - "resolved": "https://registry.npmjs.org/y18n/-/y18n-5.0.8.tgz", - "integrity": "sha512-0pfFzegeDWJHJIAmTLRP2DwHjdF5s7jo9tuztdQxAhINCdvS+3nGINqPd00AphqJR/0LhANUS6/+7SCb98YOfA==", - "dev": true, - "license": "ISC", - "engines": { - "node": ">=10" - } - }, - "node_modules/yargs": { - "version": "17.7.2", - "resolved": "https://registry.npmjs.org/yargs/-/yargs-17.7.2.tgz", - "integrity": 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"rollup": "rollup --config", - "test": "npm run lint && npm run mocha", + "test": "npm run lint", "prepare": "husky" }, "devDependencies": { "@rollup/plugin-terser": "^1.0.0", "auto-changelog": "^2.5.0", "husky": "^9.1.7", - "mocha": "^11.7.0", "oxfmt": "^0.16.0", "oxlint": "^0.16.0", "rollup": "^4.43.0", From b0cba3a7d97a0efbf629526d927f023d26b1b58e Mon Sep 17 00:00:00 2001 From: Jason Mulligan Date: Fri, 20 Mar 2026 20:06:03 -0400 Subject: [PATCH 05/28] Update oxfmt and oxlint versions --- package-lock.json | 700 +++++++++++++++++++++++++++++++++++++++------- package.json | 4 +- 2 files changed, 596 insertions(+), 108 deletions(-) diff --git a/package-lock.json b/package-lock.json index 6b3ab85..0af45fd 100644 --- a/package-lock.json +++ b/package-lock.json @@ -12,8 +12,8 @@ "@rollup/plugin-terser": "^1.0.0", "auto-changelog": "^2.5.0", "husky": "^9.1.7", - "oxfmt": "^0.16.0", - "oxlint": "^0.16.0", + "oxfmt": "^0.41.0", + "oxlint": "^1.56.0", "rollup": "^4.43.0", "tinybench": "^6.0.0" }, @@ -76,10 +76,44 @@ "@jridgewell/sourcemap-codec": "^1.4.14" } }, - "node_modules/@oxfmt/darwin-arm64": { - "version": "0.16.0", - "resolved": "https://registry.npmjs.org/@oxfmt/darwin-arm64/-/darwin-arm64-0.16.0.tgz", - "integrity": "sha512-I+Unj7wePcUTK7p/YKtgbm4yer6dw7dTlmCJa0UilFZyge5uD4rwCSfSDx3A+a6Z3A60/SqXMbNR2UyidWF4Cg==", + "node_modules/@oxfmt/binding-android-arm-eabi": { + "version": "0.41.0", + "resolved": "https://registry.npmjs.org/@oxfmt/binding-android-arm-eabi/-/binding-android-arm-eabi-0.41.0.tgz", + "integrity": "sha512-REfrqeMKGkfMP+m/ScX4f5jJBSmVNYcpoDF8vP8f8eYPDuPGZmzp56NIUsYmx3h7f6NzC6cE3gqh8GDWrJHCKw==", + "cpu": [ + "arm" + ], + "dev": true, + "license": "MIT", + "optional": true, + "os": [ + "android" + ], + "engines": { + "node": "^20.19.0 || >=22.12.0" + } + }, + "node_modules/@oxfmt/binding-android-arm64": { + "version": "0.41.0", + "resolved": "https://registry.npmjs.org/@oxfmt/binding-android-arm64/-/binding-android-arm64-0.41.0.tgz", + "integrity": "sha512-s0b1dxNgb2KomspFV2LfogC2XtSJB42POXF4bMCLJyvQmAGos4ZtjGPfQreToQEaY0FQFjz3030ggI36rF1q5g==", + "cpu": [ + "arm64" + ], + "dev": true, + "license": "MIT", + "optional": true, + "os": [ + "android" + ], + "engines": { + "node": "^20.19.0 || >=22.12.0" + } + }, + "node_modules/@oxfmt/binding-darwin-arm64": { + "version": "0.41.0", + "resolved": "https://registry.npmjs.org/@oxfmt/binding-darwin-arm64/-/binding-darwin-arm64-0.41.0.tgz", + "integrity": "sha512-EGXGualADbv/ZmamE7/2DbsrYmjoPlAmHEpTL4vapLF4EfVD6fr8/uQDFnPJkUBjiSWFJZtFNsGeN1B6V3owmA==", "cpu": [ "arm64" ], @@ -88,12 +122,15 @@ "optional": true, "os": [ "darwin" - ] + ], + "engines": { + "node": "^20.19.0 || >=22.12.0" + } }, - "node_modules/@oxfmt/darwin-x64": { - "version": "0.16.0", - "resolved": "https://registry.npmjs.org/@oxfmt/darwin-x64/-/darwin-x64-0.16.0.tgz", - "integrity": "sha512-EfiXFKEOV5gXgEatFK89OOoSmd8E9Xq83TcjPLWQNFBO4cgaQsfKmctpgJmJjQnoUwD7nQsm0ruj3ae7Gva8QA==", + 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"optional": true, + "os": [ + "linux" + ], + "engines": { + "node": "^20.19.0 || >=22.12.0" + } + }, + "node_modules/@oxfmt/binding-linux-arm64-gnu": { + "version": "0.41.0", + "resolved": "https://registry.npmjs.org/@oxfmt/binding-linux-arm64-gnu/-/binding-linux-arm64-gnu-0.41.0.tgz", + "integrity": "sha512-gofu0PuumSOHYczD8p62CPY4UF6ee+rSLZJdUXkpwxg6pILiwSDBIouPskjF/5nF3A7QZTz2O9KFNkNxxFN9tA==", "cpu": [ "arm64" ], @@ -119,12 +210,15 @@ "optional": true, "os": [ "linux" - ] + ], + "engines": { + "node": "^20.19.0 || >=22.12.0" + } }, - "node_modules/@oxfmt/linux-arm64-musl": { - "version": "0.16.0", - "resolved": "https://registry.npmjs.org/@oxfmt/linux-arm64-musl/-/linux-arm64-musl-0.16.0.tgz", - "integrity": "sha512-I9WeYe1/YnrfXgXVaKkZITZzil0G0g9IknS2KJbq1lOnpTw3dwViXZ7XMa2cq6Mv7S+4SoDImb7fLQ59AfVX/w==", + "node_modules/@oxfmt/binding-linux-arm64-musl": { + "version": "0.41.0", + "resolved": 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"node_modules/@oxlint/binding-win32-x64-msvc": { + "version": "1.56.0", + "resolved": "https://registry.npmjs.org/@oxlint/binding-win32-x64-msvc/-/binding-win32-x64-msvc-1.56.0.tgz", + "integrity": "sha512-ZHa0clocjLmIDr+1LwoWtxRcoYniAvERotvwKUYKhH41NVfl0Y4LNbyQkwMZzwDvKklKGvGZ5+DAG58/Ik47tQ==", "cpu": [ "x64" ], @@ -322,7 +765,10 @@ "optional": true, "os": [ "win32" - ] + ], + "engines": { + "node": "^20.19.0 || >=22.12.0" + } }, "node_modules/@rollup/plugin-terser": { "version": "1.0.0", @@ -909,11 +1355,14 @@ } }, "node_modules/oxfmt": { - "version": "0.16.0", - "resolved": "https://registry.npmjs.org/oxfmt/-/oxfmt-0.16.0.tgz", - "integrity": "sha512-uRnnBAN0zH07FXSfvSKbIw+Jrohv4Px2RwNiZOGI4/pvns4sx0+k4WSt+tqwd7bDeoWaXiGmhZgnbK63hi6hVQ==", + "version": "0.41.0", + "resolved": "https://registry.npmjs.org/oxfmt/-/oxfmt-0.41.0.tgz", + "integrity": "sha512-sKLdJZdQ3bw6x9qKiT7+eID4MNEXlDHf5ZacfIircrq6Qwjk0L6t2/JQlZZrVHTXJawK3KaMuBoJnEJPcqCEdg==", "dev": true, "license": "MIT", + "dependencies": { + "tinypool": "2.1.0" + }, "bin": { "oxfmt": "bin/oxfmt" }, @@ -924,41 +1373,70 @@ "url": "https://github.com/sponsors/Boshen" }, "optionalDependencies": { - "@oxfmt/darwin-arm64": "0.16.0", - "@oxfmt/darwin-x64": "0.16.0", - "@oxfmt/linux-arm64-gnu": "0.16.0", - "@oxfmt/linux-arm64-musl": "0.16.0", - "@oxfmt/linux-x64-gnu": "0.16.0", - "@oxfmt/linux-x64-musl": "0.16.0", - "@oxfmt/win32-arm64": "0.16.0", - "@oxfmt/win32-x64": "0.16.0" + "@oxfmt/binding-android-arm-eabi": "0.41.0", + "@oxfmt/binding-android-arm64": "0.41.0", + "@oxfmt/binding-darwin-arm64": "0.41.0", + "@oxfmt/binding-darwin-x64": "0.41.0", + "@oxfmt/binding-freebsd-x64": "0.41.0", + "@oxfmt/binding-linux-arm-gnueabihf": "0.41.0", + "@oxfmt/binding-linux-arm-musleabihf": "0.41.0", + "@oxfmt/binding-linux-arm64-gnu": "0.41.0", + "@oxfmt/binding-linux-arm64-musl": "0.41.0", + "@oxfmt/binding-linux-ppc64-gnu": "0.41.0", + "@oxfmt/binding-linux-riscv64-gnu": "0.41.0", + "@oxfmt/binding-linux-riscv64-musl": "0.41.0", + "@oxfmt/binding-linux-s390x-gnu": "0.41.0", + "@oxfmt/binding-linux-x64-gnu": "0.41.0", + "@oxfmt/binding-linux-x64-musl": "0.41.0", + "@oxfmt/binding-openharmony-arm64": "0.41.0", + "@oxfmt/binding-win32-arm64-msvc": "0.41.0", + "@oxfmt/binding-win32-ia32-msvc": "0.41.0", + "@oxfmt/binding-win32-x64-msvc": "0.41.0" } }, "node_modules/oxlint": { - "version": "0.16.12", - "resolved": "https://registry.npmjs.org/oxlint/-/oxlint-0.16.12.tgz", - "integrity": "sha512-1oN3P9bzE90zkbjLTc+uICVLwSR+eQaDaYVipS0BtmtmEd3ccQue0y7npCinb35YqKzIv1LZxhoU9nm5fgmQuw==", + "version": "1.56.0", + "resolved": "https://registry.npmjs.org/oxlint/-/oxlint-1.56.0.tgz", + "integrity": "sha512-Q+5Mj5PVaH/R6/fhMMFzw4dT+KPB+kQW4kaL8FOIq7tfhlnEVp6+3lcWqFruuTNlUo9srZUW3qH7Id4pskeR6g==", "dev": true, "license": "MIT", "bin": { - "oxc_language_server": "bin/oxc_language_server", "oxlint": "bin/oxlint" }, "engines": { - "node": ">=8.*" + "node": "^20.19.0 || >=22.12.0" }, "funding": { "url": "https://github.com/sponsors/Boshen" }, "optionalDependencies": { - "@oxlint/darwin-arm64": "0.16.12", - "@oxlint/darwin-x64": "0.16.12", - "@oxlint/linux-arm64-gnu": "0.16.12", - "@oxlint/linux-arm64-musl": "0.16.12", - "@oxlint/linux-x64-gnu": "0.16.12", - "@oxlint/linux-x64-musl": "0.16.12", - "@oxlint/win32-arm64": "0.16.12", - "@oxlint/win32-x64": "0.16.12" + "@oxlint/binding-android-arm-eabi": "1.56.0", + "@oxlint/binding-android-arm64": "1.56.0", + "@oxlint/binding-darwin-arm64": "1.56.0", + "@oxlint/binding-darwin-x64": "1.56.0", + "@oxlint/binding-freebsd-x64": "1.56.0", + "@oxlint/binding-linux-arm-gnueabihf": "1.56.0", + "@oxlint/binding-linux-arm-musleabihf": "1.56.0", + "@oxlint/binding-linux-arm64-gnu": "1.56.0", + "@oxlint/binding-linux-arm64-musl": "1.56.0", + "@oxlint/binding-linux-ppc64-gnu": "1.56.0", + "@oxlint/binding-linux-riscv64-gnu": "1.56.0", + "@oxlint/binding-linux-riscv64-musl": "1.56.0", + "@oxlint/binding-linux-s390x-gnu": "1.56.0", + "@oxlint/binding-linux-x64-gnu": "1.56.0", + "@oxlint/binding-linux-x64-musl": "1.56.0", + "@oxlint/binding-openharmony-arm64": "1.56.0", + "@oxlint/binding-win32-arm64-msvc": "1.56.0", + "@oxlint/binding-win32-ia32-msvc": "1.56.0", + "@oxlint/binding-win32-x64-msvc": "1.56.0" + }, + "peerDependencies": { + "oxlint-tsgolint": ">=0.15.0" + }, + "peerDependenciesMeta": { + "oxlint-tsgolint": { + "optional": true + } } }, "node_modules/parse-github-url": { @@ -1102,6 +1580,16 @@ "node": ">=20.0.0" } }, + "node_modules/tinypool": { + "version": "2.1.0", + "resolved": "https://registry.npmjs.org/tinypool/-/tinypool-2.1.0.tgz", + "integrity": "sha512-Pugqs6M0m7Lv1I7FtxN4aoyToKg1C4tu+/381vH35y8oENM/Ai7f7C4StcoK4/+BSw9ebcS8jRiVrORFKCALLw==", + "dev": true, + "license": "MIT", + "engines": { + "node": "^20.0.0 || >=22.0.0" + } + }, "node_modules/tr46": { "version": "0.0.3", "dev": true, diff --git a/package.json b/package.json index 7e4f2e9..611fbfc 100644 --- a/package.json +++ b/package.json @@ -48,8 +48,8 @@ "@rollup/plugin-terser": "^1.0.0", "auto-changelog": "^2.5.0", "husky": "^9.1.7", - "oxfmt": "^0.16.0", - "oxlint": "^0.16.0", + "oxfmt": "^0.41.0", + "oxlint": "^1.56.0", "rollup": "^4.43.0", "tinybench": "^6.0.0" }, From 2be6af3ca83b9d9eaf23d86920110612148b1a9e Mon Sep 17 00:00:00 2001 From: Jason Mulligan Date: Fri, 20 Mar 2026 20:08:44 -0400 Subject: [PATCH 06/28] Use Node's native test runner --- package.json | 2 +- tests/unit/lru.js | 119 +++++++++++++--------------------------------- 2 files changed, 34 insertions(+), 87 deletions(-) diff --git a/package.json b/package.json index 611fbfc..4ffe554 100644 --- a/package.json +++ b/package.json @@ -41,7 +41,7 @@ "fmt": "oxfmt --write *.js src/*.js tests/**/*.js benchmarks/*.js", "lint": "oxlint --fix *.js src/*.js tests/**/*.js benchmarks/*.js", "rollup": "rollup --config", - "test": "npm run lint", + "test": "npm run lint && node --test tests/**/*.js", "prepare": "husky" }, "devDependencies": { diff --git a/tests/unit/lru.js b/tests/unit/lru.js index 4137fad..e7eb87a 100644 --- a/tests/unit/lru.js +++ b/tests/unit/lru.js @@ -1,5 +1,6 @@ import {LRU, lru} from "../../src/lru.js"; -import {strict as assert} from "assert"; +import {describe, it, beforeEach} from "node:test"; +import assert from "node:assert"; describe("LRU Cache", function () { describe("Constructor", function () { @@ -129,7 +130,7 @@ describe("LRU Cache", function () { cache.set("key1", "value1"); cache.set("key2", "value2"); cache.set("key3", "value3"); - cache.set("key4", "value4"); // Should evict key1 + cache.set("key4", "value4"); assert.equal(cache.size, 3); assert.equal(cache.has("key1"), false); @@ -143,10 +144,9 @@ describe("LRU Cache", function () { cache.set("key2", "value2"); cache.set("key3", "value3"); - // Access key1 to make it most recently used cache.get("key1"); - cache.set("key4", "value4"); // Should evict key2, not key1 + cache.set("key4", "value4"); assert.equal(cache.has("key1"), true); assert.equal(cache.has("key2"), false); @@ -162,7 +162,6 @@ describe("LRU Cache", function () { let keys = cache.keys(); assert.deepEqual(keys, ["key1", "key2", "key3"]); - // Access key1 to move it to end cache.get("key1"); keys = cache.keys(); assert.deepEqual(keys, ["key2", "key3", "key1"]); @@ -300,7 +299,7 @@ describe("LRU Cache", function () { let cache; beforeEach(function () { - cache = new LRU(5, 100); // 100ms TTL + cache = new LRU(5, 100); }); it("should set expiration time", function () { @@ -309,23 +308,21 @@ describe("LRU Cache", function () { const expiresAt = cache.expiresAt("key1"); assert.ok(expiresAt >= beforeTime + 100); - assert.ok(expiresAt <= beforeTime + 200); // Allow some margin + assert.ok(expiresAt <= beforeTime + 200); }); it("should return undefined for non-existent key expiration", function () { assert.equal(cache.expiresAt("nonexistent"), undefined); }); - it("should expire items after TTL", function (done) { + it("should expire items after TTL", async function () { cache.set("key1", "value1"); assert.equal(cache.get("key1"), "value1"); - setTimeout(() => { - assert.equal(cache.get("key1"), undefined); - assert.equal(cache.has("key1"), false); - assert.equal(cache.size, 0); - done(); - }, 150); + await new Promise((resolve) => setTimeout(resolve, 150)); + assert.equal(cache.get("key1"), undefined); + assert.equal(cache.has("key1"), false); + assert.equal(cache.size, 0); }); it("should handle TTL = 0 (no expiration)", function () { @@ -334,37 +331,28 @@ describe("LRU Cache", function () { assert.equal(neverExpireCache.expiresAt("key1"), 0); }); - it("should reset TTL when accessing with resetTtl=true", function (done) { + it("should reset TTL when accessing with resetTtl=true", async function () { const resetCache = new LRU(5, 1000, true); resetCache.set("key1", "value1"); - // Check that expiration timestamp changes when updating with resetTtl=true const firstExpiry = resetCache.expiresAt("key1"); - // Small delay to ensure timestamp difference - setTimeout(() => { - resetCache.set("key1", "value1", false, true); // This should reset TTL - const secondExpiry = resetCache.expiresAt("key1"); + await new Promise((resolve) => setTimeout(resolve, 10)); + resetCache.set("key1", "value1", false, true); + const secondExpiry = resetCache.expiresAt("key1"); - assert.ok(secondExpiry > firstExpiry, "TTL should be reset"); - done(); - }, 10); + assert.ok(secondExpiry > firstExpiry, "TTL should be reset"); }); - it("should not reset TTL when resetTtl=false", function (done) { + it("should not reset TTL when resetTtl=false", async function () { const noResetCache = new LRU(5, 100, false); noResetCache.set("key1", "value1"); - setTimeout(() => { - // Access the key but don't reset TTL - assert.equal(noResetCache.get("key1"), "value1"); + await new Promise((resolve) => setTimeout(resolve, 50)); + assert.equal(noResetCache.get("key1"), "value1"); - // Check that it expires at original time - setTimeout(() => { - assert.equal(noResetCache.get("key1"), undefined); - done(); - }, 75); - }, 50); + await new Promise((resolve) => setTimeout(resolve, 75)); + assert.equal(noResetCache.get("key1"), undefined); }); }); @@ -373,7 +361,7 @@ describe("LRU Cache", function () { const cache = new LRU(3); cache.set("key1", "value1"); cache.set("key2", "value2"); - cache.set("key1", "newvalue1"); // Update existing key + cache.set("key1", "newvalue1"); assert.equal(cache.get("key1"), "newvalue1"); assert.equal(cache.size, 2); @@ -385,15 +373,12 @@ describe("LRU Cache", function () { cache.set("key2", "value2"); cache.set("key3", "value3"); - // Delete middle item cache.delete("key2"); assert.deepEqual(cache.keys(), ["key1", "key3"]); - // Delete first item cache.delete("key1"); assert.deepEqual(cache.keys(), ["key3"]); - // Delete last item cache.delete("key3"); assert.deepEqual(cache.keys(), []); assert.equal(cache.first, null); @@ -407,10 +392,9 @@ describe("LRU Cache", function () { cache.set("c", 3); cache.set("d", 4); - // Access items in different order - cache.set("b", 22); // Move b to end - cache.get("a"); // Move a to end - cache.set("c", 33); // Move c to end + cache.set("b", 22); + cache.get("a"); + cache.set("c", 33); assert.deepEqual(cache.keys(), ["d", "b", "a", "c"]); }); @@ -420,7 +404,6 @@ describe("LRU Cache", function () { cache.set("key1", "value1"); cache.set("key2", "value2"); - // Set with bypass=true should not reposition but still updates to last cache.set("key1", "newvalue1", true); assert.deepEqual(cache.keys(), ["key2", "key1"]); }); @@ -430,21 +413,18 @@ describe("LRU Cache", function () { const beforeTime = Date.now(); cache.set("key1", "value1"); - // Set with resetTtl=true should update expiry cache.set("key1", "newvalue1", false, true); const expiresAt = cache.expiresAt("key1"); - assert.ok(expiresAt > beforeTime + 900); // Should be close to current time + TTL + assert.ok(expiresAt > beforeTime + 900); }); it("should handle single item cache operations", function () { const cache = new LRU(1); - // Set first item cache.set("key1", "value1"); assert.equal(cache.first, cache.last); assert.equal(cache.size, 1); - // Replace with second item cache.set("key2", "value2"); assert.equal(cache.first, cache.last); assert.equal(cache.size, 1); @@ -455,13 +435,11 @@ describe("LRU Cache", function () { it("should handle empty cache operations", function () { const cache = new LRU(3); - // Operations on empty cache assert.equal(cache.get("key1"), undefined); assert.equal(cache.has("key1"), false); - cache.delete("key1"); // Should not throw + cache.delete("key1"); assert.equal(cache.expiresAt("key1"), undefined); - // Evict on empty cache cache.evict(); assert.equal(cache.size, 0); }); @@ -472,7 +450,6 @@ describe("LRU Cache", function () { cache.set("key2", "value2"); cache.set("key3", "value3"); - // Access the last item (should not change position) cache.get("key3"); assert.deepEqual(cache.keys(), ["key1", "key2", "key3"]); }); @@ -482,19 +459,16 @@ describe("LRU Cache", function () { it("should handle large number of operations", function () { const cache = new LRU(1000); - // Add 1000 items for (let i = 0; i < 1000; i++) { cache.set(`key${i}`, `value${i}`); } assert.equal(cache.size, 1000); - // Access random items for (let i = 0; i < 100; i++) { const key = `key${Math.floor(Math.random() * 1000)}`; cache.get(key); } - // Add more items to trigger eviction for (let i = 1000; i < 1100; i++) { cache.set(`key${i}`, `value${i}`); } @@ -515,7 +489,7 @@ describe("LRU Cache", function () { describe("Additional coverage tests", function () { it("should handle setWithEvicted with unlimited cache size", function () { - const cache = new LRU(0); // Unlimited size + const cache = new LRU(0); const evicted = cache.setWithEvicted("key1", "value1"); assert.equal(evicted, null); assert.equal(cache.size, 1); @@ -533,31 +507,28 @@ describe("LRU Cache", function () { cache.set("key1", "value1"); const originalExpiry = cache.expiresAt("key1"); - // Call set with bypass=true, resetTtl=false cache.set("key1", "newvalue1", true, false); const newExpiry = cache.expiresAt("key1"); - // TTL should not be reset assert.equal(originalExpiry, newExpiry); }); it("should set expiry when using setWithEvicted with ttl > 0", function () { - const cache = new LRU(2, 100); // ttl > 0 + const cache = new LRU(2, 100); const before = Date.now(); cache.set("a", 1); cache.set("b", 2); - const evicted = cache.setWithEvicted("c", 3); // triggers eviction and new item creation + const evicted = cache.setWithEvicted("c", 3); assert.notEqual(evicted, null); const expiry = cache.expiresAt("c"); assert.ok(expiry >= before + 100); - assert.ok(expiry <= before + 250); // allow some margin + assert.ok(expiry <= before + 250); }); it("should set expiry to 0 when resetTtl=true and ttl=0 on update", function () { - const cache = new LRU(2, 0); // ttl = 0 + const cache = new LRU(2, 0); cache.set("x", 1); assert.equal(cache.expiresAt("x"), 0); - // update existing key with resetTtl=true to exercise branch in set() cache.set("x", 2, false, true); assert.equal(cache.expiresAt("x"), 0); }); @@ -565,22 +536,12 @@ describe("LRU Cache", function () { it("should handle moveToEnd edge case by direct method invocation", function () { const cache = new LRU(1); - // Add a single item cache.set("only", "value"); - // Create a minimal test case that directly exercises the uncovered lines - // The edge case in moveToEnd (lines 275-276) occurs when: - // 1. An item is moved that was the first item (making first = item.next = null) - // 2. But the cache wasn't empty (last !== null) - // 3. The condition if (this.first === null) triggers to restore consistency - const item = cache.first; assert.equal(cache.first, cache.last); assert.equal(item, cache.last); - // Since moveToEnd has early return for item === last, we need to - // create a scenario where the item is first but not last - // Let's create a second dummy item and manipulate pointers const dummyItem = { key: "dummy", value: "dummy", @@ -589,34 +550,20 @@ describe("LRU Cache", function () { expiry: 0 }; - // Set up the linked list: item <-> dummyItem item.next = dummyItem; cache.last = dummyItem; - // Now item is first but not last, so moveToEnd won't early return - // When moveToEnd processes item: - // 1. Sets first = item.next (which is dummyItem) - // 2. Removes item from its position - // 3. But then we manipulate to make first = null to trigger the edge case - - // Temporarily null out the next pointer to simulate the edge case const originalNext = item.next; item.next = null; - // This manipulation will cause first to become null in moveToEnd - // triggering the if (this.first === null) condition on lines 274-276 cache.first = null; - cache.last = dummyItem; // last is not null + cache.last = dummyItem; - // Now call moveToEnd - this should trigger the uncovered lines cache.moveToEnd(item); - // Verify the edge case was handled correctly assert.equal(cache.first, item); - // Restore the item for cleanup item.next = originalNext; }); }); }); - From c92facc320260d58cc60569cb5acbe37c774566e Mon Sep 17 00:00:00 2001 From: Jason Mulligan Date: Fri, 20 Mar 2026 20:10:49 -0400 Subject: [PATCH 07/28] Replace new Array() with Array.from() to fix lint warnings --- benchmarks/comparison-benchmark.js | 4 ++-- benchmarks/modern-benchmark.js | 4 ++-- benchmarks/performance-observer-benchmark.js | 2 +- src/lru.js | 6 +++--- 4 files changed, 8 insertions(+), 8 deletions(-) diff --git a/benchmarks/comparison-benchmark.js b/benchmarks/comparison-benchmark.js index 69cb2cd..1eae753 100644 --- a/benchmarks/comparison-benchmark.js +++ b/benchmarks/comparison-benchmark.js @@ -50,8 +50,8 @@ const OPS_PER_INVOCATION = 50; // Do multiple ops per call to reduce harness ove * @returns {{keys: string[], values: Array<{id:number,data:string,nested:{foo:string,baz:number}}>} } */ function generateTestData (count) { - const keys = new Array(count); - const values = new Array(count); + const keys = Array.from({ length: count }); + const values = Array.from({ length: count }); for (let i = 0; i < count; i++) { keys[i] = `key_${i}`; diff --git a/benchmarks/modern-benchmark.js b/benchmarks/modern-benchmark.js index ed06560..8170df3 100644 --- a/benchmarks/modern-benchmark.js +++ b/benchmarks/modern-benchmark.js @@ -17,7 +17,7 @@ const ITERATIONS = { * @returns {Array<{key:string,value:string}>} */ function generateRandomData (size) { - const data = new Array(size); + const data = Array.from({ length: size }); let x = 2463534242; for (let i = 0; i < size; i++) { // xorshift32 @@ -33,7 +33,7 @@ function generateRandomData (size) { } function generateSequentialData (size) { - const data = new Array(size); + const data = Array.from({ length: size }); for (let i = 0; i < size; i++) { data[i] = { key: `seq_key_${i}`, diff --git a/benchmarks/performance-observer-benchmark.js b/benchmarks/performance-observer-benchmark.js index 9929990..c813334 100644 --- a/benchmarks/performance-observer-benchmark.js +++ b/benchmarks/performance-observer-benchmark.js @@ -67,7 +67,7 @@ class CustomTimer { // Test data generation function generateTestData (size) { - const out = new Array(size); + const out = Array.from({ length: size }); for (let i = 0; i < size; i++) { out[i] = { key: `key_${i}`, diff --git a/src/lru.js b/src/lru.js index 8ed976d..d4654cc 100644 --- a/src/lru.js +++ b/src/lru.js @@ -119,7 +119,7 @@ export class LRU { * @since 11.1.0 */ entries (keys = this.keys()) { - const result = new Array(keys.length); + const result = Array.from({ length: keys.length }); for (let i = 0; i < keys.length; i++) { const key = keys[i]; result[i] = [key, this.get(key)]; @@ -302,7 +302,7 @@ export class LRU { * @since 9.0.0 */ keys () { - const result = new Array(this.size); + const result = Array.from({ length: this.size }); let x = this.first; let i = 0; @@ -436,7 +436,7 @@ export class LRU { * @since 11.1.0 */ values (keys = this.keys()) { - const result = new Array(keys.length); + const result = Array.from({ length: keys.length }); for (let i = 0; i < keys.length; i++) { result[i] = this.get(keys[i]); } From dee4f55f67d4ccad28bbf3a57fd587896b68b35d Mon Sep 17 00:00:00 2001 From: Jason Mulligan Date: Fri, 20 Mar 2026 20:13:09 -0400 Subject: [PATCH 08/28] Audit fixes: has() TTL check, evict() null guard, lazy default params, setWithEvicted cleanup --- src/lru.js | 29 +++++++++++++++++++++++------ 1 file changed, 23 insertions(+), 6 deletions(-) diff --git a/src/lru.js b/src/lru.js index d4654cc..31908b1 100644 --- a/src/lru.js +++ b/src/lru.js @@ -76,9 +76,9 @@ export class LRU { * @since 1.0.0 */ delete (key) { - if (this.has(key)) { - const item = this.items[key]; + const item = this.items[key]; + if (item !== undefined) { delete this.items[key]; this.size--; @@ -118,7 +118,11 @@ export class LRU { * @see {@link LRU#values} * @since 11.1.0 */ - entries (keys = this.keys()) { + entries (keys) { + if (keys === undefined) { + keys = this.keys(); + } + const result = Array.from({ length: keys.length }); for (let i = 0; i < keys.length; i++) { const key = keys[i]; @@ -145,6 +149,10 @@ export class LRU { if (bypass || this.size > 0) { const item = this.first; + if (!item) { + return this; + } + delete this.items[item.key]; if (--this.size === 0) { @@ -237,7 +245,8 @@ export class LRU { * @since 9.0.0 */ has (key) { - return key in this.items; + const item = this.items[key]; + return item !== undefined && (this.ttl === 0 || item.expiry > Date.now()); } /** @@ -338,7 +347,11 @@ export class LRU { this.set(key, value, true, resetTtl); } else { if (this.max > 0 && this.size === this.max) { - evicted = {...this.first}; + evicted = { + key: this.first.key, + value: this.first.value, + expiry: this.first.expiry + }; this.evict(true); } @@ -435,7 +448,11 @@ export class LRU { * @see {@link LRU#entries} * @since 11.1.0 */ - values (keys = this.keys()) { + values (keys) { + if (keys === undefined) { + keys = this.keys(); + } + const result = Array.from({ length: keys.length }); for (let i = 0; i < keys.length; i++) { result[i] = this.get(keys[i]); From c4bfb3cf85b055524e35cf30612973a6aa9ab485 Mon Sep 17 00:00:00 2001 From: Jason Mulligan Date: Fri, 20 Mar 2026 20:15:19 -0400 Subject: [PATCH 09/28] Rewrite README.md for new and experienced developers --- README.md | 692 +++++++++++------------------------------------------- 1 file changed, 132 insertions(+), 560 deletions(-) diff --git a/README.md b/README.md index 75d00f8..2aec976 100644 --- a/README.md +++ b/README.md @@ -1,264 +1,125 @@ -# 🚀 Tiny LRU +# Tiny LRU -[![npm version](https://badge.fury.io/js/tiny-lru.svg)](https://badge.fury.io/js/tiny-lru) -[![Node.js Version](https://img.shields.io/node/v/tiny-lru.svg)](https://nodejs.org/) -[![License](https://img.shields.io/badge/License-BSD%203--Clause-blue.svg)](https://opensource.org/licenses/BSD-3-Clause) -[![Build Status](https://github.com/avoidwork/tiny-lru/actions/workflows/ci.yml/badge.svg)](https://github.com/avoidwork/tiny-lru/actions) -[![Test Coverage](https://img.shields.io/badge/coverage-100%25-brightgreen.svg)](https://github.com/avoidwork/tiny-lru) +A fast, lightweight LRU (Least Recently Used) cache for JavaScript with O(1) operations and optional TTL support. -A **high-performance, lightweight** LRU cache for JavaScript with **strong UPDATE performance and competitive SET/GET/DELETE**, and a **compact bundle size**. Built for developers who need fast caching without compromising on features. +## What is an LRU Cache? -## 📦 Installation +Think of an LRU cache like a limited-size bookshelf. When you add a new book and the shelf is full, you remove the **least recently used** book to make room. Every time you read a book, it moves to the front. This pattern is perfect for caching where you want to keep the most frequently accessed items. + +## Installation ```bash npm install tiny-lru -# or -yarn add tiny-lru -# or -pnpm add tiny-lru ``` -**Requirements:** Node.js ≥12 +Requires Node.js ≥12. -## ⚡ Quick Start +## Quick Start ```javascript -import {lru} from "tiny-lru"; - -// Create cache and start using immediately -const cache = lru(100); // Max 100 items -cache.set('user:123', {name: 'John', age: 30}); -const user = cache.get('user:123'); // {name: 'John', age: 30} - -// With TTL (5 second expiration) -const tempCache = lru(50, 5000); -tempCache.set('session', 'abc123'); // Automatically expires after 5 seconds -``` - -## 📑 Table of Contents - -- [✨ Features & Benefits](#-features--benefits) -- [📊 Performance Deep Dive](#-performance-deep-dive) -- [📖 API Reference](#-api-reference) -- [🚀 Getting Started](#-getting-started) -- [💡 Real-World Examples](#-real-world-examples) -- [🔗 Interoperability](#-interoperability) -- [🛠️ Development](#️-development) -- [📄 License](#-license) - -## ✨ Features & Benefits - -### Why Choose Tiny LRU? - -- **🔄 Strong Cache Updates** - Excellent performance in update-heavy workloads -- **📦 Compact Bundle** - Just ~2.2 KiB minified for a full-featured LRU library -- **⚖️ Balanced Performance** - Competitive across all operations with O(1) complexity -- **⏱️ TTL Support** - Optional time-to-live with automatic expiration -- **🔄 Method Chaining** - Fluent API for better developer experience -- **🎯 TypeScript Ready** - Full TypeScript support with complete type definitions -- **🌐 Universal Compatibility** - Works seamlessly in Node.js and browsers -- **🛡️ Production Ready** - Battle-tested and reliable - -### Benchmark Comparison (Mean of 5 runs) - -| Library | SET ops/sec | GET ops/sec | UPDATE ops/sec | DELETE ops/sec | -|---------|-------------|-------------|----------------|----------------| -| **tiny-lru** | 404,753 | 1,768,449 | 1,703,716 | 298,770 | -| lru-cache | 326,221 | 1,069,061 | 878,858 | 277,734 | -| quick-lru | 591,683 | 1,298,487 | 935,481 | 359,600 | -| mnemonist | 412,467 | 2,478,778 | 2,156,690 | 0 | - -Notes: -- Mean values computed from the Performance Summary across 5 consecutive runs of `npm run benchmark:comparison`. -- mnemonist lacks a compatible delete method in this harness, so DELETE ops/sec is 0. -- Performance varies by hardware, Node.js version, and workload patterns; run the provided benchmarks locally to assess your specific use case. -- Environment: Node.js v24.5.0, macOS arm64. +import { lru } from "tiny-lru"; -## 📊 Performance Deep Dive - -### When to Choose Tiny LRU - -**✅ Perfect for:** -- **Frequent cache updates** - Leading UPDATE performance -- **Mixed read/write workloads** - Balanced across all operations -- **Bundle size constraints** - Compact library with full features -- **Production applications** - Battle-tested with comprehensive testing +// Create a cache that holds up to 100 items +const cache = lru(100); -### Running Your Own Benchmarks +// Store and retrieve data +cache.set("user:42", { name: "Alice", score: 1500 }); +const user = cache.get("user:42"); // { name: "Alice", score: 1500 } -```bash -# Run all performance benchmarks -npm run benchmark:all +// Chain operations +cache.set("a", 1).set("b", 2).set("c", 3); -# Individual benchmark suites -npm run benchmark:modern # Comprehensive Tinybench suite -npm run benchmark:perf # Performance measurements -npm run benchmark:comparison # Compare against other LRU libraries +// Check what's in the cache +cache.has("a"); // true +cache.size; // 3 +cache.keys(); // ['a', 'b', 'c'] (LRU order) ``` -## 🚀 Getting Started - -### Installation - -```bash -npm install tiny-lru -# or -yarn add tiny-lru -# or -pnpm add tiny-lru -``` +## With TTL (Time-to-Live) -### Quick Examples +Items can automatically expire after a set time: ```javascript -import {lru} from "tiny-lru"; - -// Basic cache -const cache = lru(100); -cache.set('key1', 'value1') - .set('key2', 'value2') - .set('key3', 'value3'); - -console.log(cache.get('key1')); // 'value1' -console.log(cache.size); // 3 +// Cache that expires after 5 seconds +const sessionCache = lru(100, 5000); -// With TTL (time-to-live) -const cacheWithTtl = lru(50, 30000); // 30 second TTL -cacheWithTtl.set('temp-data', {important: true}); -// Automatically expires after 30 seconds - -const resetCache = lru(25, 10000, true); -resetCache.set('session', 'user123'); -// Because resetTtl is true, TTL resets when you set() the same key again +sessionCache.set("session:id", { userId: 123 }); +// After 5 seconds, this returns undefined +sessionCache.get("session:id"); ``` -### CDN Usage (Browser) - -```html - - - - - - +Want TTL to reset when you update an item? Enable `resetTtl`: + +```javascript +const cache = lru(100, 60000, true); // 1 minute TTL, resets on update +cache.set("key", "value"); +cache.set("key", "new value"); // TTL resets ``` -### TypeScript Usage +## When to Use Tiny LRU -```typescript -import {lru, LRU} from "tiny-lru"; +**Great for:** +- API response caching +- Function memoization +- Session storage with expiration +- Rate limiting +- Any scenario where you want to limit memory usage -// Type-safe cache -const cache = lru(100); -// or: const cache: LRU = lru(100); -cache.set('user:123', 'John Doe'); -const user: string | undefined = cache.get('user:123'); +**Not ideal for:** +- Non-string keys (works best with strings) +- Very large caches (consider a database) -// Class inheritance -class MyCache extends LRU { - constructor() { - super(1000, 60000, true); // 1000 items, 1 min TTL, reset TTL on set - } -} -``` +## API Reference -### Configuration Options +### Factory Function: `lru(max?, ttl?, resetTtl?)` -#### Factory Function ```javascript -import {lru} from "tiny-lru"; +import { lru } from "tiny-lru"; -const cache = lru(max, ttl = 0, resetTtl = false); +const cache = lru(); // 1000 items, no TTL +const cache = lru(500); // 500 items, no TTL +const cache = lru(100, 30000); // 100 items, 30s TTL +const cache = lru(100, 60000, true); // with resetTtl enabled ``` -**Parameters:** -- `max` `{Number}` - Maximum number of items (0 = unlimited, default: 1000) -- `ttl` `{Number}` - Time-to-live in milliseconds (0 = no expiration, default: 0) -- `resetTtl` `{Boolean}` - Reset TTL when updating existing items via `set()` (default: false) +### Class: `new LRU(max?, ttl?, resetTtl?)` -#### Class Constructor ```javascript -import {LRU} from "tiny-lru"; - -const cache = new LRU(1000, 60000, true); // 1000 items, 1 min TTL, reset TTL on set -``` - -#### Best Practices -```javascript -// 1. Size your cache appropriately -const cache = lru(1000); // Not too small, not too large - -// 2. Use meaningful keys -cache.set(`user:${userId}:profile`, userProfile); -cache.set(`product:${productId}:details`, productDetails); - -// 3. Handle cache misses gracefully -function getData(key) { - const cached = cache.get(key); - if (cached !== undefined) { - return cached; - } - - // Fallback to slower data source - const data = expensiveOperation(key); - cache.set(key, data); - return data; -} +import { LRU } from "tiny-lru"; -// 4. Clean up when needed -process.on('exit', () => { - cache.clear(); // Help garbage collection -}); +const cache = new LRU(100, 5000); ``` -#### Optimization Tips -- **Cache Size**: Keep cache size reasonable (1000-10000 items for most use cases) -- **TTL Usage**: Only use TTL when necessary; it adds overhead -- **Key Types**: String keys perform better than object keys -- **Memory**: Call `clear()` when done to help garbage collection - -## 💡 Real-World Examples - -### API Response Caching +### Methods -```javascript -import {lru} from "tiny-lru"; +| Method | Description | +|--------|-------------| +| `set(key, value)` | Store a value. Returns `this` for chaining. | +| `get(key)` | Retrieve a value. Moves item to most recent. | +| `has(key)` | Check if key exists and is not expired. | +| `delete(key)` | Remove an item. Returns `this` for chaining. | +| `clear()` | Remove all items. Returns `this` for chaining. | +| `evict()` | Remove the least recently used item. | +| `keys()` | Get all keys in LRU order (oldest first). | +| `values(keys?)` | Get all values, or values for specific keys. | +| `entries(keys?)` | Get `[key, value]` pairs in LRU order. | +| `expiresAt(key)` | Get expiration timestamp for a key. | -class ApiClient { - constructor() { - this.cache = lru(100, 300000); // 5 minute cache - } +### Properties - async fetchUser(userId) { - const cacheKey = `user:${userId}`; - - // Return cached result if available - if (this.cache.has(cacheKey)) { - return this.cache.get(cacheKey); - } +| Property | Type | Description | +|----------|------|-------------| +| `size` | number | Current number of items | +| `max` | number | Maximum items allowed | +| `ttl` | number | Time-to-live in milliseconds | +| `first` | object | Least recently used item | +| `last` | object | Most recently used item | - // Fetch from API and cache - const response = await fetch(`/api/users/${userId}`); - const user = await response.json(); - - this.cache.set(cacheKey, user); - return user; - } -} -``` +## Common Patterns -### Function Memoization +### Memoization ```javascript -import {lru} from "tiny-lru"; - function memoize(fn, maxSize = 100) { const cache = lru(maxSize); @@ -269,386 +130,97 @@ function memoize(fn, maxSize = 100) { return cache.get(key); } - const result = fn.apply(this, args); + const result = fn(...args); cache.set(key, result); return result; }; } -// Usage -const expensiveCalculation = memoize((n) => { - console.log(`Computing for ${n}`); - return n * n * n; -}, 50); - -console.log(expensiveCalculation(5)); // Computing for 5 -> 125 -console.log(expensiveCalculation(5)); // 125 (cached) +// Cache expensive computations +const fib = memoize(n => n <= 1 ? n : fib(n - 1) + fib(n - 2), 50); +fib(100); // fast - cached +fib(100); // even faster - from cache ``` -### Session Management +### Cache-Aside Pattern ```javascript -import {lru} from "tiny-lru"; - -class SessionManager { - constructor() { - // 30 minute TTL, with resetTtl enabled for set() - this.sessions = lru(1000, 1800000, true); - } - - createSession(userId, data) { - const sessionId = this.generateId(); - const session = { - userId, - data, - createdAt: Date.now() - }; - - this.sessions.set(sessionId, session); - return sessionId; - } - - getSession(sessionId) { - // get() does not extend TTL; to extend, set the session again when resetTtl is true - return this.sessions.get(sessionId); - } - - endSession(sessionId) { - this.sessions.delete(sessionId); +async function getUser(userId) { + const cache = lru(1000, 60000); // 1 minute cache + + // Check cache first + const cached = cache.get(`user:${userId}`); + if (cached) { + return cached; } + + // Fetch from database + const user = await db.users.findById(userId); + + // Store in cache + cache.set(`user:${userId}`, user); + + return user; } ``` - - -## 🔗 Interoperability - -Compatible with Lodash's `memoize` function cache interface: +### Finding What Was Evicted ```javascript -import _ from "lodash"; -import {lru} from "tiny-lru"; - -_.memoize.Cache = lru().constructor; -const memoized = _.memoize(myFunc); -memoized.cache.max = 10; -``` - -## 🛠️ Development - -### Testing - -Tiny LRU maintains 100% test coverage with comprehensive unit and integration tests. - -```bash -# Run all tests with coverage -npm test - -# Run tests with verbose output -npm run mocha - -# Lint code -npm run lint - -# Full build (lint + build) -npm run build -``` - -**Test Coverage:** 100% coverage across all modules +const cache = lru(3); +cache.set("a", 1).set("b", 2).set("c", 3); -```console -----------|---------|----------|---------|---------|------------------- -File | % Stmts | % Branch | % Funcs | % Lines | Uncovered Line #s -----------|---------|----------|---------|---------|------------------- -All files | 100 | 100 | 100 | 100 | - lru.js | 100 | 100 | 100 | 100 | -----------|---------|----------|---------|---------|------------------- -``` - -### Contributing - -#### Quick Start for Contributors - -```bash -# Clone and setup -git clone https://github.com/avoidwork/tiny-lru.git -cd tiny-lru -npm install - -# Run tests -npm test +const evicted = cache.setWithEvicted("d", 4); +console.log(evicted); // { key: 'a', value: 1, expiry: 0 } -# Run linting -npm run lint - -# Run benchmarks -npm run benchmark:all - -# Build distribution files -npm run build +cache.keys(); // ['b', 'c', 'd'] ``` -#### Development Workflow - -1. **Fork** the repository on GitHub -2. **Clone** your fork locally -3. **Create** a feature branch: `git checkout -b feature/amazing-feature` -4. **Develop** your changes with tests -5. **Test** thoroughly: `npm test && npm run lint` -6. **Commit** using conventional commits: `git commit -m "feat: add amazing feature"` -7. **Push** to your fork: `git push origin feature/amazing-feature` -8. **Submit** a Pull Request - -#### Contribution Guidelines - -- **Code Quality**: Follow ESLint rules and existing code style -- **Testing**: Maintain 100% test coverage for all changes -- **Documentation**: Update README.md and JSDoc for API changes -- **Performance**: Benchmark changes that could impact performance -- **Compatibility**: Ensure Node.js ≥12 compatibility -- **Commit Messages**: Use [Conventional Commits](https://conventionalcommits.org/) format - ---- +## Advanced Usage -## 📖 API Reference - -### Factory Function - -#### lru(max, ttl, resetTtl) - -Creates a new LRU cache instance using the factory function. - -**Parameters:** -- `max` `{Number}` - Maximum number of items to store (default: 1000; 0 = unlimited) -- `ttl` `{Number}` - Time-to-live in milliseconds (default: 0; 0 = no expiration) -- `resetTtl` `{Boolean}` - Reset TTL when updating existing items via `set()` (default: false) - -**Returns:** `{LRU}` New LRU cache instance - -**Throws:** `{TypeError}` When parameters are invalid +### Batch Operations with Keys ```javascript -import {lru} from "tiny-lru"; - -// Basic cache const cache = lru(100); +cache.set("users:1", { name: "Alice" }); +cache.set("users:2", { name: "Bob" }); +cache.set("users:3", { name: "Carol" }); -// With TTL -const cacheWithTtl = lru(50, 30000); // 30 second TTL - -// With resetTtl enabled for set() -const resetCache = lru(25, 10000, true); - -// Validation errors -lru(-1); // TypeError: Invalid max value -lru(100, -1); // TypeError: Invalid ttl value -lru(100, 0, "no"); // TypeError: Invalid resetTtl value -``` - -### Properties - -#### first -`{Object|null}` - Item in first (least recently used) position - -```javascript -const cache = lru(); -cache.first; // null - empty cache -``` - -#### last -`{Object|null}` - Item in last (most recently used) position - -```javascript -const cache = lru(); -cache.last; // null - empty cache -``` - -#### max -`{Number}` - Maximum number of items to hold in cache - -```javascript -const cache = lru(500); -cache.max; // 500 -``` - -#### resetTtl -`{Boolean}` - Whether to reset TTL when updating existing items via `set()` - -```javascript -const cache = lru(500, 5*6e4, true); -cache.resetTtl; // true -``` - -#### size -`{Number}` - Current number of items in cache - -```javascript -const cache = lru(); -cache.size; // 0 - empty cache -``` - -#### ttl -`{Number}` - TTL in milliseconds (0 = no expiration) - -```javascript -const cache = lru(100, 3e4); -cache.ttl; // 30000 -``` - -### Methods - -#### clear() -Removes all items from cache. - -**Returns:** `{Object}` LRU instance - -```javascript -cache.clear(); +// Get values for specific keys +const values = cache.values(["users:3", "users:1"]); +// ['Carol', 'Alice'] - maintains LRU order ``` -#### delete(key) -Removes specified item from cache. - -**Parameters:** -- `key` `{String}` - Item key - -**Returns:** `{Object}` LRU instance +### Interop with Lodash ```javascript -cache.set('key1', 'value1'); -cache.delete('key1'); -console.log(cache.has('key1')); // false -``` - -#### entries([keys]) -Returns array of cache items as `[key, value]` pairs. - -**Parameters:** -- `keys` `{Array}` - Optional array of specific keys to retrieve (defaults to all keys) - -**Returns:** `{Array}` Array of `[key, value]` pairs - -```javascript -cache.set('a', 1).set('b', 2); -console.log(cache.entries()); // [['a', 1], ['b', 2]] -console.log(cache.entries(['a'])); // [['a', 1]] -``` - -#### evict() -Removes the least recently used item from cache. - -**Returns:** `{Object}` LRU instance - -```javascript -cache.set('old', 'value').set('new', 'value'); -cache.evict(); // Removes 'old' item -``` - -#### expiresAt(key) -Gets expiration timestamp for cached item. - -**Parameters:** -- `key` `{String}` - Item key - -**Returns:** `{Number|undefined}` Expiration time (epoch milliseconds) or undefined if key doesn't exist - -```javascript -const cache = new LRU(100, 5000); // 5 second TTL -cache.set('key1', 'value1'); -console.log(cache.expiresAt('key1')); // timestamp 5 seconds from now -``` - -#### get(key) -Retrieves cached item and promotes it to most recently used position. - -**Parameters:** -- `key` `{String}` - Item key - -**Returns:** `{*}` Item value or undefined if not found/expired - -Note: `get()` does not reset or extend TTL. TTL is only reset on `set()` when `resetTtl` is `true`. - -```javascript -cache.set('key1', 'value1'); -console.log(cache.get('key1')); // 'value1' -console.log(cache.get('nonexistent')); // undefined -``` - -#### has(key) -Checks if key exists in cache (without promoting it). - -**Parameters:** -- `key` `{String}` - Item key - -**Returns:** `{Boolean}` True if key exists and is not expired - -```javascript -cache.set('key1', 'value1'); -console.log(cache.has('key1')); // true -console.log(cache.has('nonexistent')); // false -``` - -#### keys() -Returns array of all cache keys in LRU order (first = least recent). - -**Returns:** `{Array}` Array of keys - -```javascript -cache.set('a', 1).set('b', 2); -cache.get('a'); // Move 'a' to most recent -console.log(cache.keys()); // ['b', 'a'] -``` - -#### set(key, value) -Stores item in cache as most recently used. - -**Parameters:** -- `key` `{String}` - Item key -- `value` `{*}` - Item value - -**Returns:** `{Object}` LRU instance - -```javascript -cache.set('key1', 'value1') - .set('key2', 'value2') - .set('key3', 'value3'); -``` - -#### setWithEvicted(key, value) -Stores item and returns evicted item if cache was full. - -**Parameters:** -- `key` `{String}` - Item key -- `value` `{*}` - Item value +import _ from "lodash"; +import { lru } from "tiny-lru"; -**Returns:** `{Object|null}` Evicted item `{key, value, expiry, prev, next}` or null +_.memoize.Cache = lru().constructor; -```javascript -const cache = new LRU(2); -cache.set('a', 1).set('b', 2); -const evicted = cache.setWithEvicted('c', 3); // evicted = {key: 'a', value: 1, ...} -if (evicted) { - console.log(`Evicted: ${evicted.key}`, evicted.value); -} +const slowFunc = _.memoize(expensiveOperation); +slowFunc.cache.max = 100; // Configure cache size ``` -#### values([keys]) -Returns array of cache values. +## Performance -**Parameters:** -- `keys` `{Array}` - Optional array of specific keys to retrieve (defaults to all keys) +All core operations are O(1): +- **Set**: Add or update items +- **Get**: Retrieve and promote to most recent +- **Delete**: Remove items +- **Has**: Quick existence check -**Returns:** `{Array}` Array of values +## Development -```javascript -cache.set('a', 1).set('b', 2); -console.log(cache.values()); // [1, 2] -console.log(cache.values(['a'])); // [1] +```bash +npm install # Install dependencies +npm test # Run lint and tests +npm run lint # Lint code +npm run fmt # Format code +npm run build # Build distribution files ``` ---- - -## 📄 License +## License -Copyright (c) 2026 Jason Mulligan -Licensed under the BSD-3 license. +BSD-3-Clause From 4b03957bd441dc482b2cb9de4aea4f0d66b2e365 Mon Sep 17 00:00:00 2001 From: Jason Mulligan Date: Fri, 20 Mar 2026 20:17:23 -0400 Subject: [PATCH 10/28] Add docs/API.md with complete API reference --- docs/API.md | 388 ++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 388 insertions(+) create mode 100644 docs/API.md diff --git a/docs/API.md b/docs/API.md new file mode 100644 index 0000000..3a4fd83 --- /dev/null +++ b/docs/API.md @@ -0,0 +1,388 @@ +# API Reference + +Complete API documentation for tiny-lru. + +## Table of Contents + +- [Factory Function](#factory-function) +- [LRU Class](#lru-class) +- [Properties](#properties) +- [Methods](#methods) + +--- + +## Factory Function + +### `lru(max?, ttl?, resetTtl?)` + +Creates a new LRU cache instance with parameter validation. + +```javascript +import { lru } from "tiny-lru"; + +const cache = lru(); +const cache = lru(100); +const cache = lru(100, 5000); +const cache = lru(100, 5000, true); +``` + +**Parameters:** + +| Name | Type | Default | Description | +|------|------|---------|-------------| +| `max` | `number` | `1000` | Maximum items. `0` = unlimited. Must be >= 0. | +| `ttl` | `number` | `0` | Time-to-live in milliseconds. `0` = no expiration. Must be >= 0. | +| `resetTtl` | `boolean` | `false` | Reset TTL when updating existing items via `set()` | + +**Returns:** `LRU` - New cache instance + +**Throws:** `TypeError` if parameters are invalid + +```javascript +lru(-1); // TypeError: Invalid max value +lru(100, -1); // TypeError: Invalid ttl value +lru(100, 0, "yes"); // TypeError: Invalid resetTtl value +``` + +--- + +## LRU Class + +### `new LRU(max?, ttl?, resetTtl?)` + +Creates an LRU cache instance. Does not validate parameters. + +```javascript +import { LRU } from "tiny-lru"; + +const cache = new LRU(100, 5000, true); +``` + +**Parameters:** + +| Name | Type | Default | Description | +|------|------|---------|-------------| +| `max` | `number` | `0` | Maximum items. `0` = unlimited. | +| `ttl` | `number` | `0` | Time-to-live in milliseconds. `0` = no expiration. | +| `resetTtl` | `boolean` | `false` | Reset TTL when updating via `set()` | + +--- + +## Properties + +### `size` + +`number` - Current number of items in cache. + +```javascript +const cache = lru(10); +cache.set("a", 1).set("b", 2); +console.log(cache.size); // 2 +``` + +### `max` + +`number` - Maximum number of items allowed. + +```javascript +const cache = lru(100); +console.log(cache.max); // 100 +``` + +### `ttl` + +`number` - Time-to-live in milliseconds. `0` = no expiration. + +```javascript +const cache = lru(100, 60000); +console.log(cache.ttl); // 60000 +``` + +### `resetTtl` + +`boolean` - Whether TTL resets on `set()` updates. + +```javascript +const cache = lru(100, 5000, true); +console.log(cache.resetTtl); // true +``` + +### `first` + +`Object | null` - Least recently used item (node with `key`, `value`, `prev`, `next`, `expiry`). + +```javascript +const cache = lru(2); +cache.set("a", 1).set("b", 2); +console.log(cache.first.key); // "a" +console.log(cache.first.value); // 1 +``` + +### `last` + +`Object | null` - Most recently used item. + +```javascript +const cache = lru(2); +cache.set("a", 1).set("b", 2); +console.log(cache.last.key); // "b" +``` + +--- + +## Methods + +### `clear()` + +Removes all items from cache. + +```javascript +cache.set("a", 1).set("b", 2); +cache.clear(); +console.log(cache.size); // 0 +``` + +**Returns:** `LRU` - this instance (for chaining) + +--- + +### `delete(key)` + +Removes item by key. + +```javascript +cache.set("a", 1).set("b", 2); +cache.delete("a"); +console.log(cache.has("a")); // false +console.log(cache.size); // 1 +``` + +**Parameters:** + +| Name | Type | Description | +|------|------|-------------| +| `key` | `string` | Key to delete | + +**Returns:** `LRU` - this instance (for chaining) + +--- + +### `entries(keys?)` + +Returns `[key, value]` pairs in LRU order. + +```javascript +cache.set("a", 1).set("b", 2).set("c", 3); +console.log(cache.entries()); +// [['a', 1], ['b', 2], ['c', 3]] + +console.log(cache.entries(["c", "a"])); +// [['c', 3], ['a', 1]] - respects LRU order +``` + +**Parameters:** + +| Name | Type | Description | +|------|------|-------------| +| `keys` | `string[]` | Optional specific keys to retrieve | + +**Returns:** `Array<[string, *]>` - Array of key-value pairs + +--- + +### `evict(bypass?)` + +Removes the least recently used item. + +```javascript +cache.set("a", 1).set("b", 2).set("c", 3); +cache.evict(); +console.log(cache.has("a")); // false +console.log(cache.keys()); // ['b', 'c'] +``` + +**Parameters:** + +| Name | Type | Default | Description | +|------|------|---------|-------------| +| `bypass` | `boolean` | `false` | Force eviction even when empty | + +**Returns:** `LRU` - this instance (for chaining) + +--- + +### `expiresAt(key)` + +Gets expiration timestamp for a key. + +```javascript +const cache = lru(100, 5000); +cache.set("key", "value"); +console.log(cache.expiresAt("key")); // timestamp ~5 seconds from now +console.log(cache.expiresAt("nonexistent")); // undefined +``` + +**Parameters:** + +| Name | Type | Description | +|------|------|-------------| +| `key` | `string` | Key to check | + +**Returns:** `number | undefined` - Expiration timestamp or undefined + +--- + +### `get(key)` + +Retrieves value and promotes to most recently used. + +```javascript +cache.set("a", 1).set("b", 2); +cache.get("a"); // 1 +console.log(cache.keys()); // ['b', 'a'] - 'a' moved to end +``` + +Expired items are deleted and return `undefined`. + +**Parameters:** + +| Name | Type | Description | +|------|------|-------------| +| `key` | `string` | Key to retrieve | + +**Returns:** `* | undefined` - Value or undefined if not found/expired + +--- + +### `has(key)` + +Checks if key exists and is not expired. + +```javascript +cache.set("a", 1); +cache.has("a"); // true +cache.has("nonexistent"); // false +``` + +**Parameters:** + +| Name | Type | Description | +|------|------|-------------| +| `key` | `string` | Key to check | + +**Returns:** `boolean` + +--- + +### `keys()` + +Returns all keys in LRU order (oldest first). + +```javascript +cache.set("a", 1).set("b", 2).set("c", 3); +cache.get("a"); // Promote 'a' +console.log(cache.keys()); // ['b', 'c', 'a'] +``` + +**Returns:** `string[]` + +--- + +### `set(key, value, bypass?, resetTtl?)` + +Stores value and moves to most recently used. + +```javascript +cache.set("a", 1).set("b", 2).set("c", 3); +console.log(cache.keys()); // ['a', 'b', 'c'] +``` + +**Parameters:** + +| Name | Type | Default | Description | +|------|------|---------|-------------| +| `key` | `string` | - | Item key | +| `value` | `*` | - | Item value | +| `bypass` | `boolean` | `false` | Internal flag for `setWithEvicted` | +| `resetTtl` | `boolean` | `this.resetTtl` | Reset TTL for this operation | + +**Returns:** `LRU` - this instance (for chaining) + +--- + +### `setWithEvicted(key, value, resetTtl?)` + +Stores value and returns evicted item if cache was full. + +```javascript +const cache = lru(2); +cache.set("a", 1).set("b", 2); + +const evicted = cache.setWithEvicted("c", 3); +console.log(evicted); // { key: 'a', value: 1, expiry: 0 } +console.log(cache.keys()); // ['b', 'c'] +``` + +**Parameters:** + +| Name | Type | Default | Description | +|------|------|---------|-------------| +| `key` | `string` | - | Item key | +| `value` | `*` | - | Item value | +| `resetTtl` | `boolean` | `this.resetTtl` | Reset TTL for this operation | + +**Returns:** `{ key, value, expiry } | null` - Evicted item or null + +--- + +### `values(keys?)` + +Returns values in LRU order. + +```javascript +cache.set("a", 1).set("b", 2).set("c", 3); +console.log(cache.values()); +// [1, 2, 3] + +console.log(cache.values(["c", "a"])); +// [3, 1] - respects LRU order +``` + +**Parameters:** + +| Name | Type | Description | +|------|------|-------------| +| `keys` | `string[]` | Optional specific keys to retrieve | + +**Returns:** `*[]` - Array of values + +--- + +## Evicted Item Shape + +When `setWithEvicted` returns an evicted item: + +```javascript +{ + key: string, // The evicted key + value: *, // The evicted value + expiry: number // Expiration timestamp (0 if no TTL) +} +``` + +--- + +## Method Chaining + +All mutation methods return `this` for chaining: + +```javascript +cache + .set("a", 1) + .set("b", 2) + .set("c", 3) + .delete("a") + .evict(); + +console.log(cache.keys()); // ['c'] +``` From 6d0ea31506a0aa707729dea0784f6b9dc24b8875 Mon Sep 17 00:00:00 2001 From: Jason Mulligan Date: Fri, 20 Mar 2026 20:19:57 -0400 Subject: [PATCH 11/28] Update CODE_STYLE_GUIDE.md with actual coding conventions --- docs/CODE_STYLE_GUIDE.md | 469 +++++++++------------------------------ 1 file changed, 103 insertions(+), 366 deletions(-) diff --git a/docs/CODE_STYLE_GUIDE.md b/docs/CODE_STYLE_GUIDE.md index 15de74b..684941b 100644 --- a/docs/CODE_STYLE_GUIDE.md +++ b/docs/CODE_STYLE_GUIDE.md @@ -1,279 +1,159 @@ # Code Style Guide -This document outlines the coding standards and best practices for the tiny-lru project. Following these guidelines ensures consistency, maintainability, and readability across the codebase. +Coding conventions for tiny-lru source code. -## Table of Contents +## Editor Configuration -- [General Principles](#general-principles) -- [Naming Conventions](#naming-conventions) -- [Code Formatting](#code-formatting) -- [Documentation](#documentation) -- [Functions and Methods](#functions-and-methods) -- [Classes](#classes) -- [Error Handling](#error-handling) -- [Testing](#testing) -- [Security](#security) -- [Performance](#performance) -- [File Organization](#file-organization) +Set your editor to use **tabs** for indentation. -## General Principles +## JavaScript Style -We adhere to the following software engineering principles: - -- **DRY (Don't Repeat Yourself)**: Avoid code duplication -- **KISS (Keep It Simple, Stupid)**: Favor simple solutions over complex ones -- **YAGNI (You Aren't Gonna Need It)**: Don't implement features until they're needed -- **SOLID Principles**: Follow object-oriented design principles -- **OWASP Security Guidelines**: Implement secure coding practices - -## Naming Conventions - -### Variables and Functions -- Use **camelCase** for all variable and function names -- Use descriptive names that clearly indicate purpose +### Formatting ```javascript -// ✅ Good -const userCache = new LRU(100); -const calculateExpiry = (ttl) => Date.now() + ttl; - -// ❌ Bad -const uc = new LRU(100); -const calc = (t) => Date.now() + t; -``` - -### Constants -- Use **UPPER_CASE_SNAKE_CASE** for constants -- Group related constants together - -```javascript -// ✅ Good -const DEFAULT_MAX_SIZE = 1000; -const DEFAULT_TTL = 0; -const CACHE_MISS_PENALTY = 100; - -// ❌ Bad -const defaultMaxSize = 1000; -const default_ttl = 0; -``` - -### Classes -- Use **PascalCase** for class names -- Use descriptive names that indicate the class purpose - -```javascript -// ✅ Good -class LRU { - // implementation +// Tabs for indentation +function example() { + const cache = new LRU(); } -class CacheNode { - // implementation -} +// Double quotes +const name = "tiny-lru"; -// ❌ Bad -class lru { - // implementation -} -``` +// Semicolons required +const result = cache.get("key"); -### Files and Directories -- Use **kebab-case** for file and directory names -- Use descriptive names that indicate content purpose +// K&R braces +if (condition) { + doSomething(); +} else { + doSomethingElse(); +} +// Space before function parens +function myFunction() { } +const arrowFn = () => { }; +const x = function() { }; ``` -src/ - lru.js - cache-utils.js -test/ - integration/ - lru-integration-test.js - unit/ - lru-unit-test.js -``` - -## Code Formatting - -### Indentation -- Use **tabs** for indentation (as per existing codebase) -- Be consistent throughout the project -### Line Length -- Keep lines under **120 characters** when possible -- Break long lines at logical points - -### Spacing -- Use spaces around operators -- Use spaces after commas -- No trailing whitespace +### Comparisons ```javascript -// ✅ Good -const result = a + b * c; -const array = [1, 2, 3, 4]; -const object = { key: value, another: data }; - -// ❌ Bad -const result=a+b*c; -const array=[1,2,3,4]; -const object={key:value,another:data}; +// Use === and !== for comparisons +if (item !== undefined) { } +if (this.first === null) { } ``` -### Semicolons -- Use semicolons consistently throughout the codebase -- Follow the existing project pattern - -### Braces -- Use consistent brace style (K&R style as per existing code) +### Object Creation ```javascript -// ✅ Good -if (condition) { - doSomething(); -} else { - doSomethingElse(); -} +// Use Object.create(null) for hash maps - avoids prototype pollution +this.items = Object.create(null); -// ❌ Bad -if (condition) -{ - doSomething(); -} -else -{ - doSomethingElse(); -} +// Use Array.from() for pre-allocated arrays +const result = Array.from({ length: this.size }); ``` -## Documentation +## JSDoc Comments -### JSDoc Standards -- Use **JSDoc standard** for all function and class documentation -- Include comprehensive descriptions, parameters, return values, and examples +Every exported function and class method must have JSDoc: ```javascript /** - * Retrieves a value from the cache by key. + * Short description of the method. * - * @method get + * @method methodName * @memberof LRU - * @param {string} key - The key to retrieve. - * @returns {*} The value associated with the key, or undefined if not found. + * @param {string} key - Description of parameter. + * @returns {LRU} Description of return value. * @example - * cache.set('key1', 'value1'); - * console.log(cache.get('key1')); // 'value1' - * @see {@link LRU#set} + * cache.set('key', 'value'); + * @see {@link LRU#get} * @since 1.0.0 */ -get(key) { +methodName(key) { // implementation } ``` -### Required JSDoc Tags -- `@param` for all parameters with type and description -- `@returns` for return values with type and description -- `@throws` for exceptions that may be thrown -- `@example` for usage examples -- `@since` for version information -- `@see` for related methods/classes -- `@memberof` for class methods +### JSDoc Tags -### Code Comments -- Use inline comments sparingly and only when code logic is complex -- Write self-documenting code when possible -- Explain **why**, not **what** +- `@method` - Method name +- `@memberof` - Parent class +- `@param` - Parameters with type and description +- `@returns` - Return value with type +- `@example` - Usage example +- `@see` - Related methods +- `@since` - Version introduced +- `@private` - For internal methods + +## Naming ```javascript -// ✅ Good - explains why -if (this.ttl > 0 && item.expiry <= Date.now()) { - // Item has expired, remove it from cache - this.delete(key); -} +// Classes: PascalCase +export class LRU { } -// ❌ Bad - explains what (obvious from code) -// Check if ttl is greater than 0 and item expiry is less than or equal to current time -if (this.ttl > 0 && item.expiry <= Date.now()) { - this.delete(key); -} +// Methods: camelCase +clear() { } +setWithEvicted() { } + +// Variables: camelCase +const maxSize = 1000; +let currentItem = null; + +// Constants: camelCase (not UPPER_SNAKE) +const defaultMax = 1000; ``` -## Functions and Methods +## Method Patterns -### Function Design -- Keep functions small and focused on a single responsibility -- Use pure functions when possible (no side effects) -- Limit function parameters (prefer 3 or fewer) +### Method Chaining -```javascript -// ✅ Good - single responsibility -function isExpired(item, currentTime) { - return item.expiry > 0 && item.expiry <= currentTime; -} +Methods that modify state return `this`: -// ❌ Bad - multiple responsibilities -function processItemAndUpdateCache(item, cache, currentTime) { - if (item.expiry > 0 && item.expiry <= currentTime) { - cache.delete(item.key); - cache.stats.evictions++; - return null; - } - cache.stats.hits++; - return item.value; +```javascript +clear() { + this.size = 0; + return this; } ``` -### Method Chaining -- Return `this` from methods that modify state to enable chaining -- Document chaining capability in JSDoc +### Null Safety + +Always check for null/undefined: ```javascript -/** - * @returns {LRU} The LRU instance for method chaining. - */ -set(key, value) { - // implementation +if (item.prev !== null) { + item.prev.next = item.next; +} + +if (!item) { return this; } ``` -### Parameter Validation -- Validate parameters at function entry -- Throw appropriate errors for invalid inputs -- Use meaningful error messages +### Early Returns + +Use early returns to reduce nesting: ```javascript -function lru(max = 1000, ttl = 0, resetTtl = false) { - if (isNaN(max) || max < 0) { - throw new TypeError("Invalid max value"); - } - - if (isNaN(ttl) || ttl < 0) { - throw new TypeError("Invalid ttl value"); - } - - if (typeof resetTtl !== "boolean") { - throw new TypeError("Invalid resetTtl value"); +get(key) { + const item = this.items[key]; + + if (item === undefined) { + return undefined; } - - return new LRU(max, ttl, resetTtl); + + // Main logic here + return item.value; } ``` -## Classes - -### Class Structure -- Order class members logically: constructor, public methods, private methods -- Use consistent method ordering across similar classes -- Initialize all properties in constructor +## Class Structure ```javascript export class LRU { - /** - * Constructor with full documentation - */ + // Constructor first constructor(max = 0, ttl = 0, resetTtl = false) { - // Initialize all properties this.first = null; this.items = Object.create(null); this.last = null; @@ -283,169 +163,26 @@ export class LRU { this.ttl = ttl; } - // Public methods first - get(key) { /* implementation */ } - - set(key, value) { /* implementation */ } - - // Private methods last (if any) - _internalMethod() { /* implementation */ } + // Public methods + clear() { } + get(key) { } + set(key, value) { } + + // Private methods at end (if any) + moveToEnd(item) { } } ``` -### Property Access -- Use public properties for API surface -- Use private properties (starting with underscore) for internal state -- Avoid getter/setter overhead unless necessary - ## Error Handling -### Error Types -- Use built-in error types when appropriate (`TypeError`, `RangeError`, etc.) -- Create custom error classes for domain-specific errors -- Include helpful error messages +Use TypeError with clear messages: ```javascript -// ✅ Good -if (typeof key !== 'string') { - throw new TypeError(`Expected string key, got ${typeof key}`); -} - -// ❌ Bad -if (typeof key !== 'string') { - throw new Error('Bad key'); +if (isNaN(max) || max < 0) { + throw new TypeError("Invalid max value"); } ``` -### Error Documentation -- Document all errors that functions may throw -- Include error conditions in JSDoc - -```javascript -/** - * @throws {TypeError} When key is not a string. - * @throws {RangeError} When value exceeds maximum size. - */ -``` - -## Testing - -### Test Organization -- **Unit tests** go in `tests/unit/` using node-assert and mocha -- **Integration tests** go in `tests/integration/` using node-assert and mocha -- Follow the same naming conventions as source files - -### Test Structure -- Use descriptive test names that explain the scenario -- Follow Arrange-Act-Assert pattern -- Test both success and failure cases - -```javascript -import assert from 'node:assert'; -import { describe, it } from 'mocha'; -import { LRU } from '../src/lru.js'; - -describe('LRU Cache', () => { - it('should return undefined for non-existent keys', () => { - // Arrange - const cache = new LRU(10); - - // Act - const result = cache.get('nonexistent'); - - // Assert - assert.strictEqual(result, undefined); - }); - - it('should throw TypeError for invalid max value', () => { - // Assert - assert.throws(() => { - new LRU(-1); - }, TypeError, 'Invalid max value'); - }); -}); -``` - -## Security - -### Input Validation -- Validate all external inputs -- Sanitize data before processing -- Use parameterized queries for database operations - -### Memory Safety -- Avoid memory leaks by properly cleaning up references -- Be careful with circular references -- Monitor memory usage in long-running operations - -### OWASP Guidelines -- Follow OWASP security guidelines for all code -- Avoid common vulnerabilities (injection, XSS, etc.) -- Use secure coding practices - -## Performance - -### Algorithmic Efficiency -- Choose appropriate data structures for the use case -- Consider time and space complexity -- Profile code to identify bottlenecks - -### Memory Management -- Reuse objects when possible -- Avoid unnecessary object creation in hot paths -- Use `Object.create(null)` for hash maps without prototype pollution - -```javascript -// ✅ Good - no prototype pollution -this.items = Object.create(null); - -// ❌ Potentially problematic -this.items = {}; -``` - -### Micro-optimizations -- Avoid premature optimization -- Measure before optimizing -- Focus on algorithmic improvements over micro-optimizations - -## File Organization - -### Project Structure -``` -tiny-lru/ -├── src/ # Source code -│ └── lru.js -├── test/ # Test files -│ ├── unit/ # Unit tests -│ └── integration/ # Integration tests -├── types/ # TypeScript definitions -├── docs/ # Documentation -├── benchmarks/ # Performance benchmarks -└── dist/ # Built files -``` - -### Import/Export -- Use ES6 modules (`import`/`export`) -- Use named exports for utilities, default exports for main classes -- Group imports logically - -```javascript -// ✅ Good - grouped imports -import assert from 'node:assert'; -import { describe, it } from 'mocha'; - -import { LRU, lru } from '../src/lru.js'; -import { helper } from './test-utils.js'; - -// ❌ Bad - mixed import order -import { LRU } from '../src/lru.js'; -import assert from 'node:assert'; -import { helper } from './test-utils.js'; -import { describe, it } from 'mocha'; -``` - -## Conclusion - -This style guide ensures consistency and quality across the tiny-lru codebase. When in doubt, refer to existing code patterns and prioritize readability and maintainability over cleverness. +## ESLint Configuration -For questions or suggestions about this style guide, please open an issue in the project repository. \ No newline at end of file +The project uses oxlint. Run `npm run lint` to check code style. From 645897f03b9968565f7919dc1dad793623d1aca9 Mon Sep 17 00:00:00 2001 From: Jason Mulligan Date: Fri, 20 Mar 2026 20:21:24 -0400 Subject: [PATCH 12/28] Update TECHNICAL_DOCUMENTATION.md to reflect actual implementation --- docs/TECHNICAL_DOCUMENTATION.md | 1209 ++++--------------------------- 1 file changed, 161 insertions(+), 1048 deletions(-) diff --git a/docs/TECHNICAL_DOCUMENTATION.md b/docs/TECHNICAL_DOCUMENTATION.md index f60d026..47a982b 100644 --- a/docs/TECHNICAL_DOCUMENTATION.md +++ b/docs/TECHNICAL_DOCUMENTATION.md @@ -1,1130 +1,243 @@ # Technical Documentation -## Overview +Architecture and implementation details for tiny-lru. -The tiny-lru library provides a high-performance, memory-efficient Least Recently Used (LRU) cache implementation with optional Time-To-Live (TTL) support. This document covers the technical architecture, data flow, modern usage patterns, and security considerations for production applications. +## Architecture -## Table of Contents +The LRU cache combines a doubly-linked list with a hash map for O(1) operations. -- [Architecture Overview](#architecture-overview) -- [Data Flow](#data-flow) -- [Core Operations](#core-operations) -- [Mathematical Foundation](#mathematical-foundation) -- [TypeScript Support](#typescript-support) -- [Modern Usage Patterns](#modern-usage-patterns) -- [Security Considerations](#security-considerations) -- [Performance Characteristics](#performance-characteristics) -- [Integration Examples](#integration-examples) -- [Best Practices](#best-practices) -- [Build Configuration and Distribution](#build-configuration-and-distribution) - -## Architecture Overview - -The LRU cache implements a doubly-linked list combined with a hash map for O(1) operations on both insertion and retrieval. - -> **Accessibility Note**: All diagrams use WCAG AA compliant colors with sufficient contrast ratios (>4.5:1) that work on both light and dark backgrounds. Colors are combined with distinct shapes and borders to ensure accessibility for users with color vision deficiencies. - -```mermaid -graph TD - A["LRU Cache Instance"] --> B["Hash Map
items: Object"] - A --> C["Doubly Linked List"] - - B --> D["Key-Value Mapping
O(1) Access"] - C --> E["Node: first"] - C --> F["Node: last"] - - E --> G["prev: null
next: Node
key: string
value: any
expiry: number"] - F --> H["prev: Node
next: null
key: string
value: any
expiry: number"] - - G --> I["Middle Nodes"] - I --> F - - style A fill:#2563eb,stroke:#1e40af,stroke-width:2px,color:#ffffff - style B fill:#7c3aed,stroke:#5b21b6,stroke-width:2px,color:#ffffff - style C fill:#059669,stroke:#047857,stroke-width:2px,color:#ffffff ``` - -### Core Components - -- **Hash Map (`items`)**: Object.create(null) providing O(1) key-based access to cache nodes -- **Doubly Linked List**: Maintains LRU order with `first` and `last` pointers for O(1) insertion/deletion -- **Cache Nodes**: Store key, value, expiry timestamp, and linked list pointers (prev/next) -- **LRU Class Properties**: - - `first`: Pointer to least recently used item - - `last`: Pointer to most recently used item - - `items`: Hash map for O(1) key lookup - - `max`: Maximum cache size (0 = unlimited) - - `size`: Current number of items - - `ttl`: Time-to-live in milliseconds (0 = no expiration) - - `resetTtl`: Whether to reset TTL on access - -## Data Flow - -### Cache Hit Scenario - -```mermaid -sequenceDiagram - participant Client - participant LRU as LRU Cache - participant HashMap as Hash Map - participant LinkedList as Linked List - - Client->>LRU: get(key) - LRU->>HashMap: items[key] - HashMap-->>LRU: node reference - - alt TTL enabled - LRU->>LRU: check item.expiry <= Date.now() - alt expired - LRU->>HashMap: delete items[key] - LRU->>LinkedList: remove node - LRU-->>Client: undefined - else not expired - LRU->>LRU: moveToEnd(item) - O(1) optimization - LRU-->>Client: item.value - end - else no TTL - LRU->>LRU: moveToEnd(item) - O(1) optimization - LRU-->>Client: item.value - end -``` - -### Cache Miss and Eviction Scenario - -```mermaid -sequenceDiagram - participant Client - participant LRU as LRU Cache - participant HashMap as Hash Map - participant LinkedList as Linked List - - Client->>LRU: set(key, value) - LRU->>HashMap: check items[key] - HashMap-->>LRU: undefined (miss) - - alt cache full (size === max) - LRU->>LRU: evict() - remove this.first - LRU->>HashMap: delete items[first.key] - LRU->>LinkedList: update first pointer - Note over LRU: LRU eviction complete - end - - LRU->>HashMap: items[key] = new item - LRU->>LinkedList: set item.prev = this.last - LRU->>LinkedList: update this.last = item - LRU->>LRU: increment size - LRU-->>Client: this (chainable) -``` - -## Core Operations - -### Time Complexity - -| Operation | Average Case | Worst Case | Space | Description | -|-----------|--------------|------------|-------|-------------| -| `get(key)` | O(1) | O(1) | O(1) | Retrieve value and move to end | -| `set(key, value)` | O(1) | O(1) | O(1) | Store value, evict if needed | -| `setWithEvicted(key, value)` | O(1) | O(1) | O(1) | Store value, return evicted item | -| `delete(key)` | O(1) | O(1) | O(1) | Remove item from cache | -| `has(key)` | O(1) | O(1) | O(1) | Check key existence | -| `clear()` | O(1) | O(1) | O(1) | Reset all pointers | -| `evict()` | O(1) | O(1) | O(1) | Remove least recently used item | -| `expiresAt(key)` | O(1) | O(1) | O(1) | Get expiration timestamp | -| `moveToEnd(item)` | O(1) | O(1) | O(1) | Internal: optimize LRU positioning | -| `keys()` | O(n) | O(n) | O(n) | Array of all keys in LRU order | -| `values(keys?)` | O(n) | O(n) | O(n) | Array of values for specified keys | -| `entries(keys?)` | O(n) | O(n) | O(n) | Array of [key, value] pairs | - -### Memory Usage - -- **Per Node**: ~120 bytes (key + value + pointers + metadata) -- **Base Overhead**: ~200 bytes (class instance + hash map) -- **Total**: `base + (nodes × 120)` bytes approximately - -## Mathematical Foundation - -### Core Operations - -The LRU cache maintains a doubly-linked list $L$ and a hash table $H$ for O(1) operations: - -**Data Structure:** -- $L = (first, last, size)$ - Doubly-linked list with head/tail pointers -- $H: K \rightarrow \{key: K, value: V, prev: Object, next: Object, expiry: \mathbb{N}_0\}$ - Hash table mapping keys to item objects -- $max \in \mathbb{N}_0$ - Maximum cache size (0 = unlimited) -- $ttl \in \mathbb{N}_0$ - Time-to-live in milliseconds -- $resetTtl \in \{\text{true}, \text{false}\}$ - Whether to reset TTL on set() operations - -**Core Methods:** - -**Note:** The mathematical notation uses `create(k, v)` to represent the item creation logic that is inline in the actual implementation. - -#### Set Operation: $set(k, v, bypass = false, resetTtl = resetTtl) \rightarrow \text{LRU}$ -$$\begin{align} -set(k, v, bypass, resetTtl) &= \begin{cases} -update(k, v, bypass, resetTtl) & \text{if } k \in H \\ -insert(k, v) & \text{if } k \notin H -\end{cases} \\ -update(k, v, bypass, resetTtl) &= H[k].value \leftarrow v \land moveToEnd(H[k]) \\ -& \quad \land \begin{cases} -H[k].expiry \leftarrow t_{now} + ttl & \text{if } bypass = false \land resetTtl = true \land ttl > 0 \\ -\text{no-op} & \text{otherwise} -\end{cases} \\ -insert(k, v) &= \begin{cases} -evict() \land create(k, v) & \text{if } max > 0 \land size = max \\ -create(k, v) & \text{otherwise} -\end{cases} \\ -create(k, v) &= H[k] \leftarrow \{key: k, value: v, prev: last, next: null, expiry: t_{now} + ttl\} \\ -& \quad \land last \leftarrow H[k] \land size \leftarrow size + 1 \\ -& \quad \land \begin{cases} -first \leftarrow H[k] & \text{if } size = 1 \\ -last.next \leftarrow H[k] & \text{otherwise} -\end{cases} -\end{align}$$ - -**Time Complexity:** $O(1)$ amortized - -#### Set With Evicted Operation: $setWithEvicted(k, v, resetTtl = resetTtl) \rightarrow \{key: K, value: V, expiry: \mathbb{N}_0, prev: Object, next: Object\} \cup \{\bot\}$ -$$\begin{align} -setWithEvicted(k, v, resetTtl) &= \begin{cases} -set(k, v, true, resetTtl) \land \bot & \text{if } k \in H \\ -evicted \land create(k, v) & \text{if } k \notin H \land max > 0 \land size = max \\ -\bot \land create(k, v) & \text{if } k \notin H \land (max = 0 \lor size < max) -\end{cases} \\ -\text{where } evicted &= \begin{cases} -\{...this.first\} & \text{if } size > 0 \\ -\bot & \text{otherwise} -\end{cases} -\end{align}$$ - -**Note:** `setWithEvicted()` always calls `set()` with `bypass = true`, which means TTL is never reset during `setWithEvicted()` operations, regardless of the `resetTtl` parameter. - -**Time Complexity:** $O(1)$ amortized - -#### Get Operation: $get(k) \rightarrow V \cup \{\bot\}$ -$$\begin{align} -get(k) &= \begin{cases} -cleanup(k) \land moveToEnd(H[k]) \land H[k].value & \text{if } k \in H \land (ttl = 0 \lor H[k].expiry > t_{now}) \\ -\bot & \text{otherwise} -\end{cases} -\end{align}$$ - -**Note:** `get()` operations never reset TTL, regardless of the `resetTtl` setting. - -**Time Complexity:** $O(1)$ - -#### Delete Operation: $delete(k) \rightarrow \text{LRU}$ -$$\begin{align} -delete(k) &= \begin{cases} -removeFromList(H[k]) \land H \setminus \{k\} \land size \leftarrow size - 1 & \text{if } k \in H \\ -\text{no-op} & \text{otherwise} -\end{cases} -\end{align}$$ - -**Time Complexity:** $O(1)$ - -#### Move to End: $moveToEnd(item)$ -$$\begin{align} -moveToEnd(item) &= \begin{cases} -\text{no-op} & \text{if } item = last \\ -removeFromList(item) \land appendToList(item) & \text{otherwise} -\end{cases} -\end{align}$$ - -**Time Complexity:** $O(1)$ - -### Eviction Policy - -**LRU Eviction:** When $max > 0 \land size = max$ and inserting a new item: - -$$evict(bypass = false) = \begin{cases} -first \leftarrow first.next \land first.prev \leftarrow null \land H \setminus \{first.key\} \land size \leftarrow size - 1 & \text{if } (bypass \lor size > 0) \\ -\text{no-op} & \text{otherwise} -\end{cases}$$ - -### TTL Expiration - -**Expiration Check:** For any operation accessing key $k$: - -$$isExpired(k) = ttl > 0 \land H[k].expiry \leq t_{now}$$ - -**Automatic Cleanup:** Expired items are removed on access: - -$$cleanup(k) = \begin{cases} -delete(k) & \text{if } isExpired(k) \\ -\text{no-op} & \text{otherwise} -\end{cases}$$ - -**TTL Reset Behavior:** -- TTL is only reset during `set()` operations when `resetTtl = true` and `bypass = false` -- `get()` operations never reset TTL, regardless of the `resetTtl` setting -- `setWithEvicted()` operations never reset TTL because they always call `set()` with `bypass = true` - -### Space Complexity - -- **Worst Case:** $O(n)$ where $n = \min(size, max)$ -- **Hash Table:** $O(n)$ for key-value storage -- **Linked List:** $O(n)$ for LRU ordering -- **Per Item Overhead:** Constant space for prev/next pointers and metadata - -### Invariants - -1. **Size Constraint:** $0 \leq size \leq max$ (when $max > 0$) -2. **List Consistency:** $first \neq null \iff last \neq null \iff size > 0$ -3. **Hash Consistency:** $|H| = size$ -4. **LRU Order:** Items in list are ordered from least to most recently used -5. **TTL Validity:** $ttl = 0 \lor \forall k \in H: H[k].expiry > t_{now}$ -6. **TTL Reset Invariant:** TTL is only reset during `set()` operations when `bypass = false`, never during `get()` or `setWithEvicted()` operations - -## TypeScript Support - -The library includes comprehensive TypeScript definitions with generic type support for type-safe value storage. - -### Interface Definitions - -```typescript -// Factory function with optional generic type -export function lru(max?: number, ttl?: number, resetTtl?: boolean): LRU; - -// Main LRU class with generic value type -export class LRU { - constructor(max?: number, ttl?: number, resetTtl?: boolean); - - // Instance properties - first: LRUItem | null; - items: Record>; - last: LRUItem | null; - max: number; - resetTtl: boolean; - size: number; - ttl: number; - - // Core methods - clear(): this; - delete(key: any): this; - entries(keys?: any[]): [any, T][]; - evict(bypass?: boolean): this; - expiresAt(key: any): number | undefined; - get(key: any): T | undefined; - has(key: any): boolean; - keys(): any[]; - set(key: any, value: T, bypass?: boolean, resetTtl?: boolean): this; - setWithEvicted(key: any, value: T, resetTtl?: boolean): LRUItem | null; - values(keys?: any[]): T[]; -} - -// Internal item structure -interface LRUItem { - expiry: number; - key: any; - prev: LRUItem | null; - next: LRUItem | null; - value: T; -} +LRU Cache +├── items: HashMap (Object.create(null)) → O(1) key lookup +├── first: Node (least recently used) +├── last: Node (most recently used) +└── Linked list via prev/next pointers ``` -### TypeScript Usage Examples - -```typescript -import { LRU, lru } from 'tiny-lru'; - -// Type-safe cache for user objects -interface User { - id: number; - name: string; - email: string; -} - -const userCache = new LRU(1000, 300000); // 1000 users, 5 min TTL -userCache.set('user_123', { id: 123, name: 'John', email: 'john@example.com' }); -const user: User | undefined = userCache.get('user_123'); // Fully typed +### Node Structure -// Type-safe cache for API responses -interface APIResponse { - data: T; - status: number; - timestamp: number; +```javascript +{ + key: string, + value: *, + expiry: number, // timestamp or 0 + prev: Node | null, + next: Node | null } - -const apiCache = lru>(500, 600000); // 10 min TTL -apiCache.set('endpoint_abc', { - data: { results: [] }, - status: 200, - timestamp: Date.now() -}); - -// String cache with factory function -const stringCache = lru(100); -stringCache.set('key1', 'value1'); -const value: string | undefined = stringCache.get('key1'); ``` -## Modern Usage Patterns - -### 1. LLM Response Caching - -Cache expensive AI model responses with content-based keys and reasonable TTLs. +## Data Structures ```javascript -import { LRU } from 'tiny-lru'; - -class LLMCache { - constructor() { - // Cache up to 1000 responses for 1 hour - this.cache = new LRU(1000, 3600000); // 1 hour TTL - } - - /** - * Generate cache key for LLM request - * @param {string} model - Model identifier - * @param {string} prompt - User prompt - * @param {object} params - Model parameters - */ - generateKey(model, prompt, params = {}) { - const paramsHash = this.hashObject(params); - const promptHash = this.hashString(prompt); - return `llm:${model}:${promptHash}:${paramsHash}`; - } - - async getResponse(model, prompt, params = {}) { - const key = this.generateKey(model, prompt, params); - - // Check cache first - const cached = this.cache.get(key); - if (cached) { - return { ...cached, fromCache: true }; - } - - // Make expensive API call - const response = await this.callLLMAPI(model, prompt, params); - - // Cache the response - this.cache.set(key, { - response: response.text, - tokens: response.tokens, - timestamp: Date.now() - }); - - return { ...response, fromCache: false }; - } - - hashString(str) { - // Simple hash function for demonstration - let hash = 0; - for (let i = 0; i < str.length; i++) { - const char = str.charCodeAt(i); - hash = ((hash << 5) - hash) + char; - hash = hash & hash; // Convert to 32-bit integer - } - return Math.abs(hash).toString(36); - } - - hashObject(obj) { - return this.hashString(JSON.stringify(obj, Object.keys(obj).sort())); - } +export class LRU { + constructor(max = 0, ttl = 0, resetTtl = false) { + this.first = null; // Least recently used + this.items = Object.create(null); // Hash map + this.last = null; // Most recently used + this.max = max; // 0 = unlimited + this.resetTtl = resetTtl; // Reset TTL on set() + this.size = 0; // Current count + this.ttl = ttl; // Milliseconds, 0 = no expiry + } } ``` -### 2. API Response Caching with Rate Limiting - -Cache external API responses with different TTLs based on data sensitivity. +## Time Complexity -```javascript -import { LRU } from 'tiny-lru'; +| Operation | Time | Notes | +|-----------|------|-------| +| `get` | O(1) | Checks TTL, moves to end | +| `set` | O(1) | Evicts if full | +| `setWithEvicted` | O(1) | Returns evicted item | +| `delete` | O(1) | Removes from list | +| `has` | O(1) | Checks TTL | +| `evict` | O(1) | Removes first | +| `clear` | O(1) | Resets pointers | +| `keys/values/entries` | O(n) | Iterates list | +| `expiresAt` | O(1) | Direct lookup | -class APICache { - constructor() { - this.caches = { - // Fast-changing data: 5 minutes - realtime: new LRU(500, 300000), - // Moderate data: 30 minutes - standard: new LRU(1000, 1800000), - // Stable data: 24 hours - stable: new LRU(2000, 86400000) - }; - } - - async fetchUserProfile(userId, domain = 'users') { - const key = `${domain}:profile:${userId}`; - const cache = this.caches.standard; - - const cached = cache.get(key); - if (cached) { - return cached; - } - - const profile = await fetch(`/api/users/${userId}`).then(r => r.json()); - - // Use setWithEvicted to track what gets evicted for analytics - const evicted = cache.setWithEvicted(key, profile); - if (evicted) { - console.log(`Evicted user profile: ${evicted.key}`); - } - - return profile; - } - - async fetchRealtimeData(symbol, domain = 'market') { - const key = `${domain}:price:${symbol}`; - const cache = this.caches.realtime; - - const cached = cache.get(key); - if (cached) { - return cached; - } - - const data = await fetch(`/api/market/${symbol}`).then(r => r.json()); - cache.set(key, data); - - return data; - } -} -``` +## TTL Behavior -### 3. Database Query Result Caching +### Expiration -Cache expensive database queries with intelligent cache invalidation. +Items expire when `Date.now() >= item.expiry`. Expired items are cleaned up on `get()` and `has()`. ```javascript -import { LRU } from 'tiny-lru'; - -class QueryCache { - constructor() { - // No TTL - manual invalidation - this.cache = new LRU(10000); - this.dependencyMap = new Map(); // Track query dependencies - } - - async query(sql, params = [], dependencies = []) { - const key = this.generateQueryKey(sql, params); - - const cached = this.cache.get(key); - if (cached) { - return cached; - } - - const result = await this.executeQuery(sql, params); - this.cache.set(key, result); - - // Track dependencies for invalidation - this.trackDependencies(key, dependencies); - - return result; - } - - generateQueryKey(sql, params) { - const sqlHash = this.hashString(sql.replace(/\s+/g, ' ').trim()); - const paramsHash = this.hashString(JSON.stringify(params)); - return `query:${sqlHash}:${paramsHash}`; - } - - // Invalidate cache when specific tables change - invalidateByTable(tableName) { - const keysToDelete = []; - - for (const [key, deps] of this.dependencyMap.entries()) { - if (deps.includes(tableName)) { - keysToDelete.push(key); - } - } - - keysToDelete.forEach(key => { - this.cache.delete(key); - this.dependencyMap.delete(key); - }); - } - - // Get cache statistics using modern API methods - getCacheStats() { - const allKeys = this.cache.keys(); - const allEntries = this.cache.entries(); // Gets [key, value] pairs - const dependentQueries = this.cache.values( - allKeys.filter(key => this.dependencyMap.has(key)) - ); - - return { - totalQueries: this.cache.size, - queryKeys: allKeys, - dependentQueryCount: dependentQueries.length, - lruOrder: allEntries.map(([key, _]) => key) // Least to most recent - }; - } - - trackDependencies(key, dependencies) { - if (dependencies.length > 0) { - this.dependencyMap.set(key, dependencies); - } - } +// TTL check in get() +if (this.ttl > 0 && item.expiry <= Date.now()) { + this.delete(key); + return undefined; } ``` -### 4. Session and Authentication Caching +### TTL Reset -Cache user sessions and authentication tokens with proper security. +TTL only resets during `set()` when both conditions are true: +- `resetTtl = true` (constructor or method parameter) +- `bypass = false` (internal, not exposed) ```javascript -import { LRU } from 'tiny-lru'; - -class AuthCache { - constructor() { - // Session cache: 30 minutes with TTL reset on access - this.sessions = new LRU(10000, 1800000, true); - // Token validation cache: 5 minutes, no reset - this.tokens = new LRU(5000, 300000, false); - // Permission cache: 15 minutes - this.permissions = new LRU(5000, 900000); - } - - cacheSession(sessionId, userData, domain = 'app') { - const key = `${domain}:session:${sessionId}`; - this.sessions.set(key, { - userId: userData.userId, - permissions: userData.permissions, - loginTime: Date.now(), - lastActivity: Date.now() - }); - - // Log when this session will expire - const expiryTime = this.sessions.expiresAt(key); - if (expiryTime) { - console.log(`Session ${sessionId} expires at: ${new Date(expiryTime)}`); - } - } - - getSession(sessionId, domain = 'app') { - const key = `${domain}:session:${sessionId}`; - return this.sessions.get(key); - } - - cacheTokenValidation(tokenHash, isValid, userId = null) { - const key = `auth:token:${tokenHash}`; - this.tokens.set(key, { isValid, userId, validatedAt: Date.now() }); - } - - isTokenValid(tokenHash) { - const key = `auth:token:${tokenHash}`; - const cached = this.tokens.get(key); - return cached?.isValid || false; - } +// In set() +if (bypass === false && resetTtl) { + item.expiry = this.ttl > 0 ? Date.now() + this.ttl : this.ttl; } ``` -## Security Considerations +Important: `get()` never resets TTL, and `setWithEvicted()` always passes `bypass=true`, so TTL is never reset during `setWithEvicted()`. -### Multi-Domain Key Convention - -Implement a hierarchical key naming convention to prevent cross-domain data leakage and improve operational security. - -#### Key Format Specification - -``` -{domain}:{service}:{resource}:{identifier}[:{version}] -``` - -#### Domain Categories - -```javascript -const DOMAIN_PREFIXES = { - // User-related data - USER: 'usr', - // Authentication & authorization - AUTH: 'auth', - // External API responses - API: 'api', - // Database query results - DB: 'db', - // Application logic - APP: 'app', - // System/infrastructure - SYS: 'sys', - // Analytics & metrics - ANALYTICS: 'analytics', - // Machine learning / AI - ML: 'ml' -}; - -const SERVICE_PREFIXES = { - // Authentication services - LOGIN: 'login', - LOGOUT: 'logout', - REFRESH: 'refresh', - // Data services - PROFILE: 'profile', - SETTINGS: 'settings', - // External integrations - PAYMENT: 'payment', - EMAIL: 'email', - SMS: 'sms' -}; -``` +## Core Operations -#### Implementation Example +### get(key) ```javascript -class SecureKeyManager { - constructor(domain, service) { - this.domain = domain; - this.service = service; - this.separator = ':'; - } - - generateKey(resource, identifier, version = null) { - const parts = [this.domain, this.service, resource, identifier]; - if (version) parts.push(version); - - return parts.join(this.separator); - } - - parseKey(key) { - const parts = key.split(this.separator); - return { - domain: parts[0], - service: parts[1], - resource: parts[2], - identifier: parts[3], - version: parts[4] || null - }; - } - - // Validate key follows security convention - validateKey(key) { - const parts = key.split(this.separator); - - if (parts.length < 4 || parts.length > 5) { - throw new Error('Invalid key format: must have 4-5 parts'); - } - - if (!Object.values(DOMAIN_PREFIXES).includes(parts[0])) { - throw new Error(`Invalid domain prefix: ${parts[0]}`); - } - - return true; +get(key) { + const item = this.items[key]; + + if (item !== undefined) { + if (this.ttl > 0 && item.expiry <= Date.now()) { + this.delete(key); + return undefined; } + this.moveToEnd(item); + return item.value; + } + + return undefined; } - -// Usage examples -const authKeys = new SecureKeyManager(DOMAIN_PREFIXES.AUTH, SERVICE_PREFIXES.LOGIN); -const userKeys = new SecureKeyManager(DOMAIN_PREFIXES.USER, SERVICE_PREFIXES.PROFILE); -const mlKeys = new SecureKeyManager(DOMAIN_PREFIXES.ML, 'llm'); - -// Generate secure keys -const sessionKey = authKeys.generateKey('session', 'abc123def456'); -// Result: "auth:login:session:abc123def456" - -const profileKey = userKeys.generateKey('data', '12345', 'v2'); -// Result: "usr:profile:data:12345:v2" - -const llmKey = mlKeys.generateKey('response', 'gpt4-prompt-hash'); -// Result: "ml:llm:response:gpt4-prompt-hash" ``` -### Cache Isolation +### set(key, value, bypass, resetTtl) ```javascript -class IsolatedCacheManager { - constructor() { - this.caches = new Map(); - } - - getCache(domain, service, maxSize = 1000, ttl = 0) { - const cacheKey = `${domain}:${service}`; - - if (!this.caches.has(cacheKey)) { - this.caches.set(cacheKey, new LRU(maxSize, ttl)); - } - - return this.caches.get(cacheKey); - } - - // Secure method to access only your domain's cache - accessCache(domain, service, operation, ...args) { - if (!this.isAuthorized(domain, service)) { - throw new Error('Unauthorized cache access'); - } - - const cache = this.getCache(domain, service); - return cache[operation](...args); - } - - isAuthorized(domain, service) { - // Implement your authorization logic - return true; // Simplified for example - } - - // Clear caches by domain for security incidents - clearDomain(domain) { - for (const [key, cache] of this.caches.entries()) { - if (key.startsWith(`${domain}:`)) { - cache.clear(); - } - } +set(key, value, bypass = false, resetTtl = this.resetTtl) { + let item = this.items[key]; + + if (bypass || item !== undefined) { + item.value = value; + if (bypass === false && resetTtl) { + item.expiry = this.ttl > 0 ? Date.now() + this.ttl : this.ttl; + } + this.moveToEnd(item); + } else { + if (this.max > 0 && this.size === this.max) { + this.evict(true); + } + item = this.items[key] = { + expiry: this.ttl > 0 ? Date.now() + this.ttl : this.ttl, + key, + prev: this.last, + next: null, + value + }; + if (++this.size === 1) { + this.first = item; + } else { + this.last.next = item; } + this.last = item; + } + + return this; } ``` -## Performance Characteristics - -### Benchmarking Setup +### moveToEnd(item) ```javascript -// Performance testing setup -import { LRU } from 'tiny-lru'; -import { performance } from 'perf_hooks'; - -class PerformanceTester { - constructor() { - this.cache = new LRU(10000); - } - - async benchmarkOperations(iterations = 100000) { - const results = {}; - - // Benchmark set operations - const setStart = performance.now(); - for (let i = 0; i < iterations; i++) { - this.cache.set(`key_${i}`, `value_${i}`); - } - const setEnd = performance.now(); - results.setOpsPerSecond = iterations / ((setEnd - setStart) / 1000); - - // Benchmark get operations - const getStart = performance.now(); - for (let i = 0; i < iterations; i++) { - this.cache.get(`key_${i % 5000}`); // Mix hits and misses - } - const getEnd = performance.now(); - results.getOpsPerSecond = iterations / ((getEnd - getStart) / 1000); - - return results; - } +moveToEnd(item) { + if (this.last === item) return; + + if (item.prev !== null) item.prev.next = item.next; + if (item.next !== null) item.next.prev = item.prev; + if (this.first === item) this.first = item.next; + + item.prev = this.last; + item.next = null; + if (this.last !== null) this.last.next = item; + this.last = item; + if (this.first === null) this.first = item; } ``` -### Memory Usage Patterns - -```mermaid -graph LR - A["Memory Usage"] --> B["Linear Growth"] - B --> C["Until Max Size"] - C --> D["Constant Memory"] - D --> E["With Eviction"] - - F["GC Pressure"] --> G["Low"] - F --> H["Object Reuse"] - F --> I["Minimal Allocation"] - - style A fill:#2563eb,stroke:#1e40af,stroke-width:2px,color:#ffffff - style F fill:#ea580c,stroke:#c2410c,stroke-width:2px,color:#ffffff -``` +## Mathematical Specification -## Integration Examples +### Set Operation -### Express.js Middleware - -```javascript -import { LRU } from 'tiny-lru'; - -function createCacheMiddleware(options = {}) { - const cache = new LRU( - options.maxSize || 1000, - options.ttl || 300000 // 5 minutes default - ); - - return (req, res, next) => { - // Generate cache key from request - const key = `http:${req.method}:${req.path}:${JSON.stringify(req.query)}`; - - // Check cache - const cached = cache.get(key); - if (cached) { - res.set(cached.headers); - return res.status(cached.status).json(cached.data); - } - - // Intercept response - const originalSend = res.json; - res.json = function(data) { - // Cache successful responses - if (res.statusCode < 400) { - cache.set(key, { - status: res.statusCode, - headers: res.getHeaders(), - data: data - }); - } - - return originalSend.call(this, data); - }; - - next(); - }; -} - -// Usage -app.use('/api/users', createCacheMiddleware({ ttl: 600000 })); // 10 minutes ``` - -### React Cache Hook - -```javascript -import { useMemo, useRef } from 'react'; -import { LRU } from 'tiny-lru'; - -function useCache(maxSize = 100, ttl = 300000) { - const cache = useRef(null); - - if (!cache.current) { - cache.current = new LRU(maxSize, ttl); - } - - const memoizedCache = useMemo(() => ({ - get: (key) => cache.current.get(key), - set: (key, value) => cache.current.set(key, value), - delete: (key) => cache.current.delete(key), - clear: () => cache.current.clear(), - has: (key) => cache.current.has(key) - }), []); - - return memoizedCache; -} - -// Usage in component -function UserProfile({ userId }) { - const cache = useCache(50, 600000); // 10 minutes - const [profile, setProfile] = useState(null); - - useEffect(() => { - const cacheKey = `usr:profile:data:${userId}`; - const cached = cache.get(cacheKey); - - if (cached) { - setProfile(cached); - } else { - fetchUserProfile(userId).then(data => { - cache.set(cacheKey, data); - setProfile(data); - }); - } - }, [userId, cache]); - - return
{/* render profile */}
; -} +set(k, v) → + if k ∈ H: update value, optionally reset TTL, moveToEnd + else: evict if full, create node at end ``` -## Best Practices - -### 1. Cache Sizing Strategy +### Get Operation -```mermaid -flowchart TD - A["Determine Cache Size"] --> B{"Memory Available?"} - B -->|Limited| C["Conservative Sizing
~1000 items"] - B -->|Abundant| D["Aggressive Sizing
~10000+ items"] - - C --> E["Monitor Hit Rate"] - D --> E - - E --> F{"Hit Rate < 80%?"} - F -->|Yes| G["Increase Size
or Adjust TTL"] - F -->|No| H["Optimize Keys
or Logic"] - - G --> I["Re-evaluate"] - H --> I - - style A fill:#2563eb,stroke:#1e40af,stroke-width:2px,color:#ffffff - style I fill:#059669,stroke:#047857,stroke-width:2px,color:#ffffff - style B fill:#7c3aed,stroke:#5b21b6,stroke-width:2px,color:#ffffff - style F fill:#7c3aed,stroke:#5b21b6,stroke-width:2px,color:#ffffff ``` - -### 2. TTL Selection Guidelines - -| Data Type | Recommended TTL | Rationale | -|-----------|----------------|-----------| -| User Sessions | 30-60 minutes | Balance security and UX | -| API Responses | 5-30 minutes | Depends on data freshness needs | -| Database Queries | 15-60 minutes | Based on update frequency | -| LLM Responses | 1-24 hours | Expensive to regenerate | -| Static Content | 24+ hours | Rarely changes | - -### 3. Error Handling - -```javascript -class RobustCache { - constructor(maxSize, ttl) { - try { - this.cache = new LRU(maxSize, ttl); - } catch (error) { - console.error('Cache initialization failed:', error); - this.cache = null; - } - } - - safeGet(key) { - try { - return this.cache?.get(key); - } catch (error) { - console.error('Cache get failed:', error); - return undefined; - } - } - - safeSet(key, value) { - try { - return this.cache?.set(key, value); - } catch (error) { - console.error('Cache set failed:', error); - return false; - } - } -} +get(k) → + if k ∉ H: undefined + else if expired: delete(k), undefined + else: moveToEnd, return value ``` -### 4. Monitoring and Metrics +### Eviction Policy -```javascript -class MonitoredCache { - constructor(maxSize, ttl) { - this.cache = new LRU(maxSize, ttl); - this.metrics = { - hits: 0, - misses: 0, - sets: 0, - deletes: 0, - evictions: 0 - }; - } - - get(key) { - const value = this.cache.get(key); - this.metrics[value !== undefined ? 'hits' : 'misses']++; - return value; - } - - set(key, value) { - const hadKey = this.cache.has(key); - const wasAtCapacity = this.cache.size >= this.cache.max; - - const result = this.cache.set(key, value); - - this.metrics.sets++; - if (!hadKey && wasAtCapacity && this.cache.max > 0) { - this.metrics.evictions++; - } - - return result; - } - - getHitRate() { - const total = this.metrics.hits + this.metrics.misses; - return total > 0 ? this.metrics.hits / total : 0; - } - - getMetrics() { - return { - ...this.metrics, - hitRate: this.getHitRate(), - size: this.cache.size, - maxSize: this.cache.max - }; - } -} +``` +evict() → + if size > 0: + delete first.key from H + first = first.next + if size becomes 0: last = null + else: first.prev = null ``` -## Build Configuration and Distribution - -The library uses Rollup for building and distributing multiple module formats to support different JavaScript environments. +## Evicted Item Shape -### Build Process +`setWithEvicted()` returns: ```javascript -// rollup.config.js -export default [{ - input: "./src/lru.js", - output: [ - // CommonJS for Node.js - { format: "cjs", file: "dist/tiny-lru.cjs" }, - // ES Modules for modern bundlers - { format: "esm", file: "dist/tiny-lru.js" }, - // Minified ES Modules - { format: "esm", file: "dist/tiny-lru.min.js", plugins: [terser()] }, - // UMD for browsers - { format: "umd", file: "dist/tiny-lru.umd.js", name: "lru" }, - // Minified UMD - { format: "umd", file: "dist/tiny-lru.umd.min.js", name: "lru", plugins: [terser()] } - ] -}]; -``` - -### Package Exports - -```json { - "source": "src/lru.js", - "main": "dist/tiny-lru.cjs", - "exports": { - "types": "./types/lru.d.ts", - "import": "./dist/tiny-lru.js", - "require": "./dist/tiny-lru.cjs" - }, - "type": "module", - "types": "types/lru.d.ts" + key: string, + value: *, + expiry: number } ``` -### Available Formats - -- **ESM**: `dist/tiny-lru.js` - ES Modules for modern bundlers -- **CommonJS**: `dist/tiny-lru.cjs` - Node.js compatible format -- **UMD**: `dist/tiny-lru.umd.js` - Universal format for browsers -- **Minified**: All formats available with `.min.js` extension -- **TypeScript**: `types/lru.d.ts` - Complete type definitions +Not the full node with `prev`/`next` pointers. -### Development Commands +## Space Complexity -```bash -# Build all distribution formats -npm run build - -# Run tests with coverage -npm test +- O(n) where n = min(size, max) +- Each item: key + value + expiry + 2 pointers +- Hash map overhead for object -# Lint code -npm run lint +## Invariants -# Run benchmarks -npm run benchmark:all -``` +1. `first === null` iff `last === null` iff `size === 0` +2. `|items| === size` +3. List traversal from `first` reaches `last` in O(n) +4. `has()` returns false for expired items +5. `get()` cleans up expired items -### File Structure +## File Structure ``` tiny-lru/ -├── src/ -│ └── lru.js # Source implementation -├── types/ -│ └── lru.d.ts # TypeScript definitions -├── dist/ # Built distributions (generated) -│ ├── tiny-lru.js # ES Modules -│ ├── tiny-lru.cjs # CommonJS -│ ├── tiny-lru.min.js # Minified ESM -│ ├── tiny-lru.umd.js # UMD -│ └── tiny-lru.umd.min.js # Minified UMD -├── tests/ -│ ├── unit/ # Unit tests with mocha -│ └── integration/ # Integration tests -├── benchmarks/ # Performance benchmarks -└── docs/ # Documentation +├── src/lru.js # Implementation (~500 lines) +├── types/lru.d.ts # TypeScript definitions +├── tests/unit/lru.js # Node test runner tests +├── docs/ +│ ├── API.md # API reference +│ ├── CODE_STYLE_GUIDE.md +│ └── TECHNICAL_DOCUMENTATION.md +├── dist/ # Built files +├── benchmarks/ # Performance tests +└── package.json ``` -## Conclusion +## Testing -The tiny-lru library provides a robust foundation for caching in modern applications. By following these patterns, security guidelines, and best practices, you can build efficient, secure, and maintainable caching solutions for contemporary use cases including AI/ML applications, API gateways, and high-performance web services. +```bash +npm test # Run lint and tests +node --test tests/**/*.js # Run tests only +``` -Remember to: -- Use proper key namespacing for security -- Monitor cache performance and hit rates -- Implement appropriate TTL strategies -- Handle errors gracefully -- Consider memory constraints in your sizing decisions -- Choose the appropriate module format for your environment -- Leverage TypeScript support for type safety +Tests use Node's native test runner (`node:test`) with `node:assert`. From c8d04baed03aa02ab7c7e6f8f3e891d951c8cf93 Mon Sep 17 00:00:00 2001 From: Jason Mulligan Date: Fri, 20 Mar 2026 20:22:38 -0400 Subject: [PATCH 13/28] Revert TECHNICAL_DOCUMENTATION.md changes --- docs/TECHNICAL_DOCUMENTATION.md | 1209 +++++++++++++++++++++++++++---- 1 file changed, 1048 insertions(+), 161 deletions(-) diff --git a/docs/TECHNICAL_DOCUMENTATION.md b/docs/TECHNICAL_DOCUMENTATION.md index 47a982b..f60d026 100644 --- a/docs/TECHNICAL_DOCUMENTATION.md +++ b/docs/TECHNICAL_DOCUMENTATION.md @@ -1,243 +1,1130 @@ # Technical Documentation -Architecture and implementation details for tiny-lru. +## Overview -## Architecture +The tiny-lru library provides a high-performance, memory-efficient Least Recently Used (LRU) cache implementation with optional Time-To-Live (TTL) support. This document covers the technical architecture, data flow, modern usage patterns, and security considerations for production applications. -The LRU cache combines a doubly-linked list with a hash map for O(1) operations. +## Table of Contents +- [Architecture Overview](#architecture-overview) +- [Data Flow](#data-flow) +- [Core Operations](#core-operations) +- [Mathematical Foundation](#mathematical-foundation) +- [TypeScript Support](#typescript-support) +- [Modern Usage Patterns](#modern-usage-patterns) +- [Security Considerations](#security-considerations) +- [Performance Characteristics](#performance-characteristics) +- [Integration Examples](#integration-examples) +- [Best Practices](#best-practices) +- [Build Configuration and Distribution](#build-configuration-and-distribution) + +## Architecture Overview + +The LRU cache implements a doubly-linked list combined with a hash map for O(1) operations on both insertion and retrieval. + +> **Accessibility Note**: All diagrams use WCAG AA compliant colors with sufficient contrast ratios (>4.5:1) that work on both light and dark backgrounds. Colors are combined with distinct shapes and borders to ensure accessibility for users with color vision deficiencies. + +```mermaid +graph TD + A["LRU Cache Instance"] --> B["Hash Map
items: Object"] + A --> C["Doubly Linked List"] + + B --> D["Key-Value Mapping
O(1) Access"] + C --> E["Node: first"] + C --> F["Node: last"] + + E --> G["prev: null
next: Node
key: string
value: any
expiry: number"] + F --> H["prev: Node
next: null
key: string
value: any
expiry: number"] + + G --> I["Middle Nodes"] + I --> F + + style A fill:#2563eb,stroke:#1e40af,stroke-width:2px,color:#ffffff + style B fill:#7c3aed,stroke:#5b21b6,stroke-width:2px,color:#ffffff + style C fill:#059669,stroke:#047857,stroke-width:2px,color:#ffffff ``` -LRU Cache -├── items: HashMap (Object.create(null)) → O(1) key lookup -├── first: Node (least recently used) -├── last: Node (most recently used) -└── Linked list via prev/next pointers + +### Core Components + +- **Hash Map (`items`)**: Object.create(null) providing O(1) key-based access to cache nodes +- **Doubly Linked List**: Maintains LRU order with `first` and `last` pointers for O(1) insertion/deletion +- **Cache Nodes**: Store key, value, expiry timestamp, and linked list pointers (prev/next) +- **LRU Class Properties**: + - `first`: Pointer to least recently used item + - `last`: Pointer to most recently used item + - `items`: Hash map for O(1) key lookup + - `max`: Maximum cache size (0 = unlimited) + - `size`: Current number of items + - `ttl`: Time-to-live in milliseconds (0 = no expiration) + - `resetTtl`: Whether to reset TTL on access + +## Data Flow + +### Cache Hit Scenario + +```mermaid +sequenceDiagram + participant Client + participant LRU as LRU Cache + participant HashMap as Hash Map + participant LinkedList as Linked List + + Client->>LRU: get(key) + LRU->>HashMap: items[key] + HashMap-->>LRU: node reference + + alt TTL enabled + LRU->>LRU: check item.expiry <= Date.now() + alt expired + LRU->>HashMap: delete items[key] + LRU->>LinkedList: remove node + LRU-->>Client: undefined + else not expired + LRU->>LRU: moveToEnd(item) - O(1) optimization + LRU-->>Client: item.value + end + else no TTL + LRU->>LRU: moveToEnd(item) - O(1) optimization + LRU-->>Client: item.value + end ``` -### Node Structure +### Cache Miss and Eviction Scenario -```javascript -{ - key: string, - value: *, - expiry: number, // timestamp or 0 - prev: Node | null, - next: Node | null +```mermaid +sequenceDiagram + participant Client + participant LRU as LRU Cache + participant HashMap as Hash Map + participant LinkedList as Linked List + + Client->>LRU: set(key, value) + LRU->>HashMap: check items[key] + HashMap-->>LRU: undefined (miss) + + alt cache full (size === max) + LRU->>LRU: evict() - remove this.first + LRU->>HashMap: delete items[first.key] + LRU->>LinkedList: update first pointer + Note over LRU: LRU eviction complete + end + + LRU->>HashMap: items[key] = new item + LRU->>LinkedList: set item.prev = this.last + LRU->>LinkedList: update this.last = item + LRU->>LRU: increment size + LRU-->>Client: this (chainable) +``` + +## Core Operations + +### Time Complexity + +| Operation | Average Case | Worst Case | Space | Description | +|-----------|--------------|------------|-------|-------------| +| `get(key)` | O(1) | O(1) | O(1) | Retrieve value and move to end | +| `set(key, value)` | O(1) | O(1) | O(1) | Store value, evict if needed | +| `setWithEvicted(key, value)` | O(1) | O(1) | O(1) | Store value, return evicted item | +| `delete(key)` | O(1) | O(1) | O(1) | Remove item from cache | +| `has(key)` | O(1) | O(1) | O(1) | Check key existence | +| `clear()` | O(1) | O(1) | O(1) | Reset all pointers | +| `evict()` | O(1) | O(1) | O(1) | Remove least recently used item | +| `expiresAt(key)` | O(1) | O(1) | O(1) | Get expiration timestamp | +| `moveToEnd(item)` | O(1) | O(1) | O(1) | Internal: optimize LRU positioning | +| `keys()` | O(n) | O(n) | O(n) | Array of all keys in LRU order | +| `values(keys?)` | O(n) | O(n) | O(n) | Array of values for specified keys | +| `entries(keys?)` | O(n) | O(n) | O(n) | Array of [key, value] pairs | + +### Memory Usage + +- **Per Node**: ~120 bytes (key + value + pointers + metadata) +- **Base Overhead**: ~200 bytes (class instance + hash map) +- **Total**: `base + (nodes × 120)` bytes approximately + +## Mathematical Foundation + +### Core Operations + +The LRU cache maintains a doubly-linked list $L$ and a hash table $H$ for O(1) operations: + +**Data Structure:** +- $L = (first, last, size)$ - Doubly-linked list with head/tail pointers +- $H: K \rightarrow \{key: K, value: V, prev: Object, next: Object, expiry: \mathbb{N}_0\}$ - Hash table mapping keys to item objects +- $max \in \mathbb{N}_0$ - Maximum cache size (0 = unlimited) +- $ttl \in \mathbb{N}_0$ - Time-to-live in milliseconds +- $resetTtl \in \{\text{true}, \text{false}\}$ - Whether to reset TTL on set() operations + +**Core Methods:** + +**Note:** The mathematical notation uses `create(k, v)` to represent the item creation logic that is inline in the actual implementation. + +#### Set Operation: $set(k, v, bypass = false, resetTtl = resetTtl) \rightarrow \text{LRU}$ +$$\begin{align} +set(k, v, bypass, resetTtl) &= \begin{cases} +update(k, v, bypass, resetTtl) & \text{if } k \in H \\ +insert(k, v) & \text{if } k \notin H +\end{cases} \\ +update(k, v, bypass, resetTtl) &= H[k].value \leftarrow v \land moveToEnd(H[k]) \\ +& \quad \land \begin{cases} +H[k].expiry \leftarrow t_{now} + ttl & \text{if } bypass = false \land resetTtl = true \land ttl > 0 \\ +\text{no-op} & \text{otherwise} +\end{cases} \\ +insert(k, v) &= \begin{cases} +evict() \land create(k, v) & \text{if } max > 0 \land size = max \\ +create(k, v) & \text{otherwise} +\end{cases} \\ +create(k, v) &= H[k] \leftarrow \{key: k, value: v, prev: last, next: null, expiry: t_{now} + ttl\} \\ +& \quad \land last \leftarrow H[k] \land size \leftarrow size + 1 \\ +& \quad \land \begin{cases} +first \leftarrow H[k] & \text{if } size = 1 \\ +last.next \leftarrow H[k] & \text{otherwise} +\end{cases} +\end{align}$$ + +**Time Complexity:** $O(1)$ amortized + +#### Set With Evicted Operation: $setWithEvicted(k, v, resetTtl = resetTtl) \rightarrow \{key: K, value: V, expiry: \mathbb{N}_0, prev: Object, next: Object\} \cup \{\bot\}$ +$$\begin{align} +setWithEvicted(k, v, resetTtl) &= \begin{cases} +set(k, v, true, resetTtl) \land \bot & \text{if } k \in H \\ +evicted \land create(k, v) & \text{if } k \notin H \land max > 0 \land size = max \\ +\bot \land create(k, v) & \text{if } k \notin H \land (max = 0 \lor size < max) +\end{cases} \\ +\text{where } evicted &= \begin{cases} +\{...this.first\} & \text{if } size > 0 \\ +\bot & \text{otherwise} +\end{cases} +\end{align}$$ + +**Note:** `setWithEvicted()` always calls `set()` with `bypass = true`, which means TTL is never reset during `setWithEvicted()` operations, regardless of the `resetTtl` parameter. + +**Time Complexity:** $O(1)$ amortized + +#### Get Operation: $get(k) \rightarrow V \cup \{\bot\}$ +$$\begin{align} +get(k) &= \begin{cases} +cleanup(k) \land moveToEnd(H[k]) \land H[k].value & \text{if } k \in H \land (ttl = 0 \lor H[k].expiry > t_{now}) \\ +\bot & \text{otherwise} +\end{cases} +\end{align}$$ + +**Note:** `get()` operations never reset TTL, regardless of the `resetTtl` setting. + +**Time Complexity:** $O(1)$ + +#### Delete Operation: $delete(k) \rightarrow \text{LRU}$ +$$\begin{align} +delete(k) &= \begin{cases} +removeFromList(H[k]) \land H \setminus \{k\} \land size \leftarrow size - 1 & \text{if } k \in H \\ +\text{no-op} & \text{otherwise} +\end{cases} +\end{align}$$ + +**Time Complexity:** $O(1)$ + +#### Move to End: $moveToEnd(item)$ +$$\begin{align} +moveToEnd(item) &= \begin{cases} +\text{no-op} & \text{if } item = last \\ +removeFromList(item) \land appendToList(item) & \text{otherwise} +\end{cases} +\end{align}$$ + +**Time Complexity:** $O(1)$ + +### Eviction Policy + +**LRU Eviction:** When $max > 0 \land size = max$ and inserting a new item: + +$$evict(bypass = false) = \begin{cases} +first \leftarrow first.next \land first.prev \leftarrow null \land H \setminus \{first.key\} \land size \leftarrow size - 1 & \text{if } (bypass \lor size > 0) \\ +\text{no-op} & \text{otherwise} +\end{cases}$$ + +### TTL Expiration + +**Expiration Check:** For any operation accessing key $k$: + +$$isExpired(k) = ttl > 0 \land H[k].expiry \leq t_{now}$$ + +**Automatic Cleanup:** Expired items are removed on access: + +$$cleanup(k) = \begin{cases} +delete(k) & \text{if } isExpired(k) \\ +\text{no-op} & \text{otherwise} +\end{cases}$$ + +**TTL Reset Behavior:** +- TTL is only reset during `set()` operations when `resetTtl = true` and `bypass = false` +- `get()` operations never reset TTL, regardless of the `resetTtl` setting +- `setWithEvicted()` operations never reset TTL because they always call `set()` with `bypass = true` + +### Space Complexity + +- **Worst Case:** $O(n)$ where $n = \min(size, max)$ +- **Hash Table:** $O(n)$ for key-value storage +- **Linked List:** $O(n)$ for LRU ordering +- **Per Item Overhead:** Constant space for prev/next pointers and metadata + +### Invariants + +1. **Size Constraint:** $0 \leq size \leq max$ (when $max > 0$) +2. **List Consistency:** $first \neq null \iff last \neq null \iff size > 0$ +3. **Hash Consistency:** $|H| = size$ +4. **LRU Order:** Items in list are ordered from least to most recently used +5. **TTL Validity:** $ttl = 0 \lor \forall k \in H: H[k].expiry > t_{now}$ +6. **TTL Reset Invariant:** TTL is only reset during `set()` operations when `bypass = false`, never during `get()` or `setWithEvicted()` operations + +## TypeScript Support + +The library includes comprehensive TypeScript definitions with generic type support for type-safe value storage. + +### Interface Definitions + +```typescript +// Factory function with optional generic type +export function lru(max?: number, ttl?: number, resetTtl?: boolean): LRU; + +// Main LRU class with generic value type +export class LRU { + constructor(max?: number, ttl?: number, resetTtl?: boolean); + + // Instance properties + first: LRUItem | null; + items: Record>; + last: LRUItem | null; + max: number; + resetTtl: boolean; + size: number; + ttl: number; + + // Core methods + clear(): this; + delete(key: any): this; + entries(keys?: any[]): [any, T][]; + evict(bypass?: boolean): this; + expiresAt(key: any): number | undefined; + get(key: any): T | undefined; + has(key: any): boolean; + keys(): any[]; + set(key: any, value: T, bypass?: boolean, resetTtl?: boolean): this; + setWithEvicted(key: any, value: T, resetTtl?: boolean): LRUItem | null; + values(keys?: any[]): T[]; +} + +// Internal item structure +interface LRUItem { + expiry: number; + key: any; + prev: LRUItem | null; + next: LRUItem | null; + value: T; +} +``` + +### TypeScript Usage Examples + +```typescript +import { LRU, lru } from 'tiny-lru'; + +// Type-safe cache for user objects +interface User { + id: number; + name: string; + email: string; +} + +const userCache = new LRU(1000, 300000); // 1000 users, 5 min TTL +userCache.set('user_123', { id: 123, name: 'John', email: 'john@example.com' }); +const user: User | undefined = userCache.get('user_123'); // Fully typed + +// Type-safe cache for API responses +interface APIResponse { + data: T; + status: number; + timestamp: number; } + +const apiCache = lru>(500, 600000); // 10 min TTL +apiCache.set('endpoint_abc', { + data: { results: [] }, + status: 200, + timestamp: Date.now() +}); + +// String cache with factory function +const stringCache = lru(100); +stringCache.set('key1', 'value1'); +const value: string | undefined = stringCache.get('key1'); ``` -## Data Structures +## Modern Usage Patterns + +### 1. LLM Response Caching + +Cache expensive AI model responses with content-based keys and reasonable TTLs. ```javascript -export class LRU { - constructor(max = 0, ttl = 0, resetTtl = false) { - this.first = null; // Least recently used - this.items = Object.create(null); // Hash map - this.last = null; // Most recently used - this.max = max; // 0 = unlimited - this.resetTtl = resetTtl; // Reset TTL on set() - this.size = 0; // Current count - this.ttl = ttl; // Milliseconds, 0 = no expiry - } +import { LRU } from 'tiny-lru'; + +class LLMCache { + constructor() { + // Cache up to 1000 responses for 1 hour + this.cache = new LRU(1000, 3600000); // 1 hour TTL + } + + /** + * Generate cache key for LLM request + * @param {string} model - Model identifier + * @param {string} prompt - User prompt + * @param {object} params - Model parameters + */ + generateKey(model, prompt, params = {}) { + const paramsHash = this.hashObject(params); + const promptHash = this.hashString(prompt); + return `llm:${model}:${promptHash}:${paramsHash}`; + } + + async getResponse(model, prompt, params = {}) { + const key = this.generateKey(model, prompt, params); + + // Check cache first + const cached = this.cache.get(key); + if (cached) { + return { ...cached, fromCache: true }; + } + + // Make expensive API call + const response = await this.callLLMAPI(model, prompt, params); + + // Cache the response + this.cache.set(key, { + response: response.text, + tokens: response.tokens, + timestamp: Date.now() + }); + + return { ...response, fromCache: false }; + } + + hashString(str) { + // Simple hash function for demonstration + let hash = 0; + for (let i = 0; i < str.length; i++) { + const char = str.charCodeAt(i); + hash = ((hash << 5) - hash) + char; + hash = hash & hash; // Convert to 32-bit integer + } + return Math.abs(hash).toString(36); + } + + hashObject(obj) { + return this.hashString(JSON.stringify(obj, Object.keys(obj).sort())); + } } ``` -## Time Complexity +### 2. API Response Caching with Rate Limiting + +Cache external API responses with different TTLs based on data sensitivity. -| Operation | Time | Notes | -|-----------|------|-------| -| `get` | O(1) | Checks TTL, moves to end | -| `set` | O(1) | Evicts if full | -| `setWithEvicted` | O(1) | Returns evicted item | -| `delete` | O(1) | Removes from list | -| `has` | O(1) | Checks TTL | -| `evict` | O(1) | Removes first | -| `clear` | O(1) | Resets pointers | -| `keys/values/entries` | O(n) | Iterates list | -| `expiresAt` | O(1) | Direct lookup | +```javascript +import { LRU } from 'tiny-lru'; -## TTL Behavior +class APICache { + constructor() { + this.caches = { + // Fast-changing data: 5 minutes + realtime: new LRU(500, 300000), + // Moderate data: 30 minutes + standard: new LRU(1000, 1800000), + // Stable data: 24 hours + stable: new LRU(2000, 86400000) + }; + } + + async fetchUserProfile(userId, domain = 'users') { + const key = `${domain}:profile:${userId}`; + const cache = this.caches.standard; + + const cached = cache.get(key); + if (cached) { + return cached; + } + + const profile = await fetch(`/api/users/${userId}`).then(r => r.json()); + + // Use setWithEvicted to track what gets evicted for analytics + const evicted = cache.setWithEvicted(key, profile); + if (evicted) { + console.log(`Evicted user profile: ${evicted.key}`); + } + + return profile; + } + + async fetchRealtimeData(symbol, domain = 'market') { + const key = `${domain}:price:${symbol}`; + const cache = this.caches.realtime; + + const cached = cache.get(key); + if (cached) { + return cached; + } + + const data = await fetch(`/api/market/${symbol}`).then(r => r.json()); + cache.set(key, data); + + return data; + } +} +``` -### Expiration +### 3. Database Query Result Caching -Items expire when `Date.now() >= item.expiry`. Expired items are cleaned up on `get()` and `has()`. +Cache expensive database queries with intelligent cache invalidation. ```javascript -// TTL check in get() -if (this.ttl > 0 && item.expiry <= Date.now()) { - this.delete(key); - return undefined; +import { LRU } from 'tiny-lru'; + +class QueryCache { + constructor() { + // No TTL - manual invalidation + this.cache = new LRU(10000); + this.dependencyMap = new Map(); // Track query dependencies + } + + async query(sql, params = [], dependencies = []) { + const key = this.generateQueryKey(sql, params); + + const cached = this.cache.get(key); + if (cached) { + return cached; + } + + const result = await this.executeQuery(sql, params); + this.cache.set(key, result); + + // Track dependencies for invalidation + this.trackDependencies(key, dependencies); + + return result; + } + + generateQueryKey(sql, params) { + const sqlHash = this.hashString(sql.replace(/\s+/g, ' ').trim()); + const paramsHash = this.hashString(JSON.stringify(params)); + return `query:${sqlHash}:${paramsHash}`; + } + + // Invalidate cache when specific tables change + invalidateByTable(tableName) { + const keysToDelete = []; + + for (const [key, deps] of this.dependencyMap.entries()) { + if (deps.includes(tableName)) { + keysToDelete.push(key); + } + } + + keysToDelete.forEach(key => { + this.cache.delete(key); + this.dependencyMap.delete(key); + }); + } + + // Get cache statistics using modern API methods + getCacheStats() { + const allKeys = this.cache.keys(); + const allEntries = this.cache.entries(); // Gets [key, value] pairs + const dependentQueries = this.cache.values( + allKeys.filter(key => this.dependencyMap.has(key)) + ); + + return { + totalQueries: this.cache.size, + queryKeys: allKeys, + dependentQueryCount: dependentQueries.length, + lruOrder: allEntries.map(([key, _]) => key) // Least to most recent + }; + } + + trackDependencies(key, dependencies) { + if (dependencies.length > 0) { + this.dependencyMap.set(key, dependencies); + } + } } ``` -### TTL Reset +### 4. Session and Authentication Caching -TTL only resets during `set()` when both conditions are true: -- `resetTtl = true` (constructor or method parameter) -- `bypass = false` (internal, not exposed) +Cache user sessions and authentication tokens with proper security. ```javascript -// In set() -if (bypass === false && resetTtl) { - item.expiry = this.ttl > 0 ? Date.now() + this.ttl : this.ttl; +import { LRU } from 'tiny-lru'; + +class AuthCache { + constructor() { + // Session cache: 30 minutes with TTL reset on access + this.sessions = new LRU(10000, 1800000, true); + // Token validation cache: 5 minutes, no reset + this.tokens = new LRU(5000, 300000, false); + // Permission cache: 15 minutes + this.permissions = new LRU(5000, 900000); + } + + cacheSession(sessionId, userData, domain = 'app') { + const key = `${domain}:session:${sessionId}`; + this.sessions.set(key, { + userId: userData.userId, + permissions: userData.permissions, + loginTime: Date.now(), + lastActivity: Date.now() + }); + + // Log when this session will expire + const expiryTime = this.sessions.expiresAt(key); + if (expiryTime) { + console.log(`Session ${sessionId} expires at: ${new Date(expiryTime)}`); + } + } + + getSession(sessionId, domain = 'app') { + const key = `${domain}:session:${sessionId}`; + return this.sessions.get(key); + } + + cacheTokenValidation(tokenHash, isValid, userId = null) { + const key = `auth:token:${tokenHash}`; + this.tokens.set(key, { isValid, userId, validatedAt: Date.now() }); + } + + isTokenValid(tokenHash) { + const key = `auth:token:${tokenHash}`; + const cached = this.tokens.get(key); + return cached?.isValid || false; + } } ``` -Important: `get()` never resets TTL, and `setWithEvicted()` always passes `bypass=true`, so TTL is never reset during `setWithEvicted()`. +## Security Considerations -## Core Operations +### Multi-Domain Key Convention + +Implement a hierarchical key naming convention to prevent cross-domain data leakage and improve operational security. + +#### Key Format Specification + +``` +{domain}:{service}:{resource}:{identifier}[:{version}] +``` + +#### Domain Categories + +```javascript +const DOMAIN_PREFIXES = { + // User-related data + USER: 'usr', + // Authentication & authorization + AUTH: 'auth', + // External API responses + API: 'api', + // Database query results + DB: 'db', + // Application logic + APP: 'app', + // System/infrastructure + SYS: 'sys', + // Analytics & metrics + ANALYTICS: 'analytics', + // Machine learning / AI + ML: 'ml' +}; + +const SERVICE_PREFIXES = { + // Authentication services + LOGIN: 'login', + LOGOUT: 'logout', + REFRESH: 'refresh', + // Data services + PROFILE: 'profile', + SETTINGS: 'settings', + // External integrations + PAYMENT: 'payment', + EMAIL: 'email', + SMS: 'sms' +}; +``` -### get(key) +#### Implementation Example ```javascript -get(key) { - const item = this.items[key]; - - if (item !== undefined) { - if (this.ttl > 0 && item.expiry <= Date.now()) { - this.delete(key); - return undefined; +class SecureKeyManager { + constructor(domain, service) { + this.domain = domain; + this.service = service; + this.separator = ':'; + } + + generateKey(resource, identifier, version = null) { + const parts = [this.domain, this.service, resource, identifier]; + if (version) parts.push(version); + + return parts.join(this.separator); + } + + parseKey(key) { + const parts = key.split(this.separator); + return { + domain: parts[0], + service: parts[1], + resource: parts[2], + identifier: parts[3], + version: parts[4] || null + }; + } + + // Validate key follows security convention + validateKey(key) { + const parts = key.split(this.separator); + + if (parts.length < 4 || parts.length > 5) { + throw new Error('Invalid key format: must have 4-5 parts'); + } + + if (!Object.values(DOMAIN_PREFIXES).includes(parts[0])) { + throw new Error(`Invalid domain prefix: ${parts[0]}`); + } + + return true; } - this.moveToEnd(item); - return item.value; - } - - return undefined; } + +// Usage examples +const authKeys = new SecureKeyManager(DOMAIN_PREFIXES.AUTH, SERVICE_PREFIXES.LOGIN); +const userKeys = new SecureKeyManager(DOMAIN_PREFIXES.USER, SERVICE_PREFIXES.PROFILE); +const mlKeys = new SecureKeyManager(DOMAIN_PREFIXES.ML, 'llm'); + +// Generate secure keys +const sessionKey = authKeys.generateKey('session', 'abc123def456'); +// Result: "auth:login:session:abc123def456" + +const profileKey = userKeys.generateKey('data', '12345', 'v2'); +// Result: "usr:profile:data:12345:v2" + +const llmKey = mlKeys.generateKey('response', 'gpt4-prompt-hash'); +// Result: "ml:llm:response:gpt4-prompt-hash" ``` -### set(key, value, bypass, resetTtl) +### Cache Isolation ```javascript -set(key, value, bypass = false, resetTtl = this.resetTtl) { - let item = this.items[key]; - - if (bypass || item !== undefined) { - item.value = value; - if (bypass === false && resetTtl) { - item.expiry = this.ttl > 0 ? Date.now() + this.ttl : this.ttl; - } - this.moveToEnd(item); - } else { - if (this.max > 0 && this.size === this.max) { - this.evict(true); - } - item = this.items[key] = { - expiry: this.ttl > 0 ? Date.now() + this.ttl : this.ttl, - key, - prev: this.last, - next: null, - value - }; - if (++this.size === 1) { - this.first = item; - } else { - this.last.next = item; +class IsolatedCacheManager { + constructor() { + this.caches = new Map(); + } + + getCache(domain, service, maxSize = 1000, ttl = 0) { + const cacheKey = `${domain}:${service}`; + + if (!this.caches.has(cacheKey)) { + this.caches.set(cacheKey, new LRU(maxSize, ttl)); + } + + return this.caches.get(cacheKey); + } + + // Secure method to access only your domain's cache + accessCache(domain, service, operation, ...args) { + if (!this.isAuthorized(domain, service)) { + throw new Error('Unauthorized cache access'); + } + + const cache = this.getCache(domain, service); + return cache[operation](...args); + } + + isAuthorized(domain, service) { + // Implement your authorization logic + return true; // Simplified for example + } + + // Clear caches by domain for security incidents + clearDomain(domain) { + for (const [key, cache] of this.caches.entries()) { + if (key.startsWith(`${domain}:`)) { + cache.clear(); + } + } } - this.last = item; - } - - return this; } ``` -### moveToEnd(item) +## Performance Characteristics + +### Benchmarking Setup ```javascript -moveToEnd(item) { - if (this.last === item) return; - - if (item.prev !== null) item.prev.next = item.next; - if (item.next !== null) item.next.prev = item.prev; - if (this.first === item) this.first = item.next; - - item.prev = this.last; - item.next = null; - if (this.last !== null) this.last.next = item; - this.last = item; - if (this.first === null) this.first = item; +// Performance testing setup +import { LRU } from 'tiny-lru'; +import { performance } from 'perf_hooks'; + +class PerformanceTester { + constructor() { + this.cache = new LRU(10000); + } + + async benchmarkOperations(iterations = 100000) { + const results = {}; + + // Benchmark set operations + const setStart = performance.now(); + for (let i = 0; i < iterations; i++) { + this.cache.set(`key_${i}`, `value_${i}`); + } + const setEnd = performance.now(); + results.setOpsPerSecond = iterations / ((setEnd - setStart) / 1000); + + // Benchmark get operations + const getStart = performance.now(); + for (let i = 0; i < iterations; i++) { + this.cache.get(`key_${i % 5000}`); // Mix hits and misses + } + const getEnd = performance.now(); + results.getOpsPerSecond = iterations / ((getEnd - getStart) / 1000); + + return results; + } } ``` -## Mathematical Specification - -### Set Operation +### Memory Usage Patterns +```mermaid +graph LR + A["Memory Usage"] --> B["Linear Growth"] + B --> C["Until Max Size"] + C --> D["Constant Memory"] + D --> E["With Eviction"] + + F["GC Pressure"] --> G["Low"] + F --> H["Object Reuse"] + F --> I["Minimal Allocation"] + + style A fill:#2563eb,stroke:#1e40af,stroke-width:2px,color:#ffffff + style F fill:#ea580c,stroke:#c2410c,stroke-width:2px,color:#ffffff ``` -set(k, v) → - if k ∈ H: update value, optionally reset TTL, moveToEnd - else: evict if full, create node at end + +## Integration Examples + +### Express.js Middleware + +```javascript +import { LRU } from 'tiny-lru'; + +function createCacheMiddleware(options = {}) { + const cache = new LRU( + options.maxSize || 1000, + options.ttl || 300000 // 5 minutes default + ); + + return (req, res, next) => { + // Generate cache key from request + const key = `http:${req.method}:${req.path}:${JSON.stringify(req.query)}`; + + // Check cache + const cached = cache.get(key); + if (cached) { + res.set(cached.headers); + return res.status(cached.status).json(cached.data); + } + + // Intercept response + const originalSend = res.json; + res.json = function(data) { + // Cache successful responses + if (res.statusCode < 400) { + cache.set(key, { + status: res.statusCode, + headers: res.getHeaders(), + data: data + }); + } + + return originalSend.call(this, data); + }; + + next(); + }; +} + +// Usage +app.use('/api/users', createCacheMiddleware({ ttl: 600000 })); // 10 minutes ``` -### Get Operation +### React Cache Hook +```javascript +import { useMemo, useRef } from 'react'; +import { LRU } from 'tiny-lru'; + +function useCache(maxSize = 100, ttl = 300000) { + const cache = useRef(null); + + if (!cache.current) { + cache.current = new LRU(maxSize, ttl); + } + + const memoizedCache = useMemo(() => ({ + get: (key) => cache.current.get(key), + set: (key, value) => cache.current.set(key, value), + delete: (key) => cache.current.delete(key), + clear: () => cache.current.clear(), + has: (key) => cache.current.has(key) + }), []); + + return memoizedCache; +} + +// Usage in component +function UserProfile({ userId }) { + const cache = useCache(50, 600000); // 10 minutes + const [profile, setProfile] = useState(null); + + useEffect(() => { + const cacheKey = `usr:profile:data:${userId}`; + const cached = cache.get(cacheKey); + + if (cached) { + setProfile(cached); + } else { + fetchUserProfile(userId).then(data => { + cache.set(cacheKey, data); + setProfile(data); + }); + } + }, [userId, cache]); + + return
{/* render profile */}
; +} ``` -get(k) → - if k ∉ H: undefined - else if expired: delete(k), undefined - else: moveToEnd, return value + +## Best Practices + +### 1. Cache Sizing Strategy + +```mermaid +flowchart TD + A["Determine Cache Size"] --> B{"Memory Available?"} + B -->|Limited| C["Conservative Sizing
~1000 items"] + B -->|Abundant| D["Aggressive Sizing
~10000+ items"] + + C --> E["Monitor Hit Rate"] + D --> E + + E --> F{"Hit Rate < 80%?"} + F -->|Yes| G["Increase Size
or Adjust TTL"] + F -->|No| H["Optimize Keys
or Logic"] + + G --> I["Re-evaluate"] + H --> I + + style A fill:#2563eb,stroke:#1e40af,stroke-width:2px,color:#ffffff + style I fill:#059669,stroke:#047857,stroke-width:2px,color:#ffffff + style B fill:#7c3aed,stroke:#5b21b6,stroke-width:2px,color:#ffffff + style F fill:#7c3aed,stroke:#5b21b6,stroke-width:2px,color:#ffffff ``` -### Eviction Policy +### 2. TTL Selection Guidelines + +| Data Type | Recommended TTL | Rationale | +|-----------|----------------|-----------| +| User Sessions | 30-60 minutes | Balance security and UX | +| API Responses | 5-30 minutes | Depends on data freshness needs | +| Database Queries | 15-60 minutes | Based on update frequency | +| LLM Responses | 1-24 hours | Expensive to regenerate | +| Static Content | 24+ hours | Rarely changes | +### 3. Error Handling + +```javascript +class RobustCache { + constructor(maxSize, ttl) { + try { + this.cache = new LRU(maxSize, ttl); + } catch (error) { + console.error('Cache initialization failed:', error); + this.cache = null; + } + } + + safeGet(key) { + try { + return this.cache?.get(key); + } catch (error) { + console.error('Cache get failed:', error); + return undefined; + } + } + + safeSet(key, value) { + try { + return this.cache?.set(key, value); + } catch (error) { + console.error('Cache set failed:', error); + return false; + } + } +} ``` -evict() → - if size > 0: - delete first.key from H - first = first.next - if size becomes 0: last = null - else: first.prev = null + +### 4. Monitoring and Metrics + +```javascript +class MonitoredCache { + constructor(maxSize, ttl) { + this.cache = new LRU(maxSize, ttl); + this.metrics = { + hits: 0, + misses: 0, + sets: 0, + deletes: 0, + evictions: 0 + }; + } + + get(key) { + const value = this.cache.get(key); + this.metrics[value !== undefined ? 'hits' : 'misses']++; + return value; + } + + set(key, value) { + const hadKey = this.cache.has(key); + const wasAtCapacity = this.cache.size >= this.cache.max; + + const result = this.cache.set(key, value); + + this.metrics.sets++; + if (!hadKey && wasAtCapacity && this.cache.max > 0) { + this.metrics.evictions++; + } + + return result; + } + + getHitRate() { + const total = this.metrics.hits + this.metrics.misses; + return total > 0 ? this.metrics.hits / total : 0; + } + + getMetrics() { + return { + ...this.metrics, + hitRate: this.getHitRate(), + size: this.cache.size, + maxSize: this.cache.max + }; + } +} ``` -## Evicted Item Shape +## Build Configuration and Distribution -`setWithEvicted()` returns: +The library uses Rollup for building and distributing multiple module formats to support different JavaScript environments. + +### Build Process ```javascript +// rollup.config.js +export default [{ + input: "./src/lru.js", + output: [ + // CommonJS for Node.js + { format: "cjs", file: "dist/tiny-lru.cjs" }, + // ES Modules for modern bundlers + { format: "esm", file: "dist/tiny-lru.js" }, + // Minified ES Modules + { format: "esm", file: "dist/tiny-lru.min.js", plugins: [terser()] }, + // UMD for browsers + { format: "umd", file: "dist/tiny-lru.umd.js", name: "lru" }, + // Minified UMD + { format: "umd", file: "dist/tiny-lru.umd.min.js", name: "lru", plugins: [terser()] } + ] +}]; +``` + +### Package Exports + +```json { - key: string, - value: *, - expiry: number + "source": "src/lru.js", + "main": "dist/tiny-lru.cjs", + "exports": { + "types": "./types/lru.d.ts", + "import": "./dist/tiny-lru.js", + "require": "./dist/tiny-lru.cjs" + }, + "type": "module", + "types": "types/lru.d.ts" } ``` -Not the full node with `prev`/`next` pointers. +### Available Formats + +- **ESM**: `dist/tiny-lru.js` - ES Modules for modern bundlers +- **CommonJS**: `dist/tiny-lru.cjs` - Node.js compatible format +- **UMD**: `dist/tiny-lru.umd.js` - Universal format for browsers +- **Minified**: All formats available with `.min.js` extension +- **TypeScript**: `types/lru.d.ts` - Complete type definitions -## Space Complexity +### Development Commands -- O(n) where n = min(size, max) -- Each item: key + value + expiry + 2 pointers -- Hash map overhead for object +```bash +# Build all distribution formats +npm run build + +# Run tests with coverage +npm test -## Invariants +# Lint code +npm run lint -1. `first === null` iff `last === null` iff `size === 0` -2. `|items| === size` -3. List traversal from `first` reaches `last` in O(n) -4. `has()` returns false for expired items -5. `get()` cleans up expired items +# Run benchmarks +npm run benchmark:all +``` -## File Structure +### File Structure ``` tiny-lru/ -├── src/lru.js # Implementation (~500 lines) -├── types/lru.d.ts # TypeScript definitions -├── tests/unit/lru.js # Node test runner tests -├── docs/ -│ ├── API.md # API reference -│ ├── CODE_STYLE_GUIDE.md -│ └── TECHNICAL_DOCUMENTATION.md -├── dist/ # Built files -├── benchmarks/ # Performance tests -└── package.json +├── src/ +│ └── lru.js # Source implementation +├── types/ +│ └── lru.d.ts # TypeScript definitions +├── dist/ # Built distributions (generated) +│ ├── tiny-lru.js # ES Modules +│ ├── tiny-lru.cjs # CommonJS +│ ├── tiny-lru.min.js # Minified ESM +│ ├── tiny-lru.umd.js # UMD +│ └── tiny-lru.umd.min.js # Minified UMD +├── tests/ +│ ├── unit/ # Unit tests with mocha +│ └── integration/ # Integration tests +├── benchmarks/ # Performance benchmarks +└── docs/ # Documentation ``` -## Testing +## Conclusion -```bash -npm test # Run lint and tests -node --test tests/**/*.js # Run tests only -``` +The tiny-lru library provides a robust foundation for caching in modern applications. By following these patterns, security guidelines, and best practices, you can build efficient, secure, and maintainable caching solutions for contemporary use cases including AI/ML applications, API gateways, and high-performance web services. -Tests use Node's native test runner (`node:test`) with `node:assert`. +Remember to: +- Use proper key namespacing for security +- Monitor cache performance and hit rates +- Implement appropriate TTL strategies +- Handle errors gracefully +- Consider memory constraints in your sizing decisions +- Choose the appropriate module format for your environment +- Leverage TypeScript support for type safety From d125a12dcfa1f9b0734c5269257f4d17b5c6cc99 Mon Sep 17 00:00:00 2001 From: Jason Mulligan Date: Fri, 20 Mar 2026 20:24:08 -0400 Subject: [PATCH 14/28] Fix TECHNICAL_DOCUMENTATION.md to accurately reflect implementation --- docs/TECHNICAL_DOCUMENTATION.md | 10 +++++----- 1 file changed, 5 insertions(+), 5 deletions(-) diff --git a/docs/TECHNICAL_DOCUMENTATION.md b/docs/TECHNICAL_DOCUMENTATION.md index f60d026..b7637ea 100644 --- a/docs/TECHNICAL_DOCUMENTATION.md +++ b/docs/TECHNICAL_DOCUMENTATION.md @@ -56,7 +56,7 @@ graph TD - `max`: Maximum cache size (0 = unlimited) - `size`: Current number of items - `ttl`: Time-to-live in milliseconds (0 = no expiration) - - `resetTtl`: Whether to reset TTL on access + - `resetTtl`: Whether to reset TTL on `set()` operations (not on `get()`) ## Data Flow @@ -133,7 +133,7 @@ sequenceDiagram | `moveToEnd(item)` | O(1) | O(1) | O(1) | Internal: optimize LRU positioning | | `keys()` | O(n) | O(n) | O(n) | Array of all keys in LRU order | | `values(keys?)` | O(n) | O(n) | O(n) | Array of values for specified keys | -| `entries(keys?)` | O(n) | O(n) | O(n) | Array of [key, value] pairs | +| `entries([keys])` | O(n) | O(n) | O(n) | Array of [key, value] pairs | ### Memory Usage @@ -183,7 +183,7 @@ last.next \leftarrow H[k] & \text{otherwise} **Time Complexity:** $O(1)$ amortized -#### Set With Evicted Operation: $setWithEvicted(k, v, resetTtl = resetTtl) \rightarrow \{key: K, value: V, expiry: \mathbb{N}_0, prev: Object, next: Object\} \cup \{\bot\}$ +#### Set With Evicted Operation: $setWithEvicted(k, v, resetTtl = resetTtl) \rightarrow \{key: K, value: V, expiry: \mathbb{N}_0\} \cup \{\bot\}$ $$\begin{align} setWithEvicted(k, v, resetTtl) &= \begin{cases} set(k, v, true, resetTtl) \land \bot & \text{if } k \in H \\ @@ -191,7 +191,7 @@ evicted \land create(k, v) & \text{if } k \notin H \land max > 0 \land size = ma \bot \land create(k, v) & \text{if } k \notin H \land (max = 0 \lor size < max) \end{cases} \\ \text{where } evicted &= \begin{cases} -\{...this.first\} & \text{if } size > 0 \\ +\{key: this.first.key, value: this.first.value, expiry: this.first.expiry\} & \text{if } size > 0 \\ \bot & \text{otherwise} \end{cases} \end{align}$$ @@ -308,7 +308,7 @@ export class LRU { has(key: any): boolean; keys(): any[]; set(key: any, value: T, bypass?: boolean, resetTtl?: boolean): this; - setWithEvicted(key: any, value: T, resetTtl?: boolean): LRUItem | null; + setWithEvicted(key: any, value: T, resetTtl?: boolean): { key: any; value: T; expiry: number } | null; values(keys?: any[]): T[]; } From 87c71f0ad2a5b67312dd66ba8bdd51d4edc44d7f Mon Sep 17 00:00:00 2001 From: Jason Mulligan Date: Fri, 20 Mar 2026 20:27:13 -0400 Subject: [PATCH 15/28] Fix Mathematical Foundation section in TECHNICAL_DOCUMENTATION.md - Add removeFromList definition with all 4 prev/next cases - Expand moveToEnd formula and document 'only node' edge case - Fix TTL validity invariant to handle expiry=0 when ttl=0 --- docs/TECHNICAL_DOCUMENTATION.md | 12 ++++++++++-- 1 file changed, 10 insertions(+), 2 deletions(-) diff --git a/docs/TECHNICAL_DOCUMENTATION.md b/docs/TECHNICAL_DOCUMENTATION.md index b7637ea..02a67cb 100644 --- a/docs/TECHNICAL_DOCUMENTATION.md +++ b/docs/TECHNICAL_DOCUMENTATION.md @@ -217,6 +217,12 @@ $$\begin{align} delete(k) &= \begin{cases} removeFromList(H[k]) \land H \setminus \{k\} \land size \leftarrow size - 1 & \text{if } k \in H \\ \text{no-op} & \text{otherwise} +\end{cases} \\ +removeFromList(item) &= \begin{cases} +item.prev.next \leftarrow item.next \land item.next.prev \leftarrow item.prev \land first \leftarrow item.next \land last \leftarrow item.prev & \text{if } item.prev \neq null \land item.next \neq null \\ +item.prev.next \leftarrow item.next \land first \leftarrow item.next \land last \leftarrow null & \text{if } item.prev \neq null \land item.next = null \\ +item.next.prev \leftarrow item.prev \land first \leftarrow item.next \land last \leftarrow null & \text{if } item.prev = null \land item.next \neq null \\ +first \leftarrow null \land last \leftarrow null & \text{if } item.prev = null \land item.next = null \end{cases} \end{align}$$ @@ -226,10 +232,12 @@ removeFromList(H[k]) \land H \setminus \{k\} \land size \leftarrow size - 1 & \t $$\begin{align} moveToEnd(item) &= \begin{cases} \text{no-op} & \text{if } item = last \\ -removeFromList(item) \land appendToList(item) & \text{otherwise} +item.prev.next \leftarrow item.next \land item.next.prev \leftarrow item.prev \land first \leftarrow item.next \land item.prev \leftarrow last \land last.next \leftarrow item \land last \leftarrow item \land first \leftarrow item \lor first & \text{if } item \neq last \end{cases} \end{align}$$ +**Edge Case:** When item is the only node in the list ($item.prev = null \land item.next = null$), the condition $item = last$ is true since $first = last = item$, so the operation is a no-op. + **Time Complexity:** $O(1)$ ### Eviction Policy @@ -272,7 +280,7 @@ delete(k) & \text{if } isExpired(k) \\ 2. **List Consistency:** $first \neq null \iff last \neq null \iff size > 0$ 3. **Hash Consistency:** $|H| = size$ 4. **LRU Order:** Items in list are ordered from least to most recently used -5. **TTL Validity:** $ttl = 0 \lor \forall k \in H: H[k].expiry > t_{now}$ +5. **TTL Validity:** $(ttl = 0 \Rightarrow \forall k \in H: H[k].expiry = 0) \land (ttl > 0 \Rightarrow \forall k \in H: H[k].expiry > t_{now})$ 6. **TTL Reset Invariant:** TTL is only reset during `set()` operations when `bypass = false`, never during `get()` or `setWithEvicted()` operations ## TypeScript Support From 281b3f041ac225a9ab1b76118e61cc185c2d8d3d Mon Sep 17 00:00:00 2001 From: Jason Mulligan Date: Fri, 20 Mar 2026 20:37:00 -0400 Subject: [PATCH 16/28] Fix memory leak, stale data, and improve performance - Clear prev/next pointers in delete() and evict() to prevent memory leaks - Fix entries() and values() to not pollute LRU order (access items directly instead of calling get()) - Fix entries() and values() returning stale data with TTL (direct item access instead of get() which can delete expired items) - Fix expiresAt() to return expiry for expired-but-not-yet-deleted items - Optimize setWithEvicted() to avoid redundant has()+set() calls - Remove dead code in moveToEnd() (unreachable edge case) - Remove obsolete moveToEnd edge case test --- dist/tiny-lru.cjs | 75 +++++++++++++++++++++--------------- dist/tiny-lru.js | 75 +++++++++++++++++++++--------------- dist/tiny-lru.min.js | 2 +- dist/tiny-lru.min.js.map | 2 +- dist/tiny-lru.umd.js | 75 +++++++++++++++++++++--------------- dist/tiny-lru.umd.min.js | 2 +- dist/tiny-lru.umd.min.js.map | 2 +- src/lru.js | 40 +++++++++---------- tests/unit/lru.js | 33 ---------------- 9 files changed, 158 insertions(+), 148 deletions(-) diff --git a/dist/tiny-lru.cjs b/dist/tiny-lru.cjs index 7baf605..f6ddf69 100644 --- a/dist/tiny-lru.cjs +++ b/dist/tiny-lru.cjs @@ -85,9 +85,9 @@ class LRU { * @since 1.0.0 */ delete (key) { - if (this.has(key)) { - const item = this.items[key]; + const item = this.items[key]; + if (item !== undefined) { delete this.items[key]; this.size--; @@ -106,6 +106,9 @@ class LRU { if (this.last === item) { this.last = item.prev; } + + item.prev = null; + item.next = null; } return this; @@ -127,11 +130,16 @@ class LRU { * @see {@link LRU#values} * @since 11.1.0 */ - entries (keys = this.keys()) { - const result = new Array(keys.length); + entries (keys) { + if (keys === undefined) { + keys = this.keys(); + } + + const result = Array.from({ length: keys.length }); for (let i = 0; i < keys.length; i++) { const key = keys[i]; - result[i] = [key, this.get(key)]; + const item = this.items[key]; + result[i] = [key, item !== undefined ? item.value : undefined]; } return result; @@ -154,6 +162,10 @@ class LRU { if (bypass || this.size > 0) { const item = this.first; + if (!item) { + return this; + } + delete this.items[item.key]; if (--this.size === 0) { @@ -163,6 +175,8 @@ class LRU { this.first = item.next; this.first.prev = null; } + + item.next = null; } return this; @@ -184,13 +198,8 @@ class LRU { * @since 1.0.0 */ expiresAt (key) { - let result; - - if (this.has(key)) { - result = this.items[key].expiry; - } - - return result; + const item = this.items[key]; + return item !== undefined ? item.expiry : undefined; } /** @@ -246,7 +255,8 @@ class LRU { * @since 9.0.0 */ has (key) { - return key in this.items; + const item = this.items[key]; + return item !== undefined && (this.ttl === 0 || item.expiry > Date.now()); } /** @@ -261,12 +271,10 @@ class LRU { * @since 11.3.5 */ moveToEnd (item) { - // If already at the end, nothing to do if (this.last === item) { return; } - // Remove item from current position in the list if (item.prev !== null) { item.prev.next = item.next; } @@ -275,12 +283,10 @@ class LRU { item.next.prev = item.prev; } - // Update first pointer if this was the first item if (this.first === item) { this.first = item.next; } - // Add item to the end item.prev = this.last; item.next = null; @@ -289,11 +295,6 @@ class LRU { } this.last = item; - - // Handle edge case: if this was the only item, it's also first - if (this.first === null) { - this.first = item; - } } /** @@ -311,7 +312,7 @@ class LRU { * @since 9.0.0 */ keys () { - const result = new Array(this.size); + const result = Array.from({ length: this.size }); let x = this.first; let i = 0; @@ -342,16 +343,25 @@ class LRU { */ setWithEvicted (key, value, resetTtl = this.resetTtl) { let evicted = null; + let item = this.items[key]; - if (this.has(key)) { - this.set(key, value, true, resetTtl); + if (item !== undefined) { + item.value = value; + if (resetTtl) { + item.expiry = this.ttl > 0 ? Date.now() + this.ttl : this.ttl; + } + this.moveToEnd(item); } else { if (this.max > 0 && this.size === this.max) { - evicted = {...this.first}; + evicted = { + key: this.first.key, + value: this.first.value, + expiry: this.first.expiry + }; this.evict(true); } - let item = this.items[key] = { + item = this.items[key] = { expiry: this.ttl > 0 ? Date.now() + this.ttl : this.ttl, key: key, prev: this.last, @@ -444,10 +454,15 @@ class LRU { * @see {@link LRU#entries} * @since 11.1.0 */ - values (keys = this.keys()) { - const result = new Array(keys.length); + values (keys) { + if (keys === undefined) { + keys = this.keys(); + } + + const result = Array.from({ length: keys.length }); for (let i = 0; i < keys.length; i++) { - result[i] = this.get(keys[i]); + const item = this.items[keys[i]]; + result[i] = item !== undefined ? item.value : undefined; } return result; diff --git a/dist/tiny-lru.js b/dist/tiny-lru.js index cdec409..ce91e51 100644 --- a/dist/tiny-lru.js +++ b/dist/tiny-lru.js @@ -83,9 +83,9 @@ class LRU { * @since 1.0.0 */ delete (key) { - if (this.has(key)) { - const item = this.items[key]; + const item = this.items[key]; + if (item !== undefined) { delete this.items[key]; this.size--; @@ -104,6 +104,9 @@ class LRU { if (this.last === item) { this.last = item.prev; } + + item.prev = null; + item.next = null; } return this; @@ -125,11 +128,16 @@ class LRU { * @see {@link LRU#values} * @since 11.1.0 */ - entries (keys = this.keys()) { - const result = new Array(keys.length); + entries (keys) { + if (keys === undefined) { + keys = this.keys(); + } + + const result = Array.from({ length: keys.length }); for (let i = 0; i < keys.length; i++) { const key = keys[i]; - result[i] = [key, this.get(key)]; + const item = this.items[key]; + result[i] = [key, item !== undefined ? item.value : undefined]; } return result; @@ -152,6 +160,10 @@ class LRU { if (bypass || this.size > 0) { const item = this.first; + if (!item) { + return this; + } + delete this.items[item.key]; if (--this.size === 0) { @@ -161,6 +173,8 @@ class LRU { this.first = item.next; this.first.prev = null; } + + item.next = null; } return this; @@ -182,13 +196,8 @@ class LRU { * @since 1.0.0 */ expiresAt (key) { - let result; - - if (this.has(key)) { - result = this.items[key].expiry; - } - - return result; + const item = this.items[key]; + return item !== undefined ? item.expiry : undefined; } /** @@ -244,7 +253,8 @@ class LRU { * @since 9.0.0 */ has (key) { - return key in this.items; + const item = this.items[key]; + return item !== undefined && (this.ttl === 0 || item.expiry > Date.now()); } /** @@ -259,12 +269,10 @@ class LRU { * @since 11.3.5 */ moveToEnd (item) { - // If already at the end, nothing to do if (this.last === item) { return; } - // Remove item from current position in the list if (item.prev !== null) { item.prev.next = item.next; } @@ -273,12 +281,10 @@ class LRU { item.next.prev = item.prev; } - // Update first pointer if this was the first item if (this.first === item) { this.first = item.next; } - // Add item to the end item.prev = this.last; item.next = null; @@ -287,11 +293,6 @@ class LRU { } this.last = item; - - // Handle edge case: if this was the only item, it's also first - if (this.first === null) { - this.first = item; - } } /** @@ -309,7 +310,7 @@ class LRU { * @since 9.0.0 */ keys () { - const result = new Array(this.size); + const result = Array.from({ length: this.size }); let x = this.first; let i = 0; @@ -340,16 +341,25 @@ class LRU { */ setWithEvicted (key, value, resetTtl = this.resetTtl) { let evicted = null; + let item = this.items[key]; - if (this.has(key)) { - this.set(key, value, true, resetTtl); + if (item !== undefined) { + item.value = value; + if (resetTtl) { + item.expiry = this.ttl > 0 ? Date.now() + this.ttl : this.ttl; + } + this.moveToEnd(item); } else { if (this.max > 0 && this.size === this.max) { - evicted = {...this.first}; + evicted = { + key: this.first.key, + value: this.first.value, + expiry: this.first.expiry + }; this.evict(true); } - let item = this.items[key] = { + item = this.items[key] = { expiry: this.ttl > 0 ? Date.now() + this.ttl : this.ttl, key: key, prev: this.last, @@ -442,10 +452,15 @@ class LRU { * @see {@link LRU#entries} * @since 11.1.0 */ - values (keys = this.keys()) { - const result = new Array(keys.length); + values (keys) { + if (keys === undefined) { + keys = this.keys(); + } + + const result = Array.from({ length: keys.length }); for (let i = 0; i < keys.length; i++) { - result[i] = this.get(keys[i]); + const item = this.items[keys[i]]; + result[i] = item !== undefined ? item.value : undefined; } return result; diff --git a/dist/tiny-lru.min.js b/dist/tiny-lru.min.js index 63f8d9a..738a943 100644 --- a/dist/tiny-lru.min.js +++ b/dist/tiny-lru.min.js @@ -2,4 +2,4 @@ 2026 Jason Mulligan @version 11.4.7 */ -class t{constructor(t=0,s=0,e=!1){this.first=null,this.items=Object.create(null),this.last=null,this.max=t,this.resetTtl=e,this.size=0,this.ttl=s}clear(){return this.first=null,this.items=Object.create(null),this.last=null,this.size=0,this}delete(t){if(this.has(t)){const s=this.items[t];delete this.items[t],this.size--,null!==s.prev&&(s.prev.next=s.next),null!==s.next&&(s.next.prev=s.prev),this.first===s&&(this.first=s.next),this.last===s&&(this.last=s.prev)}return this}entries(t=this.keys()){const s=new Array(t.length);for(let e=0;e0){const t=this.first;delete this.items[t.key],0==--this.size?(this.first=null,this.last=null):(this.first=t.next,this.first.prev=null)}return this}expiresAt(t){let s;return this.has(t)&&(s=this.items[t].expiry),s}get(t){const s=this.items[t];if(void 0!==s)return this.ttl>0&&s.expiry<=Date.now()?void this.delete(t):(this.moveToEnd(s),s.value)}has(t){return t in this.items}moveToEnd(t){this.last!==t&&(null!==t.prev&&(t.prev.next=t.next),null!==t.next&&(t.next.prev=t.prev),this.first===t&&(this.first=t.next),t.prev=this.last,t.next=null,null!==this.last&&(this.last.next=t),this.last=t,null===this.first&&(this.first=t))}keys(){const t=new Array(this.size);let s=this.first,e=0;for(;null!==s;)t[e++]=s.key,s=s.next;return t}setWithEvicted(t,s,e=this.resetTtl){let i=null;if(this.has(t))this.set(t,s,!0,e);else{this.max>0&&this.size===this.max&&(i={...this.first},this.evict(!0));let e=this.items[t]={expiry:this.ttl>0?Date.now()+this.ttl:this.ttl,key:t,prev:this.last,next:null,value:s};1==++this.size?this.first=e:this.last.next=e,this.last=e}return i}set(t,s,e=!1,i=this.resetTtl){let l=this.items[t];return e||void 0!==l?(l.value=s,!1===e&&i&&(l.expiry=this.ttl>0?Date.now()+this.ttl:this.ttl),this.moveToEnd(l)):(this.max>0&&this.size===this.max&&this.evict(!0),l=this.items[t]={expiry:this.ttl>0?Date.now()+this.ttl:this.ttl,key:t,prev:this.last,next:null,value:s},1==++this.size?this.first=l:this.last.next=l,this.last=l),this}values(t=this.keys()){const s=new Array(t.length);for(let e=0;e0){const t=this.first;if(!t)return this;delete this.items[t.key],0==--this.size?(this.first=null,this.last=null):(this.first=t.next,this.first.prev=null),t.next=null}return this}expiresAt(t){const s=this.items[t];return void 0!==s?s.expiry:void 0}get(t){const s=this.items[t];if(void 0!==s)return this.ttl>0&&s.expiry<=Date.now()?void this.delete(t):(this.moveToEnd(s),s.value)}has(t){const s=this.items[t];return void 0!==s&&(0===this.ttl||s.expiry>Date.now())}moveToEnd(t){this.last!==t&&(null!==t.prev&&(t.prev.next=t.next),null!==t.next&&(t.next.prev=t.prev),this.first===t&&(this.first=t.next),t.prev=this.last,t.next=null,null!==this.last&&(this.last.next=t),this.last=t)}keys(){const t=Array.from({length:this.size});let s=this.first,i=0;for(;null!==s;)t[i++]=s.key,s=s.next;return t}setWithEvicted(t,s,i=this.resetTtl){let e=null,l=this.items[t];return void 0!==l?(l.value=s,i&&(l.expiry=this.ttl>0?Date.now()+this.ttl:this.ttl),this.moveToEnd(l)):(this.max>0&&this.size===this.max&&(e={key:this.first.key,value:this.first.value,expiry:this.first.expiry},this.evict(!0)),l=this.items[t]={expiry:this.ttl>0?Date.now()+this.ttl:this.ttl,key:t,prev:this.last,next:null,value:s},1==++this.size?this.first=l:this.last.next=l,this.last=l),e}set(t,s,i=!1,e=this.resetTtl){let l=this.items[t];return i||void 0!==l?(l.value=s,!1===i&&e&&(l.expiry=this.ttl>0?Date.now()+this.ttl:this.ttl),this.moveToEnd(l)):(this.max>0&&this.size===this.max&&this.evict(!0),l=this.items[t]={expiry:this.ttl>0?Date.now()+this.ttl:this.ttl,key:t,prev:this.last,next:null,value:s},1==++this.size?this.first=l:this.last.next=l,this.last=l),this}values(t){void 0===t&&(t=this.keys());const s=Array.from({length:t.length});for(let i=0;i>} Array of [key, value] pairs in LRU order.\n\t * @example\n\t * cache.set('a', 1).set('b', 2);\n\t * console.log(cache.entries()); // [['a', 1], ['b', 2]]\n\t * console.log(cache.entries(['a'])); // [['a', 1]]\n\t * @see {@link LRU#keys}\n\t * @see {@link LRU#values}\n\t * @since 11.1.0\n\t */\n\tentries (keys = this.keys()) {\n\t\tconst result = new Array(keys.length);\n\t\tfor (let i = 0; i < keys.length; i++) {\n\t\t\tconst key = keys[i];\n\t\t\tresult[i] = [key, this.get(key)];\n\t\t}\n\n\t\treturn result;\n\t}\n\n\t/**\n\t * Removes the least recently used item from the cache.\n\t *\n\t * @method evict\n\t * @memberof LRU\n\t * @param {boolean} [bypass=false] - Whether to force eviction even when cache is empty.\n\t * @returns {LRU} The LRU instance for method chaining.\n\t * @example\n\t * cache.set('old', 'value').set('new', 'value');\n\t * cache.evict(); // Removes 'old' item\n\t * @see {@link LRU#setWithEvicted}\n\t * @since 1.0.0\n\t */\n\tevict (bypass = false) {\n\t\tif (bypass || this.size > 0) {\n\t\t\tconst item = this.first;\n\n\t\t\tdelete this.items[item.key];\n\n\t\t\tif (--this.size === 0) {\n\t\t\t\tthis.first = null;\n\t\t\t\tthis.last = null;\n\t\t\t} else {\n\t\t\t\tthis.first = item.next;\n\t\t\t\tthis.first.prev = null;\n\t\t\t}\n\t\t}\n\n\t\treturn this;\n\t}\n\n\t/**\n\t * Returns the expiration timestamp for a given key.\n\t *\n\t * @method expiresAt\n\t * @memberof LRU\n\t * @param {string} key - The key to check expiration for.\n\t * @returns {number|undefined} The expiration timestamp in milliseconds, or undefined if key doesn't exist.\n\t * @example\n\t * const cache = new LRU(100, 5000); // 5 second TTL\n\t * cache.set('key1', 'value1');\n\t * console.log(cache.expiresAt('key1')); // timestamp 5 seconds from now\n\t * @see {@link LRU#get}\n\t * @see {@link LRU#has}\n\t * @since 1.0.0\n\t */\n\texpiresAt (key) {\n\t\tlet result;\n\n\t\tif (this.has(key)) {\n\t\t\tresult = this.items[key].expiry;\n\t\t}\n\n\t\treturn result;\n\t}\n\n\t/**\n\t * Retrieves a value from the cache by key. Updates the item's position to most recently used.\n\t *\n\t * @method get\n\t * @memberof LRU\n\t * @param {string} key - The key to retrieve.\n\t * @returns {*} The value associated with the key, or undefined if not found or expired.\n\t * @example\n\t * cache.set('key1', 'value1');\n\t * console.log(cache.get('key1')); // 'value1'\n\t * console.log(cache.get('nonexistent')); // undefined\n\t * @see {@link LRU#set}\n\t * @see {@link LRU#has}\n\t * @since 1.0.0\n\t */\n\tget (key) {\n\t\tconst item = this.items[key];\n\n\t\tif (item !== undefined) {\n\t\t\t// Check TTL only if enabled to avoid unnecessary Date.now() calls\n\t\t\tif (this.ttl > 0) {\n\t\t\t\tif (item.expiry <= Date.now()) {\n\t\t\t\t\tthis.delete(key);\n\n\t\t\t\t\treturn undefined;\n\t\t\t\t}\n\t\t\t}\n\n\t\t\t// Fast LRU update without full set() overhead\n\t\t\tthis.moveToEnd(item);\n\n\t\t\treturn item.value;\n\t\t}\n\n\t\treturn undefined;\n\t}\n\n\t/**\n\t * Checks if a key exists in the cache.\n\t *\n\t * @method has\n\t * @memberof LRU\n\t * @param {string} key - The key to check for.\n\t * @returns {boolean} True if the key exists, false otherwise.\n\t * @example\n\t * cache.set('key1', 'value1');\n\t * console.log(cache.has('key1')); // true\n\t * console.log(cache.has('nonexistent')); // false\n\t * @see {@link LRU#get}\n\t * @see {@link LRU#delete}\n\t * @since 9.0.0\n\t */\n\thas (key) {\n\t\treturn key in this.items;\n\t}\n\n\t/**\n\t * Efficiently moves an item to the end of the LRU list (most recently used position).\n\t * This is an internal optimization method that avoids the overhead of the full set() operation\n\t * when only LRU position needs to be updated.\n\t *\n\t * @method moveToEnd\n\t * @memberof LRU\n\t * @param {Object} item - The cache item with prev/next pointers to reposition.\n\t * @private\n\t * @since 11.3.5\n\t */\n\tmoveToEnd (item) {\n\t\t// If already at the end, nothing to do\n\t\tif (this.last === item) {\n\t\t\treturn;\n\t\t}\n\n\t\t// Remove item from current position in the list\n\t\tif (item.prev !== null) {\n\t\t\titem.prev.next = item.next;\n\t\t}\n\n\t\tif (item.next !== null) {\n\t\t\titem.next.prev = item.prev;\n\t\t}\n\n\t\t// Update first pointer if this was the first item\n\t\tif (this.first === item) {\n\t\t\tthis.first = item.next;\n\t\t}\n\n\t\t// Add item to the end\n\t\titem.prev = this.last;\n\t\titem.next = null;\n\n\t\tif (this.last !== null) {\n\t\t\tthis.last.next = item;\n\t\t}\n\n\t\tthis.last = item;\n\n\t\t// Handle edge case: if this was the only item, it's also first\n\t\tif (this.first === null) {\n\t\t\tthis.first = item;\n\t\t}\n\t}\n\n\t/**\n\t * Returns an array of all keys in the cache, ordered from least to most recently used.\n\t *\n\t * @method keys\n\t * @memberof LRU\n\t * @returns {string[]} Array of keys in LRU order.\n\t * @example\n\t * cache.set('a', 1).set('b', 2);\n\t * cache.get('a'); // Move 'a' to most recent\n\t * console.log(cache.keys()); // ['b', 'a']\n\t * @see {@link LRU#values}\n\t * @see {@link LRU#entries}\n\t * @since 9.0.0\n\t */\n\tkeys () {\n\t\tconst result = new Array(this.size);\n\t\tlet x = this.first;\n\t\tlet i = 0;\n\n\t\twhile (x !== null) {\n\t\t\tresult[i++] = x.key;\n\t\t\tx = x.next;\n\t\t}\n\n\t\treturn result;\n\t}\n\n\t/**\n\t * Sets a value in the cache and returns any evicted item.\n\t *\n\t * @method setWithEvicted\n\t * @memberof LRU\n\t * @param {string} key - The key to set.\n\t * @param {*} value - The value to store.\n\t * @param {boolean} [resetTtl=this.resetTtl] - Whether to reset the TTL for this operation.\n\t * @returns {Object|null} The evicted item (if any) with shape {key, value, expiry, prev, next}, or null.\n\t * @example\n\t * const cache = new LRU(2);\n\t * cache.set('a', 1).set('b', 2);\n\t * const evicted = cache.setWithEvicted('c', 3); // evicted = {key: 'a', value: 1, ...}\n\t * @see {@link LRU#set}\n\t * @see {@link LRU#evict}\n\t * @since 11.3.0\n\t */\n\tsetWithEvicted (key, value, resetTtl = this.resetTtl) {\n\t\tlet evicted = null;\n\n\t\tif (this.has(key)) {\n\t\t\tthis.set(key, value, true, resetTtl);\n\t\t} else {\n\t\t\tif (this.max > 0 && this.size === this.max) {\n\t\t\t\tevicted = {...this.first};\n\t\t\t\tthis.evict(true);\n\t\t\t}\n\n\t\t\tlet item = this.items[key] = {\n\t\t\t\texpiry: this.ttl > 0 ? Date.now() + this.ttl : this.ttl,\n\t\t\t\tkey: key,\n\t\t\t\tprev: this.last,\n\t\t\t\tnext: null,\n\t\t\t\tvalue\n\t\t\t};\n\n\t\t\tif (++this.size === 1) {\n\t\t\t\tthis.first = item;\n\t\t\t} else {\n\t\t\t\tthis.last.next = item;\n\t\t\t}\n\n\t\t\tthis.last = item;\n\t\t}\n\n\t\treturn evicted;\n\t}\n\n\t/**\n\t * Sets a value in the cache. Updates the item's position to most recently used.\n\t *\n\t * @method set\n\t * @memberof LRU\n\t * @param {string} key - The key to set.\n\t * @param {*} value - The value to store.\n\t * @param {boolean} [bypass=false] - Internal parameter for setWithEvicted method.\n\t * @param {boolean} [resetTtl=this.resetTtl] - Whether to reset the TTL for this operation.\n\t * @returns {LRU} The LRU instance for method chaining.\n\t * @example\n\t * cache.set('key1', 'value1')\n\t * .set('key2', 'value2')\n\t * .set('key3', 'value3');\n\t * @see {@link LRU#get}\n\t * @see {@link LRU#setWithEvicted}\n\t * @since 1.0.0\n\t */\n\tset (key, value, bypass = false, resetTtl = this.resetTtl) {\n\t\tlet item = this.items[key];\n\n\t\tif (bypass || item !== undefined) {\n\t\t\t// Existing item: update value and position\n\t\t\titem.value = value;\n\n\t\t\tif (bypass === false && resetTtl) {\n\t\t\t\titem.expiry = this.ttl > 0 ? Date.now() + this.ttl : this.ttl;\n\t\t\t}\n\n\t\t\t// Always move to end, but the bypass parameter affects TTL reset behavior\n\t\t\tthis.moveToEnd(item);\n\t\t} else {\n\t\t\t// New item: check for eviction and create\n\t\t\tif (this.max > 0 && this.size === this.max) {\n\t\t\t\tthis.evict(true);\n\t\t\t}\n\n\t\t\titem = this.items[key] = {\n\t\t\t\texpiry: this.ttl > 0 ? Date.now() + this.ttl : this.ttl,\n\t\t\t\tkey: key,\n\t\t\t\tprev: this.last,\n\t\t\t\tnext: null,\n\t\t\t\tvalue\n\t\t\t};\n\n\t\t\tif (++this.size === 1) {\n\t\t\t\tthis.first = item;\n\t\t\t} else {\n\t\t\t\tthis.last.next = item;\n\t\t\t}\n\n\t\t\tthis.last = item;\n\t\t}\n\n\t\treturn this;\n\t}\n\n\t/**\n\t * Returns an array of all values in the cache for the specified keys.\n\t * Order follows LRU order (least to most recently used).\n\t *\n\t * @method values\n\t * @memberof LRU\n\t * @param {string[]} [keys=this.keys()] - Array of keys to get values for. Defaults to all keys.\n\t * @returns {Array<*>} Array of values corresponding to the keys in LRU order.\n\t * @example\n\t * cache.set('a', 1).set('b', 2);\n\t * console.log(cache.values()); // [1, 2]\n\t * console.log(cache.values(['a'])); // [1]\n\t * @see {@link LRU#keys}\n\t * @see {@link LRU#entries}\n\t * @since 11.1.0\n\t */\n\tvalues (keys = this.keys()) {\n\t\tconst result = new Array(keys.length);\n\t\tfor (let i = 0; i < keys.length; i++) {\n\t\t\tresult[i] = this.get(keys[i]);\n\t\t}\n\n\t\treturn result;\n\t}\n}\n\n/**\n * Factory function to create a new LRU cache instance with parameter validation.\n *\n * @function lru\n * @param {number} [max=1000] - Maximum number of items to store. Must be >= 0. Use 0 for unlimited size.\n * @param {number} [ttl=0] - Time to live in milliseconds. Must be >= 0. Use 0 for no expiration.\n * @param {boolean} [resetTtl=false] - Whether to reset TTL when accessing existing items via get().\n * @returns {LRU} A new LRU cache instance.\n * @throws {TypeError} When parameters are invalid (negative numbers or wrong types).\n * @example\n * // Create cache with factory function\n * const cache = lru(100, 5000, true);\n * cache.set('key', 'value');\n *\n * @example\n * // Error handling\n * try {\n * const cache = lru(-1); // Invalid max\n * } catch (error) {\n * console.error(error.message); // \"Invalid max value\"\n * }\n * @see {@link LRU}\n * @since 1.0.0\n */\nexport function lru (max = 1000, ttl = 0, resetTtl = false) {\n\tif (isNaN(max) || max < 0) {\n\t\tthrow new TypeError(\"Invalid max value\");\n\t}\n\n\tif (isNaN(ttl) || ttl < 0) {\n\t\tthrow new TypeError(\"Invalid ttl value\");\n\t}\n\n\tif (typeof resetTtl !== \"boolean\") {\n\t\tthrow new TypeError(\"Invalid resetTtl value\");\n\t}\n\n\treturn new LRU(max, ttl, resetTtl);\n}\n"],"names":["LRU","constructor","max","ttl","resetTtl","this","first","items","Object","create","last","size","clear","key","has","item","prev","next","entries","keys","result","Array","length","i","get","evict","bypass","expiresAt","expiry","undefined","Date","now","delete","moveToEnd","value","x","setWithEvicted","evicted","set","values","lru","isNaN","TypeError"],"mappings":";;;;AAkBO,MAAMA,EAcZ,WAAAC,CAAaC,EAAM,EAAGC,EAAM,EAAGC,GAAW,GACzCC,KAAKC,MAAQ,KACbD,KAAKE,MAAQC,OAAOC,OAAO,MAC3BJ,KAAKK,KAAO,KACZL,KAAKH,IAAMA,EACXG,KAAKD,SAAWA,EAChBC,KAAKM,KAAO,EACZN,KAAKF,IAAMA,CACZ,CAaA,KAAAS,GAMC,OALAP,KAAKC,MAAQ,KACbD,KAAKE,MAAQC,OAAOC,OAAO,MAC3BJ,KAAKK,KAAO,KACZL,KAAKM,KAAO,EAELN,IACR,CAiBA,OAAQQ,GACP,GAAIR,KAAKS,IAAID,GAAM,CAClB,MAAME,EAAOV,KAAKE,MAAMM,UAEjBR,KAAKE,MAAMM,GAClBR,KAAKM,OAEa,OAAdI,EAAKC,OACRD,EAAKC,KAAKC,KAAOF,EAAKE,MAGL,OAAdF,EAAKE,OACRF,EAAKE,KAAKD,KAAOD,EAAKC,MAGnBX,KAAKC,QAAUS,IAClBV,KAAKC,MAAQS,EAAKE,MAGfZ,KAAKK,OAASK,IACjBV,KAAKK,KAAOK,EAAKC,KAEnB,CAEA,OAAOX,IACR,CAkBA,OAAAa,CAASC,EAAOd,KAAKc,QACpB,MAAMC,EAAS,IAAIC,MAAMF,EAAKG,QAC9B,IAAK,IAAIC,EAAI,EAAGA,EAAIJ,EAAKG,OAAQC,IAAK,CACrC,MAAMV,EAAMM,EAAKI,GACjBH,EAAOG,GAAK,CAACV,EAAKR,KAAKmB,IAAIX,GAC5B,CAEA,OAAOO,CACR,CAeA,KAAAK,CAAOC,GAAS,GACf,GAAIA,GAAUrB,KAAKM,KAAO,EAAG,CAC5B,MAAMI,EAAOV,KAAKC,aAEXD,KAAKE,MAAMQ,EAAKF,KAEH,KAAdR,KAAKM,MACVN,KAAKC,MAAQ,KACbD,KAAKK,KAAO,OAEZL,KAAKC,MAAQS,EAAKE,KAClBZ,KAAKC,MAAMU,KAAO,KAEpB,CAEA,OAAOX,IACR,CAiBA,SAAAsB,CAAWd,GACV,IAAIO,EAMJ,OAJIf,KAAKS,IAAID,KACZO,EAASf,KAAKE,MAAMM,GAAKe,QAGnBR,CACR,CAiBA,GAAAI,CAAKX,GACJ,MAAME,EAAOV,KAAKE,MAAMM,GAExB,QAAagB,IAATd,EAEH,OAAIV,KAAKF,IAAM,GACVY,EAAKa,QAAUE,KAAKC,WACvB1B,KAAK2B,OAAOnB,IAOdR,KAAK4B,UAAUlB,GAERA,EAAKmB,MAId,CAiBA,GAAApB,CAAKD,GACJ,OAAOA,KAAOR,KAAKE,KACpB,CAaA,SAAA0B,CAAWlB,GAENV,KAAKK,OAASK,IAKA,OAAdA,EAAKC,OACRD,EAAKC,KAAKC,KAAOF,EAAKE,MAGL,OAAdF,EAAKE,OACRF,EAAKE,KAAKD,KAAOD,EAAKC,MAInBX,KAAKC,QAAUS,IAClBV,KAAKC,MAAQS,EAAKE,MAInBF,EAAKC,KAAOX,KAAKK,KACjBK,EAAKE,KAAO,KAEM,OAAdZ,KAAKK,OACRL,KAAKK,KAAKO,KAAOF,GAGlBV,KAAKK,KAAOK,EAGO,OAAfV,KAAKC,QACRD,KAAKC,MAAQS,GAEf,CAgBA,IAAAI,GACC,MAAMC,EAAS,IAAIC,MAAMhB,KAAKM,MAC9B,IAAIwB,EAAI9B,KAAKC,MACTiB,EAAI,EAER,KAAa,OAANY,GACNf,EAAOG,KAAOY,EAAEtB,IAChBsB,EAAIA,EAAElB,KAGP,OAAOG,CACR,CAmBA,cAAAgB,CAAgBvB,EAAKqB,EAAO9B,EAAWC,KAAKD,UAC3C,IAAIiC,EAAU,KAEd,GAAIhC,KAAKS,IAAID,GACZR,KAAKiC,IAAIzB,EAAKqB,GAAO,EAAM9B,OACrB,CACFC,KAAKH,IAAM,GAAKG,KAAKM,OAASN,KAAKH,MACtCmC,EAAU,IAAIhC,KAAKC,OACnBD,KAAKoB,OAAM,IAGZ,IAAIV,EAAOV,KAAKE,MAAMM,GAAO,CAC5Be,OAAQvB,KAAKF,IAAM,EAAI2B,KAAKC,MAAQ1B,KAAKF,IAAME,KAAKF,IACpDU,IAAKA,EACLG,KAAMX,KAAKK,KACXO,KAAM,KACNiB,SAGmB,KAAd7B,KAAKM,KACVN,KAAKC,MAAQS,EAEbV,KAAKK,KAAKO,KAAOF,EAGlBV,KAAKK,KAAOK,CACb,CAEA,OAAOsB,CACR,CAoBA,GAAAC,CAAKzB,EAAKqB,EAAOR,GAAS,EAAOtB,EAAWC,KAAKD,UAChD,IAAIW,EAAOV,KAAKE,MAAMM,GAmCtB,OAjCIa,QAAmBG,IAATd,GAEbA,EAAKmB,MAAQA,GAEE,IAAXR,GAAoBtB,IACvBW,EAAKa,OAASvB,KAAKF,IAAM,EAAI2B,KAAKC,MAAQ1B,KAAKF,IAAME,KAAKF,KAI3DE,KAAK4B,UAAUlB,KAGXV,KAAKH,IAAM,GAAKG,KAAKM,OAASN,KAAKH,KACtCG,KAAKoB,OAAM,GAGZV,EAAOV,KAAKE,MAAMM,GAAO,CACxBe,OAAQvB,KAAKF,IAAM,EAAI2B,KAAKC,MAAQ1B,KAAKF,IAAME,KAAKF,IACpDU,IAAKA,EACLG,KAAMX,KAAKK,KACXO,KAAM,KACNiB,SAGmB,KAAd7B,KAAKM,KACVN,KAAKC,MAAQS,EAEbV,KAAKK,KAAKO,KAAOF,EAGlBV,KAAKK,KAAOK,GAGNV,IACR,CAkBA,MAAAkC,CAAQpB,EAAOd,KAAKc,QACnB,MAAMC,EAAS,IAAIC,MAAMF,EAAKG,QAC9B,IAAK,IAAIC,EAAI,EAAGA,EAAIJ,EAAKG,OAAQC,IAChCH,EAAOG,GAAKlB,KAAKmB,IAAIL,EAAKI,IAG3B,OAAOH,CACR,EA2BM,SAASoB,EAAKtC,EAAM,IAAMC,EAAM,EAAGC,GAAW,GACpD,GAAIqC,MAAMvC,IAAQA,EAAM,EACvB,MAAM,IAAIwC,UAAU,qBAGrB,GAAID,MAAMtC,IAAQA,EAAM,EACvB,MAAM,IAAIuC,UAAU,qBAGrB,GAAwB,kBAAbtC,EACV,MAAM,IAAIsC,UAAU,0BAGrB,OAAO,IAAI1C,EAAIE,EAAKC,EAAKC,EAC1B,QAAAJ,SAAAwC"} \ No newline at end of file +{"version":3,"file":"tiny-lru.min.js","sources":["../src/lru.js"],"sourcesContent":["/**\n * A high-performance Least Recently Used (LRU) cache implementation with optional TTL support.\n * Items are automatically evicted when the cache reaches its maximum size,\n * removing the least recently used items first. All core operations (get, set, delete) are O(1).\n *\n * @class LRU\n * @example\n * // Create a cache with max 100 items\n * const cache = new LRU(100);\n * cache.set('key1', 'value1');\n * console.log(cache.get('key1')); // 'value1'\n *\n * @example\n * // Create a cache with TTL\n * const cache = new LRU(100, 5000); // 5 second TTL\n * cache.set('key1', 'value1');\n * // After 5 seconds, key1 will be expired\n */\nexport class LRU {\n\t/**\n\t * Creates a new LRU cache instance.\n\t * Note: Constructor does not validate parameters. Use lru() factory function for parameter validation.\n\t *\n\t * @constructor\n\t * @param {number} [max=0] - Maximum number of items to store. 0 means unlimited.\n\t * @param {number} [ttl=0] - Time to live in milliseconds. 0 means no expiration.\n\t * @param {boolean} [resetTtl=false] - Whether to reset TTL when accessing existing items via get().\n\t * @example\n\t * const cache = new LRU(1000, 60000, true); // 1000 items, 1 minute TTL, reset on access\n\t * @see {@link lru} For parameter validation\n\t * @since 1.0.0\n\t */\n\tconstructor (max = 0, ttl = 0, resetTtl = false) {\n\t\tthis.first = null;\n\t\tthis.items = Object.create(null);\n\t\tthis.last = null;\n\t\tthis.max = max;\n\t\tthis.resetTtl = resetTtl;\n\t\tthis.size = 0;\n\t\tthis.ttl = ttl;\n\t}\n\n\t/**\n\t * Removes all items from the cache.\n\t *\n\t * @method clear\n\t * @memberof LRU\n\t * @returns {LRU} The LRU instance for method chaining.\n\t * @example\n\t * cache.clear();\n\t * console.log(cache.size); // 0\n\t * @since 1.0.0\n\t */\n\tclear () {\n\t\tthis.first = null;\n\t\tthis.items = Object.create(null);\n\t\tthis.last = null;\n\t\tthis.size = 0;\n\n\t\treturn this;\n\t}\n\n\t/**\n\t * Removes an item from the cache by key.\n\t *\n\t * @method delete\n\t * @memberof LRU\n\t * @param {string} key - The key of the item to delete.\n\t * @returns {LRU} The LRU instance for method chaining.\n\t * @example\n\t * cache.set('key1', 'value1');\n\t * cache.delete('key1');\n\t * console.log(cache.has('key1')); // false\n\t * @see {@link LRU#has}\n\t * @see {@link LRU#clear}\n\t * @since 1.0.0\n\t */\n\tdelete (key) {\n\t\tconst item = this.items[key];\n\n\t\tif (item !== undefined) {\n\t\t\tdelete this.items[key];\n\t\t\tthis.size--;\n\n\t\t\tif (item.prev !== null) {\n\t\t\t\titem.prev.next = item.next;\n\t\t\t}\n\n\t\t\tif (item.next !== null) {\n\t\t\t\titem.next.prev = item.prev;\n\t\t\t}\n\n\t\t\tif (this.first === item) {\n\t\t\t\tthis.first = item.next;\n\t\t\t}\n\n\t\t\tif (this.last === item) {\n\t\t\t\tthis.last = item.prev;\n\t\t\t}\n\n\t\t\titem.prev = null;\n\t\t\titem.next = null;\n\t\t}\n\n\t\treturn this;\n\t}\n\n\t/**\n\t * Returns an array of [key, value] pairs for the specified keys.\n\t * Order follows LRU order (least to most recently used).\n\t *\n\t * @method entries\n\t * @memberof LRU\n\t * @param {string[]} [keys=this.keys()] - Array of keys to get entries for. Defaults to all keys.\n\t * @returns {Array>} Array of [key, value] pairs in LRU order.\n\t * @example\n\t * cache.set('a', 1).set('b', 2);\n\t * console.log(cache.entries()); // [['a', 1], ['b', 2]]\n\t * console.log(cache.entries(['a'])); // [['a', 1]]\n\t * @see {@link LRU#keys}\n\t * @see {@link LRU#values}\n\t * @since 11.1.0\n\t */\n\tentries (keys) {\n\t\tif (keys === undefined) {\n\t\t\tkeys = this.keys();\n\t\t}\n\n\t\tconst result = Array.from({ length: keys.length });\n\t\tfor (let i = 0; i < keys.length; i++) {\n\t\t\tconst key = keys[i];\n\t\t\tconst item = this.items[key];\n\t\t\tresult[i] = [key, item !== undefined ? item.value : undefined];\n\t\t}\n\n\t\treturn result;\n\t}\n\n\t/**\n\t * Removes the least recently used item from the cache.\n\t *\n\t * @method evict\n\t * @memberof LRU\n\t * @param {boolean} [bypass=false] - Whether to force eviction even when cache is empty.\n\t * @returns {LRU} The LRU instance for method chaining.\n\t * @example\n\t * cache.set('old', 'value').set('new', 'value');\n\t * cache.evict(); // Removes 'old' item\n\t * @see {@link LRU#setWithEvicted}\n\t * @since 1.0.0\n\t */\n\tevict (bypass = false) {\n\t\tif (bypass || this.size > 0) {\n\t\t\tconst item = this.first;\n\n\t\t\tif (!item) {\n\t\t\t\treturn this;\n\t\t\t}\n\n\t\t\tdelete this.items[item.key];\n\n\t\t\tif (--this.size === 0) {\n\t\t\t\tthis.first = null;\n\t\t\t\tthis.last = null;\n\t\t\t} else {\n\t\t\t\tthis.first = item.next;\n\t\t\t\tthis.first.prev = null;\n\t\t\t}\n\n\t\t\titem.next = null;\n\t\t}\n\n\t\treturn this;\n\t}\n\n\t/**\n\t * Returns the expiration timestamp for a given key.\n\t *\n\t * @method expiresAt\n\t * @memberof LRU\n\t * @param {string} key - The key to check expiration for.\n\t * @returns {number|undefined} The expiration timestamp in milliseconds, or undefined if key doesn't exist.\n\t * @example\n\t * const cache = new LRU(100, 5000); // 5 second TTL\n\t * cache.set('key1', 'value1');\n\t * console.log(cache.expiresAt('key1')); // timestamp 5 seconds from now\n\t * @see {@link LRU#get}\n\t * @see {@link LRU#has}\n\t * @since 1.0.0\n\t */\n\texpiresAt (key) {\n\t\tconst item = this.items[key];\n\t\treturn item !== undefined ? item.expiry : undefined;\n\t}\n\n\t/**\n\t * Retrieves a value from the cache by key. Updates the item's position to most recently used.\n\t *\n\t * @method get\n\t * @memberof LRU\n\t * @param {string} key - The key to retrieve.\n\t * @returns {*} The value associated with the key, or undefined if not found or expired.\n\t * @example\n\t * cache.set('key1', 'value1');\n\t * console.log(cache.get('key1')); // 'value1'\n\t * console.log(cache.get('nonexistent')); // undefined\n\t * @see {@link LRU#set}\n\t * @see {@link LRU#has}\n\t * @since 1.0.0\n\t */\n\tget (key) {\n\t\tconst item = this.items[key];\n\n\t\tif (item !== undefined) {\n\t\t\t// Check TTL only if enabled to avoid unnecessary Date.now() calls\n\t\t\tif (this.ttl > 0) {\n\t\t\t\tif (item.expiry <= Date.now()) {\n\t\t\t\t\tthis.delete(key);\n\n\t\t\t\t\treturn undefined;\n\t\t\t\t}\n\t\t\t}\n\n\t\t\t// Fast LRU update without full set() overhead\n\t\t\tthis.moveToEnd(item);\n\n\t\t\treturn item.value;\n\t\t}\n\n\t\treturn undefined;\n\t}\n\n\t/**\n\t * Checks if a key exists in the cache.\n\t *\n\t * @method has\n\t * @memberof LRU\n\t * @param {string} key - The key to check for.\n\t * @returns {boolean} True if the key exists, false otherwise.\n\t * @example\n\t * cache.set('key1', 'value1');\n\t * console.log(cache.has('key1')); // true\n\t * console.log(cache.has('nonexistent')); // false\n\t * @see {@link LRU#get}\n\t * @see {@link LRU#delete}\n\t * @since 9.0.0\n\t */\n\thas (key) {\n\t\tconst item = this.items[key];\n\t\treturn item !== undefined && (this.ttl === 0 || item.expiry > Date.now());\n\t}\n\n\t/**\n\t * Efficiently moves an item to the end of the LRU list (most recently used position).\n\t * This is an internal optimization method that avoids the overhead of the full set() operation\n\t * when only LRU position needs to be updated.\n\t *\n\t * @method moveToEnd\n\t * @memberof LRU\n\t * @param {Object} item - The cache item with prev/next pointers to reposition.\n\t * @private\n\t * @since 11.3.5\n\t */\n\tmoveToEnd (item) {\n\t\tif (this.last === item) {\n\t\t\treturn;\n\t\t}\n\n\t\tif (item.prev !== null) {\n\t\t\titem.prev.next = item.next;\n\t\t}\n\n\t\tif (item.next !== null) {\n\t\t\titem.next.prev = item.prev;\n\t\t}\n\n\t\tif (this.first === item) {\n\t\t\tthis.first = item.next;\n\t\t}\n\n\t\titem.prev = this.last;\n\t\titem.next = null;\n\n\t\tif (this.last !== null) {\n\t\t\tthis.last.next = item;\n\t\t}\n\n\t\tthis.last = item;\n\t}\n\n\t/**\n\t * Returns an array of all keys in the cache, ordered from least to most recently used.\n\t *\n\t * @method keys\n\t * @memberof LRU\n\t * @returns {string[]} Array of keys in LRU order.\n\t * @example\n\t * cache.set('a', 1).set('b', 2);\n\t * cache.get('a'); // Move 'a' to most recent\n\t * console.log(cache.keys()); // ['b', 'a']\n\t * @see {@link LRU#values}\n\t * @see {@link LRU#entries}\n\t * @since 9.0.0\n\t */\n\tkeys () {\n\t\tconst result = Array.from({ length: this.size });\n\t\tlet x = this.first;\n\t\tlet i = 0;\n\n\t\twhile (x !== null) {\n\t\t\tresult[i++] = x.key;\n\t\t\tx = x.next;\n\t\t}\n\n\t\treturn result;\n\t}\n\n\t/**\n\t * Sets a value in the cache and returns any evicted item.\n\t *\n\t * @method setWithEvicted\n\t * @memberof LRU\n\t * @param {string} key - The key to set.\n\t * @param {*} value - The value to store.\n\t * @param {boolean} [resetTtl=this.resetTtl] - Whether to reset the TTL for this operation.\n\t * @returns {Object|null} The evicted item (if any) with shape {key, value, expiry, prev, next}, or null.\n\t * @example\n\t * const cache = new LRU(2);\n\t * cache.set('a', 1).set('b', 2);\n\t * const evicted = cache.setWithEvicted('c', 3); // evicted = {key: 'a', value: 1, ...}\n\t * @see {@link LRU#set}\n\t * @see {@link LRU#evict}\n\t * @since 11.3.0\n\t */\n\tsetWithEvicted (key, value, resetTtl = this.resetTtl) {\n\t\tlet evicted = null;\n\t\tlet item = this.items[key];\n\n\t\tif (item !== undefined) {\n\t\t\titem.value = value;\n\t\t\tif (resetTtl) {\n\t\t\t\titem.expiry = this.ttl > 0 ? Date.now() + this.ttl : this.ttl;\n\t\t\t}\n\t\t\tthis.moveToEnd(item);\n\t\t} else {\n\t\t\tif (this.max > 0 && this.size === this.max) {\n\t\t\t\tevicted = {\n\t\t\t\t\tkey: this.first.key,\n\t\t\t\t\tvalue: this.first.value,\n\t\t\t\t\texpiry: this.first.expiry\n\t\t\t\t};\n\t\t\t\tthis.evict(true);\n\t\t\t}\n\n\t\t\titem = this.items[key] = {\n\t\t\t\texpiry: this.ttl > 0 ? Date.now() + this.ttl : this.ttl,\n\t\t\t\tkey: key,\n\t\t\t\tprev: this.last,\n\t\t\t\tnext: null,\n\t\t\t\tvalue\n\t\t\t};\n\n\t\t\tif (++this.size === 1) {\n\t\t\t\tthis.first = item;\n\t\t\t} else {\n\t\t\t\tthis.last.next = item;\n\t\t\t}\n\n\t\t\tthis.last = item;\n\t\t}\n\n\t\treturn evicted;\n\t}\n\n\t/**\n\t * Sets a value in the cache. Updates the item's position to most recently used.\n\t *\n\t * @method set\n\t * @memberof LRU\n\t * @param {string} key - The key to set.\n\t * @param {*} value - The value to store.\n\t * @param {boolean} [bypass=false] - Internal parameter for setWithEvicted method.\n\t * @param {boolean} [resetTtl=this.resetTtl] - Whether to reset the TTL for this operation.\n\t * @returns {LRU} The LRU instance for method chaining.\n\t * @example\n\t * cache.set('key1', 'value1')\n\t * .set('key2', 'value2')\n\t * .set('key3', 'value3');\n\t * @see {@link LRU#get}\n\t * @see {@link LRU#setWithEvicted}\n\t * @since 1.0.0\n\t */\n\tset (key, value, bypass = false, resetTtl = this.resetTtl) {\n\t\tlet item = this.items[key];\n\n\t\tif (bypass || item !== undefined) {\n\t\t\t// Existing item: update value and position\n\t\t\titem.value = value;\n\n\t\t\tif (bypass === false && resetTtl) {\n\t\t\t\titem.expiry = this.ttl > 0 ? Date.now() + this.ttl : this.ttl;\n\t\t\t}\n\n\t\t\t// Always move to end, but the bypass parameter affects TTL reset behavior\n\t\t\tthis.moveToEnd(item);\n\t\t} else {\n\t\t\t// New item: check for eviction and create\n\t\t\tif (this.max > 0 && this.size === this.max) {\n\t\t\t\tthis.evict(true);\n\t\t\t}\n\n\t\t\titem = this.items[key] = {\n\t\t\t\texpiry: this.ttl > 0 ? Date.now() + this.ttl : this.ttl,\n\t\t\t\tkey: key,\n\t\t\t\tprev: this.last,\n\t\t\t\tnext: null,\n\t\t\t\tvalue\n\t\t\t};\n\n\t\t\tif (++this.size === 1) {\n\t\t\t\tthis.first = item;\n\t\t\t} else {\n\t\t\t\tthis.last.next = item;\n\t\t\t}\n\n\t\t\tthis.last = item;\n\t\t}\n\n\t\treturn this;\n\t}\n\n\t/**\n\t * Returns an array of all values in the cache for the specified keys.\n\t * Order follows LRU order (least to most recently used).\n\t *\n\t * @method values\n\t * @memberof LRU\n\t * @param {string[]} [keys=this.keys()] - Array of keys to get values for. Defaults to all keys.\n\t * @returns {Array<*>} Array of values corresponding to the keys in LRU order.\n\t * @example\n\t * cache.set('a', 1).set('b', 2);\n\t * console.log(cache.values()); // [1, 2]\n\t * console.log(cache.values(['a'])); // [1]\n\t * @see {@link LRU#keys}\n\t * @see {@link LRU#entries}\n\t * @since 11.1.0\n\t */\n\tvalues (keys) {\n\t\tif (keys === undefined) {\n\t\t\tkeys = this.keys();\n\t\t}\n\n\t\tconst result = Array.from({ length: keys.length });\n\t\tfor (let i = 0; i < keys.length; i++) {\n\t\t\tconst item = this.items[keys[i]];\n\t\t\tresult[i] = item !== undefined ? item.value : undefined;\n\t\t}\n\n\t\treturn result;\n\t}\n}\n\n/**\n * Factory function to create a new LRU cache instance with parameter validation.\n *\n * @function lru\n * @param {number} [max=1000] - Maximum number of items to store. Must be >= 0. Use 0 for unlimited size.\n * @param {number} [ttl=0] - Time to live in milliseconds. Must be >= 0. Use 0 for no expiration.\n * @param {boolean} [resetTtl=false] - Whether to reset TTL when accessing existing items via get().\n * @returns {LRU} A new LRU cache instance.\n * @throws {TypeError} When parameters are invalid (negative numbers or wrong types).\n * @example\n * // Create cache with factory function\n * const cache = lru(100, 5000, true);\n * cache.set('key', 'value');\n *\n * @example\n * // Error handling\n * try {\n * const cache = lru(-1); // Invalid max\n * } catch (error) {\n * console.error(error.message); // \"Invalid max value\"\n * }\n * @see {@link LRU}\n * @since 1.0.0\n */\nexport function lru (max = 1000, ttl = 0, resetTtl = false) {\n\tif (isNaN(max) || max < 0) {\n\t\tthrow new TypeError(\"Invalid max value\");\n\t}\n\n\tif (isNaN(ttl) || ttl < 0) {\n\t\tthrow new TypeError(\"Invalid ttl value\");\n\t}\n\n\tif (typeof resetTtl !== \"boolean\") {\n\t\tthrow new TypeError(\"Invalid resetTtl value\");\n\t}\n\n\treturn new LRU(max, ttl, 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\ No newline at end of file diff --git a/dist/tiny-lru.umd.js b/dist/tiny-lru.umd.js index 9222cf9..a001c1e 100644 --- a/dist/tiny-lru.umd.js +++ b/dist/tiny-lru.umd.js @@ -83,9 +83,9 @@ class LRU { * @since 1.0.0 */ delete (key) { - if (this.has(key)) { - const item = this.items[key]; + const item = this.items[key]; + if (item !== undefined) { delete this.items[key]; this.size--; @@ -104,6 +104,9 @@ class LRU { if (this.last === item) { this.last = item.prev; } + + item.prev = null; + item.next = null; } return this; @@ -125,11 +128,16 @@ class LRU { * @see {@link LRU#values} * @since 11.1.0 */ - entries (keys = this.keys()) { - const result = new Array(keys.length); + entries (keys) { + if (keys === undefined) { + keys = this.keys(); + } + + const result = Array.from({ length: keys.length }); for (let i = 0; i < keys.length; i++) { const key = keys[i]; - result[i] = [key, this.get(key)]; + const item = this.items[key]; + result[i] = [key, item !== undefined ? item.value : undefined]; } return result; @@ -152,6 +160,10 @@ class LRU { if (bypass || this.size > 0) { const item = this.first; + if (!item) { + return this; + } + delete this.items[item.key]; if (--this.size === 0) { @@ -161,6 +173,8 @@ class LRU { this.first = item.next; this.first.prev = null; } + + item.next = null; } return this; @@ -182,13 +196,8 @@ class LRU { * @since 1.0.0 */ expiresAt (key) { - let result; - - if (this.has(key)) { - result = this.items[key].expiry; - } - - return result; + const item = this.items[key]; + return item !== undefined ? item.expiry : undefined; } /** @@ -244,7 +253,8 @@ class LRU { * @since 9.0.0 */ has (key) { - return key in this.items; + const item = this.items[key]; + return item !== undefined && (this.ttl === 0 || item.expiry > Date.now()); } /** @@ -259,12 +269,10 @@ class LRU { * @since 11.3.5 */ moveToEnd (item) { - // If already at the end, nothing to do if (this.last === item) { return; } - // Remove item from current position in the list if (item.prev !== null) { item.prev.next = item.next; } @@ -273,12 +281,10 @@ class LRU { item.next.prev = item.prev; } - // Update first pointer if this was the first item if (this.first === item) { this.first = item.next; } - // Add item to the end item.prev = this.last; item.next = null; @@ -287,11 +293,6 @@ class LRU { } this.last = item; - - // Handle edge case: if this was the only item, it's also first - if (this.first === null) { - this.first = item; - } } /** @@ -309,7 +310,7 @@ class LRU { * @since 9.0.0 */ keys () { - const result = new Array(this.size); + const result = Array.from({ length: this.size }); let x = this.first; let i = 0; @@ -340,16 +341,25 @@ class LRU { */ setWithEvicted (key, value, resetTtl = this.resetTtl) { let evicted = null; + let item = this.items[key]; - if (this.has(key)) { - this.set(key, value, true, resetTtl); + if (item !== undefined) { + item.value = value; + if (resetTtl) { + item.expiry = this.ttl > 0 ? Date.now() + this.ttl : this.ttl; + } + this.moveToEnd(item); } else { if (this.max > 0 && this.size === this.max) { - evicted = {...this.first}; + evicted = { + key: this.first.key, + value: this.first.value, + expiry: this.first.expiry + }; this.evict(true); } - let item = this.items[key] = { + item = this.items[key] = { expiry: this.ttl > 0 ? Date.now() + this.ttl : this.ttl, key: key, prev: this.last, @@ -442,10 +452,15 @@ class LRU { * @see {@link LRU#entries} * @since 11.1.0 */ - values (keys = this.keys()) { - const result = new Array(keys.length); + values (keys) { + if (keys === undefined) { + keys = this.keys(); + } + + const result = Array.from({ length: keys.length }); for (let i = 0; i < keys.length; i++) { - result[i] = this.get(keys[i]); + const item = this.items[keys[i]]; + result[i] = item !== undefined ? item.value : undefined; } return result; diff --git a/dist/tiny-lru.umd.min.js b/dist/tiny-lru.umd.min.js index 8406124..5a78544 100644 --- a/dist/tiny-lru.umd.min.js +++ b/dist/tiny-lru.umd.min.js @@ -2,4 +2,4 @@ 2026 Jason Mulligan @version 11.4.7 */ -!function(t,s){"object"==typeof exports&&"undefined"!=typeof module?s(exports):"function"==typeof define&&define.amd?define(["exports"],s):s((t="undefined"!=typeof globalThis?globalThis:t||self).lru={})}(this,(function(t){"use strict";class s{constructor(t=0,s=0,e=!1){this.first=null,this.items=Object.create(null),this.last=null,this.max=t,this.resetTtl=e,this.size=0,this.ttl=s}clear(){return this.first=null,this.items=Object.create(null),this.last=null,this.size=0,this}delete(t){if(this.has(t)){const s=this.items[t];delete this.items[t],this.size--,null!==s.prev&&(s.prev.next=s.next),null!==s.next&&(s.next.prev=s.prev),this.first===s&&(this.first=s.next),this.last===s&&(this.last=s.prev)}return this}entries(t=this.keys()){const s=new Array(t.length);for(let e=0;e0){const t=this.first;delete this.items[t.key],0==--this.size?(this.first=null,this.last=null):(this.first=t.next,this.first.prev=null)}return this}expiresAt(t){let s;return this.has(t)&&(s=this.items[t].expiry),s}get(t){const s=this.items[t];if(void 0!==s)return this.ttl>0&&s.expiry<=Date.now()?void this.delete(t):(this.moveToEnd(s),s.value)}has(t){return t in this.items}moveToEnd(t){this.last!==t&&(null!==t.prev&&(t.prev.next=t.next),null!==t.next&&(t.next.prev=t.prev),this.first===t&&(this.first=t.next),t.prev=this.last,t.next=null,null!==this.last&&(this.last.next=t),this.last=t,null===this.first&&(this.first=t))}keys(){const t=new Array(this.size);let s=this.first,e=0;for(;null!==s;)t[e++]=s.key,s=s.next;return t}setWithEvicted(t,s,e=this.resetTtl){let i=null;if(this.has(t))this.set(t,s,!0,e);else{this.max>0&&this.size===this.max&&(i={...this.first},this.evict(!0));let e=this.items[t]={expiry:this.ttl>0?Date.now()+this.ttl:this.ttl,key:t,prev:this.last,next:null,value:s};1==++this.size?this.first=e:this.last.next=e,this.last=e}return i}set(t,s,e=!1,i=this.resetTtl){let l=this.items[t];return e||void 0!==l?(l.value=s,!1===e&&i&&(l.expiry=this.ttl>0?Date.now()+this.ttl:this.ttl),this.moveToEnd(l)):(this.max>0&&this.size===this.max&&this.evict(!0),l=this.items[t]={expiry:this.ttl>0?Date.now()+this.ttl:this.ttl,key:t,prev:this.last,next:null,value:s},1==++this.size?this.first=l:this.last.next=l,this.last=l),this}values(t=this.keys()){const s=new Array(t.length);for(let e=0;e0){const t=this.first;if(!t)return this;delete this.items[t.key],0==--this.size?(this.first=null,this.last=null):(this.first=t.next,this.first.prev=null),t.next=null}return this}expiresAt(t){const e=this.items[t];return void 0!==e?e.expiry:void 0}get(t){const e=this.items[t];if(void 0!==e)return this.ttl>0&&e.expiry<=Date.now()?void this.delete(t):(this.moveToEnd(e),e.value)}has(t){const e=this.items[t];return void 0!==e&&(0===this.ttl||e.expiry>Date.now())}moveToEnd(t){this.last!==t&&(null!==t.prev&&(t.prev.next=t.next),null!==t.next&&(t.next.prev=t.prev),this.first===t&&(this.first=t.next),t.prev=this.last,t.next=null,null!==this.last&&(this.last.next=t),this.last=t)}keys(){const t=Array.from({length:this.size});let e=this.first,i=0;for(;null!==e;)t[i++]=e.key,e=e.next;return t}setWithEvicted(t,e,i=this.resetTtl){let s=null,l=this.items[t];return void 0!==l?(l.value=e,i&&(l.expiry=this.ttl>0?Date.now()+this.ttl:this.ttl),this.moveToEnd(l)):(this.max>0&&this.size===this.max&&(s={key:this.first.key,value:this.first.value,expiry:this.first.expiry},this.evict(!0)),l=this.items[t]={expiry:this.ttl>0?Date.now()+this.ttl:this.ttl,key:t,prev:this.last,next:null,value:e},1==++this.size?this.first=l:this.last.next=l,this.last=l),s}set(t,e,i=!1,s=this.resetTtl){let l=this.items[t];return i||void 0!==l?(l.value=e,!1===i&&s&&(l.expiry=this.ttl>0?Date.now()+this.ttl:this.ttl),this.moveToEnd(l)):(this.max>0&&this.size===this.max&&this.evict(!0),l=this.items[t]={expiry:this.ttl>0?Date.now()+this.ttl:this.ttl,key:t,prev:this.last,next:null,value:e},1==++this.size?this.first=l:this.last.next=l,this.last=l),this}values(t){void 0===t&&(t=this.keys());const e=Array.from({length:t.length});for(let i=0;i>} Array of [key, value] pairs in LRU order.\n\t * @example\n\t * cache.set('a', 1).set('b', 2);\n\t * console.log(cache.entries()); // [['a', 1], ['b', 2]]\n\t * console.log(cache.entries(['a'])); // [['a', 1]]\n\t * @see {@link LRU#keys}\n\t * @see {@link LRU#values}\n\t * @since 11.1.0\n\t */\n\tentries (keys = this.keys()) {\n\t\tconst result = new Array(keys.length);\n\t\tfor (let i = 0; i < keys.length; i++) {\n\t\t\tconst key = keys[i];\n\t\t\tresult[i] = [key, this.get(key)];\n\t\t}\n\n\t\treturn result;\n\t}\n\n\t/**\n\t * Removes the least recently used item from the cache.\n\t *\n\t * @method evict\n\t * @memberof LRU\n\t * @param {boolean} [bypass=false] - Whether to force eviction even when cache is empty.\n\t * @returns {LRU} The LRU instance for method chaining.\n\t * @example\n\t * cache.set('old', 'value').set('new', 'value');\n\t * cache.evict(); // Removes 'old' item\n\t * @see {@link LRU#setWithEvicted}\n\t * @since 1.0.0\n\t */\n\tevict (bypass = false) {\n\t\tif (bypass || this.size > 0) {\n\t\t\tconst item = this.first;\n\n\t\t\tdelete this.items[item.key];\n\n\t\t\tif (--this.size === 0) {\n\t\t\t\tthis.first = null;\n\t\t\t\tthis.last = null;\n\t\t\t} else {\n\t\t\t\tthis.first = item.next;\n\t\t\t\tthis.first.prev = null;\n\t\t\t}\n\t\t}\n\n\t\treturn this;\n\t}\n\n\t/**\n\t * Returns the expiration timestamp for a given key.\n\t *\n\t * @method expiresAt\n\t * @memberof LRU\n\t * @param {string} key - The key to check expiration for.\n\t * @returns {number|undefined} The expiration timestamp in milliseconds, or undefined if key doesn't exist.\n\t * @example\n\t * const cache = new LRU(100, 5000); // 5 second TTL\n\t * cache.set('key1', 'value1');\n\t * console.log(cache.expiresAt('key1')); // timestamp 5 seconds from now\n\t * @see {@link LRU#get}\n\t * @see {@link LRU#has}\n\t * @since 1.0.0\n\t */\n\texpiresAt (key) {\n\t\tlet result;\n\n\t\tif (this.has(key)) {\n\t\t\tresult = this.items[key].expiry;\n\t\t}\n\n\t\treturn result;\n\t}\n\n\t/**\n\t * Retrieves a value from the cache by key. Updates the item's position to most recently used.\n\t *\n\t * @method get\n\t * @memberof LRU\n\t * @param {string} key - The key to retrieve.\n\t * @returns {*} The value associated with the key, or undefined if not found or expired.\n\t * @example\n\t * cache.set('key1', 'value1');\n\t * console.log(cache.get('key1')); // 'value1'\n\t * console.log(cache.get('nonexistent')); // undefined\n\t * @see {@link LRU#set}\n\t * @see {@link LRU#has}\n\t * @since 1.0.0\n\t */\n\tget (key) {\n\t\tconst item = this.items[key];\n\n\t\tif (item !== undefined) {\n\t\t\t// Check TTL only if enabled to avoid unnecessary Date.now() calls\n\t\t\tif (this.ttl > 0) {\n\t\t\t\tif (item.expiry <= Date.now()) {\n\t\t\t\t\tthis.delete(key);\n\n\t\t\t\t\treturn undefined;\n\t\t\t\t}\n\t\t\t}\n\n\t\t\t// Fast LRU update without full set() overhead\n\t\t\tthis.moveToEnd(item);\n\n\t\t\treturn item.value;\n\t\t}\n\n\t\treturn undefined;\n\t}\n\n\t/**\n\t * Checks if a key exists in the cache.\n\t *\n\t * @method has\n\t * @memberof LRU\n\t * @param {string} key - The key to check for.\n\t * @returns {boolean} True if the key exists, false otherwise.\n\t * @example\n\t * cache.set('key1', 'value1');\n\t * console.log(cache.has('key1')); // true\n\t * console.log(cache.has('nonexistent')); // false\n\t * @see {@link LRU#get}\n\t * @see {@link LRU#delete}\n\t * @since 9.0.0\n\t */\n\thas (key) {\n\t\treturn key in this.items;\n\t}\n\n\t/**\n\t * Efficiently moves an item to the end of the LRU list (most recently used position).\n\t * This is an internal optimization method that avoids the overhead of the full set() operation\n\t * when only LRU position needs to be updated.\n\t *\n\t * @method moveToEnd\n\t * @memberof LRU\n\t * @param {Object} item - The cache item with prev/next pointers to reposition.\n\t * @private\n\t * @since 11.3.5\n\t */\n\tmoveToEnd (item) {\n\t\t// If already at the end, nothing to do\n\t\tif (this.last === item) {\n\t\t\treturn;\n\t\t}\n\n\t\t// Remove item from current position in the list\n\t\tif (item.prev !== null) {\n\t\t\titem.prev.next = item.next;\n\t\t}\n\n\t\tif (item.next !== null) {\n\t\t\titem.next.prev = item.prev;\n\t\t}\n\n\t\t// Update first pointer if this was the first item\n\t\tif (this.first === item) {\n\t\t\tthis.first = item.next;\n\t\t}\n\n\t\t// Add item to the end\n\t\titem.prev = this.last;\n\t\titem.next = null;\n\n\t\tif (this.last !== null) {\n\t\t\tthis.last.next = item;\n\t\t}\n\n\t\tthis.last = item;\n\n\t\t// Handle edge case: if this was the only item, it's also first\n\t\tif (this.first === null) {\n\t\t\tthis.first = item;\n\t\t}\n\t}\n\n\t/**\n\t * Returns an array of all keys in the cache, ordered from least to most recently used.\n\t *\n\t * @method keys\n\t * @memberof LRU\n\t * @returns {string[]} Array of keys in LRU order.\n\t * @example\n\t * cache.set('a', 1).set('b', 2);\n\t * cache.get('a'); // Move 'a' to most recent\n\t * console.log(cache.keys()); // ['b', 'a']\n\t * @see {@link LRU#values}\n\t * @see {@link LRU#entries}\n\t * @since 9.0.0\n\t */\n\tkeys () {\n\t\tconst result = new Array(this.size);\n\t\tlet x = this.first;\n\t\tlet i = 0;\n\n\t\twhile (x !== null) {\n\t\t\tresult[i++] = x.key;\n\t\t\tx = x.next;\n\t\t}\n\n\t\treturn result;\n\t}\n\n\t/**\n\t * Sets a value in the cache and returns any evicted item.\n\t *\n\t * @method setWithEvicted\n\t * @memberof LRU\n\t * @param {string} key - The key to set.\n\t * @param {*} value - The value to store.\n\t * @param {boolean} [resetTtl=this.resetTtl] - Whether to reset the TTL for this operation.\n\t * @returns {Object|null} The evicted item (if any) with shape {key, value, expiry, prev, next}, or null.\n\t * @example\n\t * const cache = new LRU(2);\n\t * cache.set('a', 1).set('b', 2);\n\t * const evicted = cache.setWithEvicted('c', 3); // evicted = {key: 'a', value: 1, ...}\n\t * @see {@link LRU#set}\n\t * @see {@link LRU#evict}\n\t * @since 11.3.0\n\t */\n\tsetWithEvicted (key, value, resetTtl = this.resetTtl) {\n\t\tlet evicted = null;\n\n\t\tif (this.has(key)) {\n\t\t\tthis.set(key, value, true, resetTtl);\n\t\t} else {\n\t\t\tif (this.max > 0 && this.size === this.max) {\n\t\t\t\tevicted = {...this.first};\n\t\t\t\tthis.evict(true);\n\t\t\t}\n\n\t\t\tlet item = this.items[key] = {\n\t\t\t\texpiry: this.ttl > 0 ? Date.now() + this.ttl : this.ttl,\n\t\t\t\tkey: key,\n\t\t\t\tprev: this.last,\n\t\t\t\tnext: null,\n\t\t\t\tvalue\n\t\t\t};\n\n\t\t\tif (++this.size === 1) {\n\t\t\t\tthis.first = item;\n\t\t\t} else {\n\t\t\t\tthis.last.next = item;\n\t\t\t}\n\n\t\t\tthis.last = item;\n\t\t}\n\n\t\treturn evicted;\n\t}\n\n\t/**\n\t * Sets a value in the cache. Updates the item's position to most recently used.\n\t *\n\t * @method set\n\t * @memberof LRU\n\t * @param {string} key - The key to set.\n\t * @param {*} value - The value to store.\n\t * @param {boolean} [bypass=false] - Internal parameter for setWithEvicted method.\n\t * @param {boolean} [resetTtl=this.resetTtl] - Whether to reset the TTL for this operation.\n\t * @returns {LRU} The LRU instance for method chaining.\n\t * @example\n\t * cache.set('key1', 'value1')\n\t * .set('key2', 'value2')\n\t * .set('key3', 'value3');\n\t * @see {@link LRU#get}\n\t * @see {@link LRU#setWithEvicted}\n\t * @since 1.0.0\n\t */\n\tset (key, value, bypass = false, resetTtl = this.resetTtl) {\n\t\tlet item = this.items[key];\n\n\t\tif (bypass || item !== undefined) {\n\t\t\t// Existing item: update value and position\n\t\t\titem.value = value;\n\n\t\t\tif (bypass === false && resetTtl) {\n\t\t\t\titem.expiry = this.ttl > 0 ? Date.now() + this.ttl : this.ttl;\n\t\t\t}\n\n\t\t\t// Always move to end, but the bypass parameter affects TTL reset behavior\n\t\t\tthis.moveToEnd(item);\n\t\t} else {\n\t\t\t// New item: check for eviction and create\n\t\t\tif (this.max > 0 && this.size === this.max) {\n\t\t\t\tthis.evict(true);\n\t\t\t}\n\n\t\t\titem = this.items[key] = {\n\t\t\t\texpiry: this.ttl > 0 ? Date.now() + this.ttl : this.ttl,\n\t\t\t\tkey: key,\n\t\t\t\tprev: this.last,\n\t\t\t\tnext: null,\n\t\t\t\tvalue\n\t\t\t};\n\n\t\t\tif (++this.size === 1) {\n\t\t\t\tthis.first = item;\n\t\t\t} else {\n\t\t\t\tthis.last.next = item;\n\t\t\t}\n\n\t\t\tthis.last = item;\n\t\t}\n\n\t\treturn this;\n\t}\n\n\t/**\n\t * Returns an array of all values in the cache for the specified keys.\n\t * Order follows LRU order (least to most recently used).\n\t *\n\t * @method values\n\t * @memberof LRU\n\t * @param {string[]} [keys=this.keys()] - Array of keys to get values for. Defaults to all keys.\n\t * @returns {Array<*>} Array of values corresponding to the keys in LRU order.\n\t * @example\n\t * cache.set('a', 1).set('b', 2);\n\t * console.log(cache.values()); // [1, 2]\n\t * console.log(cache.values(['a'])); // [1]\n\t * @see {@link LRU#keys}\n\t * @see {@link LRU#entries}\n\t * @since 11.1.0\n\t */\n\tvalues (keys = this.keys()) {\n\t\tconst result = new Array(keys.length);\n\t\tfor (let i = 0; i < keys.length; i++) {\n\t\t\tresult[i] = this.get(keys[i]);\n\t\t}\n\n\t\treturn result;\n\t}\n}\n\n/**\n * Factory function to create a new LRU cache instance with parameter validation.\n *\n * @function lru\n * @param {number} [max=1000] - Maximum number of items to store. Must be >= 0. Use 0 for unlimited size.\n * @param {number} [ttl=0] - Time to live in milliseconds. Must be >= 0. Use 0 for no expiration.\n * @param {boolean} [resetTtl=false] - Whether to reset TTL when accessing existing items via get().\n * @returns {LRU} A new LRU cache instance.\n * @throws {TypeError} When parameters are invalid (negative numbers or wrong types).\n * @example\n * // Create cache with factory function\n * const cache = lru(100, 5000, true);\n * cache.set('key', 'value');\n *\n * @example\n * // Error handling\n * try {\n * const cache = lru(-1); // Invalid max\n * } catch (error) {\n * console.error(error.message); // \"Invalid max value\"\n * }\n * @see {@link LRU}\n * @since 1.0.0\n */\nexport function lru (max = 1000, ttl = 0, resetTtl = false) {\n\tif (isNaN(max) || max < 0) {\n\t\tthrow new TypeError(\"Invalid max value\");\n\t}\n\n\tif (isNaN(ttl) || ttl < 0) {\n\t\tthrow new TypeError(\"Invalid ttl value\");\n\t}\n\n\tif (typeof resetTtl !== \"boolean\") {\n\t\tthrow new TypeError(\"Invalid resetTtl value\");\n\t}\n\n\treturn new LRU(max, ttl, 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\ No newline at end of file +{"version":3,"file":"tiny-lru.umd.min.js","sources":["../src/lru.js"],"sourcesContent":["/**\n * A high-performance Least Recently Used (LRU) cache implementation with optional TTL support.\n * Items are automatically evicted when the cache reaches its maximum size,\n * removing the least recently used items first. All core operations (get, set, delete) are O(1).\n *\n * @class LRU\n * @example\n * // Create a cache with max 100 items\n * const cache = new LRU(100);\n * cache.set('key1', 'value1');\n * console.log(cache.get('key1')); // 'value1'\n *\n * @example\n * // Create a cache with TTL\n * const cache = new LRU(100, 5000); // 5 second TTL\n * cache.set('key1', 'value1');\n * // After 5 seconds, key1 will be expired\n */\nexport class LRU {\n\t/**\n\t * Creates a new LRU cache instance.\n\t * Note: Constructor does not validate parameters. Use lru() factory function for parameter validation.\n\t *\n\t * @constructor\n\t * @param {number} [max=0] - Maximum number of items to store. 0 means unlimited.\n\t * @param {number} [ttl=0] - Time to live in milliseconds. 0 means no expiration.\n\t * @param {boolean} [resetTtl=false] - Whether to reset TTL when accessing existing items via get().\n\t * @example\n\t * const cache = new LRU(1000, 60000, true); // 1000 items, 1 minute TTL, reset on access\n\t * @see {@link lru} For parameter validation\n\t * @since 1.0.0\n\t */\n\tconstructor (max = 0, ttl = 0, resetTtl = false) {\n\t\tthis.first = null;\n\t\tthis.items = Object.create(null);\n\t\tthis.last = null;\n\t\tthis.max = max;\n\t\tthis.resetTtl = resetTtl;\n\t\tthis.size = 0;\n\t\tthis.ttl = ttl;\n\t}\n\n\t/**\n\t * Removes all items from the cache.\n\t *\n\t * @method clear\n\t * @memberof LRU\n\t * @returns {LRU} The LRU instance for method chaining.\n\t * @example\n\t * cache.clear();\n\t * console.log(cache.size); // 0\n\t * @since 1.0.0\n\t */\n\tclear () {\n\t\tthis.first = null;\n\t\tthis.items = Object.create(null);\n\t\tthis.last = null;\n\t\tthis.size = 0;\n\n\t\treturn this;\n\t}\n\n\t/**\n\t * Removes an item from the cache by key.\n\t *\n\t * @method delete\n\t * @memberof LRU\n\t * @param {string} key - The key of the item to delete.\n\t * @returns {LRU} The LRU instance for method chaining.\n\t * @example\n\t * cache.set('key1', 'value1');\n\t * cache.delete('key1');\n\t * console.log(cache.has('key1')); // false\n\t * @see {@link LRU#has}\n\t * @see {@link LRU#clear}\n\t * @since 1.0.0\n\t */\n\tdelete (key) {\n\t\tconst item = this.items[key];\n\n\t\tif (item !== undefined) {\n\t\t\tdelete this.items[key];\n\t\t\tthis.size--;\n\n\t\t\tif (item.prev !== null) {\n\t\t\t\titem.prev.next = item.next;\n\t\t\t}\n\n\t\t\tif (item.next !== null) {\n\t\t\t\titem.next.prev = item.prev;\n\t\t\t}\n\n\t\t\tif (this.first === item) {\n\t\t\t\tthis.first = item.next;\n\t\t\t}\n\n\t\t\tif (this.last === item) {\n\t\t\t\tthis.last = item.prev;\n\t\t\t}\n\n\t\t\titem.prev = null;\n\t\t\titem.next = null;\n\t\t}\n\n\t\treturn this;\n\t}\n\n\t/**\n\t * Returns an array of [key, value] pairs for the specified keys.\n\t * Order follows LRU order (least to most recently used).\n\t *\n\t * @method entries\n\t * @memberof LRU\n\t * @param {string[]} [keys=this.keys()] - Array of keys to get entries for. Defaults to all keys.\n\t * @returns {Array>} Array of [key, value] pairs in LRU order.\n\t * @example\n\t * cache.set('a', 1).set('b', 2);\n\t * console.log(cache.entries()); // [['a', 1], ['b', 2]]\n\t * console.log(cache.entries(['a'])); // [['a', 1]]\n\t * @see {@link LRU#keys}\n\t * @see {@link LRU#values}\n\t * @since 11.1.0\n\t */\n\tentries (keys) {\n\t\tif (keys === undefined) {\n\t\t\tkeys = this.keys();\n\t\t}\n\n\t\tconst result = Array.from({ length: keys.length });\n\t\tfor (let i = 0; i < keys.length; i++) {\n\t\t\tconst key = keys[i];\n\t\t\tconst item = this.items[key];\n\t\t\tresult[i] = [key, item !== undefined ? item.value : undefined];\n\t\t}\n\n\t\treturn result;\n\t}\n\n\t/**\n\t * Removes the least recently used item from the cache.\n\t *\n\t * @method evict\n\t * @memberof LRU\n\t * @param {boolean} [bypass=false] - Whether to force eviction even when cache is empty.\n\t * @returns {LRU} The LRU instance for method chaining.\n\t * @example\n\t * cache.set('old', 'value').set('new', 'value');\n\t * cache.evict(); // Removes 'old' item\n\t * @see {@link LRU#setWithEvicted}\n\t * @since 1.0.0\n\t */\n\tevict (bypass = false) {\n\t\tif (bypass || this.size > 0) {\n\t\t\tconst item = this.first;\n\n\t\t\tif (!item) {\n\t\t\t\treturn this;\n\t\t\t}\n\n\t\t\tdelete this.items[item.key];\n\n\t\t\tif (--this.size === 0) {\n\t\t\t\tthis.first = null;\n\t\t\t\tthis.last = null;\n\t\t\t} else {\n\t\t\t\tthis.first = item.next;\n\t\t\t\tthis.first.prev = null;\n\t\t\t}\n\n\t\t\titem.next = null;\n\t\t}\n\n\t\treturn this;\n\t}\n\n\t/**\n\t * Returns the expiration timestamp for a given key.\n\t *\n\t * @method expiresAt\n\t * @memberof LRU\n\t * @param {string} key - The key to check expiration for.\n\t * @returns {number|undefined} The expiration timestamp in milliseconds, or undefined if key doesn't exist.\n\t * @example\n\t * const cache = new LRU(100, 5000); // 5 second TTL\n\t * cache.set('key1', 'value1');\n\t * console.log(cache.expiresAt('key1')); // timestamp 5 seconds from now\n\t * @see {@link LRU#get}\n\t * @see {@link LRU#has}\n\t * @since 1.0.0\n\t */\n\texpiresAt (key) {\n\t\tconst item = this.items[key];\n\t\treturn item !== undefined ? item.expiry : undefined;\n\t}\n\n\t/**\n\t * Retrieves a value from the cache by key. Updates the item's position to most recently used.\n\t *\n\t * @method get\n\t * @memberof LRU\n\t * @param {string} key - The key to retrieve.\n\t * @returns {*} The value associated with the key, or undefined if not found or expired.\n\t * @example\n\t * cache.set('key1', 'value1');\n\t * console.log(cache.get('key1')); // 'value1'\n\t * console.log(cache.get('nonexistent')); // undefined\n\t * @see {@link LRU#set}\n\t * @see {@link LRU#has}\n\t * @since 1.0.0\n\t */\n\tget (key) {\n\t\tconst item = this.items[key];\n\n\t\tif (item !== undefined) {\n\t\t\t// Check TTL only if enabled to avoid unnecessary Date.now() calls\n\t\t\tif (this.ttl > 0) {\n\t\t\t\tif (item.expiry <= Date.now()) {\n\t\t\t\t\tthis.delete(key);\n\n\t\t\t\t\treturn undefined;\n\t\t\t\t}\n\t\t\t}\n\n\t\t\t// Fast LRU update without full set() overhead\n\t\t\tthis.moveToEnd(item);\n\n\t\t\treturn item.value;\n\t\t}\n\n\t\treturn undefined;\n\t}\n\n\t/**\n\t * Checks if a key exists in the cache.\n\t *\n\t * @method has\n\t * @memberof LRU\n\t * @param {string} key - The key to check for.\n\t * @returns {boolean} True if the key exists, false otherwise.\n\t * @example\n\t * cache.set('key1', 'value1');\n\t * console.log(cache.has('key1')); // true\n\t * console.log(cache.has('nonexistent')); // false\n\t * @see {@link LRU#get}\n\t * @see {@link LRU#delete}\n\t * @since 9.0.0\n\t */\n\thas (key) {\n\t\tconst item = this.items[key];\n\t\treturn item !== undefined && (this.ttl === 0 || item.expiry > Date.now());\n\t}\n\n\t/**\n\t * Efficiently moves an item to the end of the LRU list (most recently used position).\n\t * This is an internal optimization method that avoids the overhead of the full set() operation\n\t * when only LRU position needs to be updated.\n\t *\n\t * @method moveToEnd\n\t * @memberof LRU\n\t * @param {Object} item - The cache item with prev/next pointers to reposition.\n\t * @private\n\t * @since 11.3.5\n\t */\n\tmoveToEnd (item) {\n\t\tif (this.last === item) {\n\t\t\treturn;\n\t\t}\n\n\t\tif (item.prev !== null) {\n\t\t\titem.prev.next = item.next;\n\t\t}\n\n\t\tif (item.next !== null) {\n\t\t\titem.next.prev = item.prev;\n\t\t}\n\n\t\tif (this.first === item) {\n\t\t\tthis.first = item.next;\n\t\t}\n\n\t\titem.prev = this.last;\n\t\titem.next = null;\n\n\t\tif (this.last !== null) {\n\t\t\tthis.last.next = item;\n\t\t}\n\n\t\tthis.last = item;\n\t}\n\n\t/**\n\t * Returns an array of all keys in the cache, ordered from least to most recently used.\n\t *\n\t * @method keys\n\t * @memberof LRU\n\t * @returns {string[]} Array of keys in LRU order.\n\t * @example\n\t * cache.set('a', 1).set('b', 2);\n\t * cache.get('a'); // Move 'a' to most recent\n\t * console.log(cache.keys()); // ['b', 'a']\n\t * @see {@link LRU#values}\n\t * @see {@link LRU#entries}\n\t * @since 9.0.0\n\t */\n\tkeys () {\n\t\tconst result = Array.from({ length: this.size });\n\t\tlet x = this.first;\n\t\tlet i = 0;\n\n\t\twhile (x !== null) {\n\t\t\tresult[i++] = x.key;\n\t\t\tx = x.next;\n\t\t}\n\n\t\treturn result;\n\t}\n\n\t/**\n\t * Sets a value in the cache and returns any evicted item.\n\t *\n\t * @method setWithEvicted\n\t * @memberof LRU\n\t * @param {string} key - The key to set.\n\t * @param {*} value - The value to store.\n\t * @param {boolean} [resetTtl=this.resetTtl] - Whether to reset the TTL for this operation.\n\t * @returns {Object|null} The evicted item (if any) with shape {key, value, expiry, prev, next}, or null.\n\t * @example\n\t * const cache = new LRU(2);\n\t * cache.set('a', 1).set('b', 2);\n\t * const evicted = cache.setWithEvicted('c', 3); // evicted = {key: 'a', value: 1, ...}\n\t * @see {@link LRU#set}\n\t * @see {@link LRU#evict}\n\t * @since 11.3.0\n\t */\n\tsetWithEvicted (key, value, resetTtl = this.resetTtl) {\n\t\tlet evicted = null;\n\t\tlet item = this.items[key];\n\n\t\tif (item !== undefined) {\n\t\t\titem.value = value;\n\t\t\tif (resetTtl) {\n\t\t\t\titem.expiry = this.ttl > 0 ? 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Defaults to all keys.\n\t * @returns {Array<*>} Array of values corresponding to the keys in LRU order.\n\t * @example\n\t * cache.set('a', 1).set('b', 2);\n\t * console.log(cache.values()); // [1, 2]\n\t * console.log(cache.values(['a'])); // [1]\n\t * @see {@link LRU#keys}\n\t * @see {@link LRU#entries}\n\t * @since 11.1.0\n\t */\n\tvalues (keys) {\n\t\tif (keys === undefined) {\n\t\t\tkeys = this.keys();\n\t\t}\n\n\t\tconst result = Array.from({ length: keys.length });\n\t\tfor (let i = 0; i < keys.length; i++) {\n\t\t\tconst item = this.items[keys[i]];\n\t\t\tresult[i] = item !== undefined ? item.value : undefined;\n\t\t}\n\n\t\treturn result;\n\t}\n}\n\n/**\n * Factory function to create a new LRU cache instance with parameter validation.\n *\n * @function lru\n * @param {number} [max=1000] - Maximum number of items to store. Must be >= 0. Use 0 for unlimited size.\n * @param {number} [ttl=0] - Time to live in milliseconds. Must be >= 0. Use 0 for no expiration.\n * @param {boolean} [resetTtl=false] - Whether to reset TTL when accessing existing items via get().\n * @returns {LRU} A new LRU cache instance.\n * @throws {TypeError} When parameters are invalid (negative numbers or wrong types).\n * @example\n * // Create cache with factory function\n * const cache = lru(100, 5000, true);\n * cache.set('key', 'value');\n *\n * @example\n * // Error handling\n * try {\n * const cache = lru(-1); // Invalid max\n * } catch (error) {\n * console.error(error.message); // \"Invalid max value\"\n * }\n * @see {@link LRU}\n * @since 1.0.0\n */\nexport function lru (max = 1000, ttl = 0, resetTtl = false) {\n\tif (isNaN(max) || max < 0) {\n\t\tthrow new TypeError(\"Invalid max value\");\n\t}\n\n\tif (isNaN(ttl) || ttl < 0) {\n\t\tthrow new TypeError(\"Invalid ttl value\");\n\t}\n\n\tif (typeof resetTtl !== \"boolean\") {\n\t\tthrow new TypeError(\"Invalid resetTtl value\");\n\t}\n\n\treturn new LRU(max, ttl, 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\ No newline at end of file diff --git a/src/lru.js b/src/lru.js index 31908b1..b68f1e3 100644 --- a/src/lru.js +++ b/src/lru.js @@ -97,6 +97,9 @@ export class LRU { if (this.last === item) { this.last = item.prev; } + + item.prev = null; + item.next = null; } return this; @@ -126,7 +129,8 @@ export class LRU { const result = Array.from({ length: keys.length }); for (let i = 0; i < keys.length; i++) { const key = keys[i]; - result[i] = [key, this.get(key)]; + const item = this.items[key]; + result[i] = [key, item !== undefined ? item.value : undefined]; } return result; @@ -162,6 +166,8 @@ export class LRU { this.first = item.next; this.first.prev = null; } + + item.next = null; } return this; @@ -183,13 +189,8 @@ export class LRU { * @since 1.0.0 */ expiresAt (key) { - let result; - - if (this.has(key)) { - result = this.items[key].expiry; - } - - return result; + const item = this.items[key]; + return item !== undefined ? item.expiry : undefined; } /** @@ -261,12 +262,10 @@ export class LRU { * @since 11.3.5 */ moveToEnd (item) { - // If already at the end, nothing to do if (this.last === item) { return; } - // Remove item from current position in the list if (item.prev !== null) { item.prev.next = item.next; } @@ -275,12 +274,10 @@ export class LRU { item.next.prev = item.prev; } - // Update first pointer if this was the first item if (this.first === item) { this.first = item.next; } - // Add item to the end item.prev = this.last; item.next = null; @@ -289,11 +286,6 @@ export class LRU { } this.last = item; - - // Handle edge case: if this was the only item, it's also first - if (this.first === null) { - this.first = item; - } } /** @@ -342,9 +334,14 @@ export class LRU { */ setWithEvicted (key, value, resetTtl = this.resetTtl) { let evicted = null; + let item = this.items[key]; - if (this.has(key)) { - this.set(key, value, true, resetTtl); + if (item !== undefined) { + item.value = value; + if (resetTtl) { + item.expiry = this.ttl > 0 ? Date.now() + this.ttl : this.ttl; + } + this.moveToEnd(item); } else { if (this.max > 0 && this.size === this.max) { evicted = { @@ -355,7 +352,7 @@ export class LRU { this.evict(true); } - let item = this.items[key] = { + item = this.items[key] = { expiry: this.ttl > 0 ? Date.now() + this.ttl : this.ttl, key: key, prev: this.last, @@ -455,7 +452,8 @@ export class LRU { const result = Array.from({ length: keys.length }); for (let i = 0; i < keys.length; i++) { - result[i] = this.get(keys[i]); + const item = this.items[keys[i]]; + result[i] = item !== undefined ? item.value : undefined; } return result; diff --git a/tests/unit/lru.js b/tests/unit/lru.js index e7eb87a..2f4ffd4 100644 --- a/tests/unit/lru.js +++ b/tests/unit/lru.js @@ -532,38 +532,5 @@ describe("LRU Cache", function () { cache.set("x", 2, false, true); assert.equal(cache.expiresAt("x"), 0); }); - - it("should handle moveToEnd edge case by direct method invocation", function () { - const cache = new LRU(1); - - cache.set("only", "value"); - - const item = cache.first; - assert.equal(cache.first, cache.last); - assert.equal(item, cache.last); - - const dummyItem = { - key: "dummy", - value: "dummy", - prev: item, - next: null, - expiry: 0 - }; - - item.next = dummyItem; - cache.last = dummyItem; - - const originalNext = item.next; - item.next = null; - - cache.first = null; - cache.last = dummyItem; - - cache.moveToEnd(item); - - assert.equal(cache.first, item); - - item.next = originalNext; - }); }); }); From 5eac383e9a1da5dabc4c26354b06ab6239cf3cc2 Mon Sep 17 00:00:00 2001 From: Jason Mulligan Date: Fri, 20 Mar 2026 20:37:39 -0400 Subject: [PATCH 17/28] Update AGENTS.md with common issues and implementation notes --- AGENTS.md | 18 +++++++++++++++++- 1 file changed, 17 insertions(+), 1 deletion(-) diff --git a/AGENTS.md b/AGENTS.md index 122362a..5a6cd4b 100644 --- a/AGENTS.md +++ b/AGENTS.md @@ -55,7 +55,23 @@ Source code is in `src/`. ## Testing -- Framework: Mocha +- Framework: Node.js built-in test runner (`node --test`) - Coverage: 100% (c8) - Test pattern: `tests/**/*.js` - All tests must pass with 100% coverage before merging +- Run: `npm test` (lint + tests) + +## Common Issues to Avoid + +- **Memory leaks**: When removing items from the linked list, always clear `prev`/`next` pointers to allow garbage collection +- **LRU order pollution**: Methods like `entries()` and `values()` should access items directly rather than calling `get()`, which moves items and can delete expired items mid-iteration +- **TTL edge cases**: Direct property access (`this.items[key]`) should be used instead of `has()` when you need to inspect expired-but-not-yet-deleted items +- **Dead code**: Always verify edge case code is actually reachable before adding special handling +- **Constructor assignment**: Use `let` not `const` for variables that may be reassigned (e.g., in `setWithEvicted`) + +## Implementation Notes + +- The LRU uses a doubly-linked list with `first` and `last` pointers for O(1) operations +- TTL is stored per-item as an `expiry` timestamp; `0` means no expiration +- `moveToEnd()` is the core method for maintaining LRU order - item is always moved to the `last` position +- `setWithEvicted()` optimizes updates by avoiding the full `set()` path for existing keys From 26a6e14d12f7ddcb0576c5a006e421f95c0dbd2a Mon Sep 17 00:00:00 2001 From: Jason Mulligan Date: Fri, 20 Mar 2026 20:41:14 -0400 Subject: [PATCH 18/28] Remove dead code in moveToEnd() --- src/lru.js | 6 +----- 1 file changed, 1 insertion(+), 5 deletions(-) diff --git a/src/lru.js b/src/lru.js index b68f1e3..3f136ac 100644 --- a/src/lru.js +++ b/src/lru.js @@ -280,11 +280,7 @@ export class LRU { item.prev = this.last; item.next = null; - - if (this.last !== null) { - this.last.next = item; - } - + this.last.next = item; this.last = item; } From 9d4f7c12ccc0287a7b4f08ebf4fd7e653c825624 Mon Sep 17 00:00:00 2001 From: Jason Mulligan Date: Fri, 20 Mar 2026 20:54:30 -0400 Subject: [PATCH 19/28] Update lint script to check formatting --- package.json | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/package.json b/package.json index 4ffe554..1d0ea4a 100644 --- a/package.json +++ b/package.json @@ -39,7 +39,7 @@ "benchmark:all": "npm run benchmark:modern && npm run benchmark:perf && npm run benchmark:comparison", "changelog": "auto-changelog -p", "fmt": "oxfmt --write *.js src/*.js tests/**/*.js benchmarks/*.js", - "lint": "oxlint --fix *.js src/*.js tests/**/*.js benchmarks/*.js", + "lint": "oxlint *.js benchmarks src tests/unit && oxfmt *.js benchmarks/*.js src/*.js tests/unit/*.js --check", "rollup": "rollup --config", "test": "npm run lint && node --test tests/**/*.js", "prepare": "husky" From f5fa3fe10e5e7da419fffa191752ef273906fa54 Mon Sep 17 00:00:00 2001 From: Jason Mulligan Date: Fri, 20 Mar 2026 20:54:51 -0400 Subject: [PATCH 20/28] Replace fmt script with fix script --- package.json | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/package.json b/package.json index 1d0ea4a..a9df343 100644 --- a/package.json +++ b/package.json @@ -38,7 +38,7 @@ "benchmark:install-deps": "npm install --no-save lru-cache quick-lru mnemonist", "benchmark:all": "npm run benchmark:modern && npm run benchmark:perf && npm run benchmark:comparison", "changelog": "auto-changelog -p", - "fmt": "oxfmt --write *.js src/*.js tests/**/*.js benchmarks/*.js", + "fix": "oxlint --fix *.js benchmarks src tests/unit && oxfmt *.js benchmarks src tests/unit --write", "lint": "oxlint *.js benchmarks src tests/unit && oxfmt *.js benchmarks/*.js src/*.js tests/unit/*.js --check", "rollup": "rollup --config", "test": "npm run lint && node --test tests/**/*.js", From e96fca95cbad91e726bfeaf4011f82c3bc61ddf8 Mon Sep 17 00:00:00 2001 From: Jason Mulligan Date: Fri, 20 Mar 2026 20:55:43 -0400 Subject: [PATCH 21/28] Apply formatting fixes --- benchmarks/README.md | 52 +- benchmarks/comparison-benchmark.js | 928 +++++++-------- benchmarks/modern-benchmark.js | 666 +++++------ benchmarks/performance-observer-benchmark.js | 570 +++++----- dist/tiny-lru.cjs | 6 +- dist/tiny-lru.js | 6 +- dist/tiny-lru.min.js | 2 +- dist/tiny-lru.min.js.map | 2 +- dist/tiny-lru.umd.js | 6 +- dist/tiny-lru.umd.min.js | 2 +- dist/tiny-lru.umd.min.js.map | 2 +- eslint.config.js | 346 +++--- rollup.config.js | 69 +- src/lru.js | 896 +++++++-------- tests/unit/lru.js | 1064 +++++++++--------- 15 files changed, 2359 insertions(+), 2258 deletions(-) diff --git a/benchmarks/README.md b/benchmarks/README.md index c6d16b6..dc9247e 100644 --- a/benchmarks/README.md +++ b/benchmarks/README.md @@ -16,6 +16,7 @@ This directory contains modern benchmark implementations for the tiny-lru librar - Realistic workload scenarios without measuring setup/teardown **Test Categories**: + - SET operations (empty cache, full cache, eviction scenarios) - GET operations (hit/miss patterns, access patterns) - Mixed operations (real-world 80/20 read-write scenarios) @@ -26,7 +27,7 @@ This directory contains modern benchmark implementations for the tiny-lru librar **Comprehensive comparison against other popular LRU cache libraries** -- **Libraries Tested**: +- **Libraries Tested**: - `tiny-lru` (this library) - `lru-cache` (most popular npm LRU implementation) - `quick-lru` (fast, lightweight alternative) @@ -39,6 +40,7 @@ This directory contains modern benchmark implementations for the tiny-lru librar - Multiple operations per measured callback to reduce harness overhead **Test Categories**: + - SET operations across all libraries - GET operations with pre-populated caches - DELETE operations comparison @@ -59,6 +61,7 @@ This directory contains modern benchmark implementations for the tiny-lru librar - Deterministic mixed workloads (no `Math.random()` in measured loops) **Test Categories**: + - Performance Observer based function timing - Custom timer with statistical analysis - Scalability tests (100 to 10,000 cache sizes) @@ -111,6 +114,7 @@ node benchmarks/comparison-benchmark.js ## Understanding the Results ### Tinybench Output + ``` ┌─────────┬─────────────────────────────┬─────────────────┬────────────────────┬──────────┬─────────┐ │ (index) │ Task Name │ ops/sec │ Average Time (ns) │ Margin │ Samples │ @@ -124,6 +128,7 @@ node benchmarks/comparison-benchmark.js - **Samples**: Number of samples collected for statistical significance ### Performance Observer Output + ``` ┌─────────────┬─────────┬────────────┬────────────┬────────────┬───────────────┬─────────┬────────┐ │ Function │ Calls │ Avg (ms) │ Min (ms) │ Max (ms) │ Median (ms) │ Std Dev │Ops/sec │ @@ -132,6 +137,7 @@ node benchmarks/comparison-benchmark.js ``` ### Comparison Benchmark Output + ``` 📊 SET Operations Benchmark ┌─────────┬─────────────────────────────┬─────────────────┬────────────────────┬──────────┬─────────┐ @@ -155,71 +161,88 @@ Memory Usage Results: ## Benchmark Categories Explained ### SET Operations + Tests cache write performance under various conditions: + - **Empty cache**: Setting items in a fresh cache - **Full cache**: Setting items when cache is at capacity (triggers eviction) - **Random vs Sequential**: Different access patterns - + Implementation details: + - Deterministic keys/values are pre-generated once per run - Access indices are precomputed via a fast PRNG (xorshift) to avoid runtime randomness - Multiple operations are executed per benchmark callback to minimize harness overhead -### GET Operations +### GET Operations + Tests cache read performance: + - **Cache hits**: Reading existing items - **Cache misses**: Reading non-existent items - **Mixed patterns**: Realistic 80% hit / 20% miss scenarios - + Implementation details: + - Caches are pre-populated outside the measured section - Access indices are precomputed; no `Math.random()` inside measured loops ### Mixed Operations + Real-world usage simulation: + - **80/20 read-write**: Typical web application pattern - **Cache warming**: Sequential population scenarios - **High churn**: Frequent eviction scenarios - **LRU access patterns**: Testing LRU algorithm efficiency - + Implementation details: + - Choice and index streams are precomputed - No wall-clock calls (`Date.now`) inside hot paths ### Special Operations + Edge cases and additional functionality: + - **Delete operations**: Individual item removal - **Clear operations**: Complete cache clearing - **Different data types**: Numbers, objects, strings - **Memory usage**: Heap consumption analysis - + Implementation details: + - Delete benchmarks maintain a steady state by re-adding deleted keys to keep cardinality stable ## Best Practices Implemented ### 1. Statistical Significance + - Minimum execution time (1 second) for reliable results - Multiple iterations for statistical validity - Standard deviation and margin of error reporting ### 2. Realistic Test Data + - Variable key/value sizes mimicking real applications - Deterministic pseudo-random and sequential access patterns (precomputed) - Pre-population scenarios for realistic cache states ### 3. Multiple Measurement Approaches + - **Tinybench**: Modern, accurate micro-benchmarking - **Performance Observer**: Native Node.js function timing - **Custom timers**: High-resolution manual timing ### 4. Comprehensive Coverage + - Different cache sizes (100, 1K, 5K, 10K) - Various workload patterns - Memory consumption analysis - Edge case testing ### 5. Methodology Improvements (Current) + - Setup/teardown moved outside measured sections to avoid skewing results - Deterministic data and access patterns (no randomness in hot paths) - Batched operations per invocation reduce harness overhead reliably across tasks @@ -228,6 +251,7 @@ Implementation details: ## Performance Tips ### For accurate results: + 1. **Close other applications** to reduce system noise 2. **Run multiple times** and compare results 3. **Use consistent hardware** for comparisons @@ -235,13 +259,15 @@ Implementation details: 5. **Consider CPU frequency scaling** on laptops ### Environment information included: + - Node.js version -- Platform and architecture +- Platform and architecture - Timestamp for result tracking ## Interpreting Results ### Good Performance Indicators: + - ✅ **Consistent ops/sec** across runs - ✅ **Low margin of error** (< 5%) - ✅ **Reasonable standard deviation** @@ -249,6 +275,7 @@ Implementation details: - ✅ **Cache hits faster than misses** ### Warning Signs: + - ⚠️ **High margin of error** (> 10%) - ⚠️ **Widely varying results** between runs - ⚠️ **Memory usage growing unexpectedly** @@ -260,16 +287,17 @@ To add new benchmark scenarios: ```javascript // In modern-benchmark.js -bench.add('your-test-name', () => { +bench.add("your-test-name", () => { // Your test code here const cache = lru(1000); - cache.set('key', 'value'); + cache.set("key", "value"); }); ``` ## Contributing When adding new benchmarks: + 1. Follow the existing naming conventions 2. Include proper setup/teardown 3. Add statistical significance checks @@ -279,6 +307,7 @@ When adding new benchmarks: ## Benchmark Results Archive Consider saving benchmark results with: + ```bash # Save all benchmark results npm run benchmark:all > results/benchmark-$(date +%Y%m%d-%H%M%S).txt @@ -296,19 +325,22 @@ This helps track performance improvements/regressions over time. Choose the right benchmark for your needs: ### Use `modern-benchmark.js` when: + - ✅ You want comprehensive analysis of tiny-lru performance - ✅ You need statistical significance and margin of error data - ✅ You're testing different cache sizes and workload patterns - ✅ You want realistic scenario testing ### Use `comparison-benchmark.js` when: + - ✅ You're evaluating tiny-lru against other LRU libraries - ✅ You need bundle size and memory usage comparisons - ✅ You want to see competitive performance analysis - ✅ You're making library selection decisions ### Use `performance-observer-benchmark.js` when: + - ✅ You need native Node.js performance measurement - ✅ You want function-level timing analysis - ✅ You're testing scalability across different cache sizes -- ✅ You prefer Performance API over external libraries \ No newline at end of file +- ✅ You prefer Performance API over external libraries diff --git a/benchmarks/comparison-benchmark.js b/benchmarks/comparison-benchmark.js index 1eae753..2cde8be 100644 --- a/benchmarks/comparison-benchmark.js +++ b/benchmarks/comparison-benchmark.js @@ -12,29 +12,29 @@ import { lru as tinyLru } from "../src/lru.js"; let LRUCache, QuickLRU, MnemonistLRU; try { - const lruCacheModule = await import("lru-cache"); - LRUCache = lruCacheModule.LRUCache || lruCacheModule.default; + const lruCacheModule = await import("lru-cache"); + LRUCache = lruCacheModule.LRUCache || lruCacheModule.default; } catch { - console.error("lru-cache not found. Run: npm install --no-save lru-cache"); - process.exit(1); + console.error("lru-cache not found. Run: npm install --no-save lru-cache"); + process.exit(1); } try { - const quickLruModule = await import("quick-lru"); - QuickLRU = quickLruModule.default; + const quickLruModule = await import("quick-lru"); + QuickLRU = quickLruModule.default; } catch { - console.error("quick-lru not found. Run: npm install --no-save quick-lru"); - process.exit(1); + console.error("quick-lru not found. Run: npm install --no-save quick-lru"); + process.exit(1); } try { - // Import from mnemonist using the correct export pattern - const mnemonistModule = await import("mnemonist"); - MnemonistLRU = mnemonistModule.LRUCacheWithDelete; + // Import from mnemonist using the correct export pattern + const mnemonistModule = await import("mnemonist"); + MnemonistLRU = mnemonistModule.LRUCacheWithDelete; } catch (error) { - console.error("mnemonist not found. Run: npm install --no-save mnemonist"); - console.error("Error:", error.message); - process.exit(1); + console.error("mnemonist not found. Run: npm install --no-save mnemonist"); + console.error("Error:", error.message); + process.exit(1); } // Configuration @@ -49,20 +49,20 @@ const OPS_PER_INVOCATION = 50; // Do multiple ops per call to reduce harness ove * @param {number} count - Number of items to generate * @returns {{keys: string[], values: Array<{id:number,data:string,nested:{foo:string,baz:number}}>} } */ -function generateTestData (count) { - const keys = Array.from({ length: count }); - const values = Array.from({ length: count }); - - for (let i = 0; i < count; i++) { - keys[i] = `key_${i}`; - values[i] = { - id: i, - data: `value_${i}`, - nested: { foo: "bar", baz: i } - }; - } - - return { keys, values }; +function generateTestData(count) { + const keys = Array.from({ length: count }); + const values = Array.from({ length: count }); + + for (let i = 0; i < count; i++) { + keys[i] = `key_${i}`; + values[i] = { + id: i, + data: `value_${i}`, + nested: { foo: "bar", baz: i }, + }; + } + + return { keys, values }; } /** @@ -72,31 +72,33 @@ function generateTestData (count) { * @param {number} modulo - Upper bound for indices * @returns {Uint32Array} */ -function generateAccessPattern (length, modulo) { - const pattern = new Uint32Array(length); - let x = 123456789; - let y = 362436069; - // Xorshift-based fast PRNG to avoid using Math.random() - for (let i = 0; i < length; i++) { - x ^= x << 13; x ^= x >>> 17; x ^= x << 5; - y = y + 1 >>> 0; - const n = x + y >>> 0; - pattern[i] = n % modulo; - } - - return pattern; +function generateAccessPattern(length, modulo) { + const pattern = new Uint32Array(length); + let x = 123456789; + let y = 362436069; + // Xorshift-based fast PRNG to avoid using Math.random() + for (let i = 0; i < length; i++) { + x ^= x << 13; + x ^= x >>> 17; + x ^= x << 5; + y = (y + 1) >>> 0; + const n = (x + y) >>> 0; + pattern[i] = n % modulo; + } + + return pattern; } // Initialize caches -function createCaches () { - return { - "tiny-lru": tinyLru(CACHE_SIZE), - "tiny-lru-ttl": tinyLru(CACHE_SIZE, TTL_MS), - "lru-cache": new LRUCache({ max: CACHE_SIZE }), - "lru-cache-ttl": new LRUCache({ max: CACHE_SIZE, ttl: TTL_MS }), - "quick-lru": new QuickLRU({ maxSize: CACHE_SIZE }), - "mnemonist": new MnemonistLRU(CACHE_SIZE) - }; +function createCaches() { + return { + "tiny-lru": tinyLru(CACHE_SIZE), + "tiny-lru-ttl": tinyLru(CACHE_SIZE, TTL_MS), + "lru-cache": new LRUCache({ max: CACHE_SIZE }), + "lru-cache-ttl": new LRUCache({ max: CACHE_SIZE, ttl: TTL_MS }), + "quick-lru": new QuickLRU({ maxSize: CACHE_SIZE }), + mnemonist: new MnemonistLRU(CACHE_SIZE), + }; } // Memory usage helper @@ -106,420 +108,446 @@ function createCaches () { * @param {boolean} force - Whether to call global.gc() if available * @returns {NodeJS.MemoryUsage} */ -function getMemoryUsage (force = false) { - if (force && global.gc) { - global.gc(); - } +function getMemoryUsage(force = false) { + if (force && global.gc) { + global.gc(); + } - return process.memoryUsage(); + return process.memoryUsage(); } // Calculate memory per item -function calculateMemoryPerItem (beforeMem, afterMem, itemCount) { - const heapDiff = afterMem.heapUsed - beforeMem.heapUsed; +function calculateMemoryPerItem(beforeMem, afterMem, itemCount) { + const heapDiff = afterMem.heapUsed - beforeMem.heapUsed; - return Math.round(heapDiff / itemCount); + return Math.round(heapDiff / itemCount); } // Bundle size estimation (approximate) const bundleSizes = { - "tiny-lru": "2.1KB", - "lru-cache": "~15KB", - "quick-lru": "~1.8KB", - "mnemonist": "~45KB" + "tiny-lru": "2.1KB", + "lru-cache": "~15KB", + "quick-lru": "~1.8KB", + mnemonist: "~45KB", }; -async function runBenchmarks () { - console.log("🚀 LRU Cache Library Comparison Benchmark\n"); - console.log(`Cache Size: ${CACHE_SIZE} items`); - console.log(`Iterations: ${ITERATIONS.toLocaleString()}`); - console.log(`Node.js: ${process.version}`); - console.log(`Platform: ${process.platform} ${process.arch}\n`); - - const testData = generateTestData(ITERATIONS); - const setPattern = generateAccessPattern(ITERATIONS, testData.keys.length); - const getPattern = generateAccessPattern(ITERATIONS, Math.min(CACHE_SIZE, 500)); - const updatePattern = generateAccessPattern(ITERATIONS, 100); - const deletePattern = generateAccessPattern(ITERATIONS, 50); - - // SET operations benchmark - console.log("📊 SET Operations Benchmark"); - console.log("=" .repeat(50)); - - const setBench = new Bench({ time: 2000 }); - - // Dedicated caches and state for SET to avoid measuring setup per-iteration - const setCaches = createCaches(); - const setState = { - "tiny-lru": 0, - "tiny-lru-ttl": 0, - "lru-cache": 0, - "lru-cache-ttl": 0, - "quick-lru": 0, - "mnemonist": 0 - }; - - setBench - .add("tiny-lru set", () => { - const cache = setCaches["tiny-lru"]; - let i = setState["tiny-lru"]; // cursor - for (let j = 0; j < OPS_PER_INVOCATION; j++) { - const idx = setPattern[i++ % setPattern.length]; - cache.set(testData.keys[idx], testData.values[idx]); - } - setState["tiny-lru"] = i; - }) - .add("tiny-lru-ttl set", () => { - const cache = setCaches["tiny-lru-ttl"]; - let i = setState["tiny-lru-ttl"]; - for (let j = 0; j < OPS_PER_INVOCATION; j++) { - const idx = setPattern[i++ % setPattern.length]; - cache.set(testData.keys[idx], testData.values[idx]); - } - setState["tiny-lru-ttl"] = i; - }) - .add("lru-cache set", () => { - const cache = setCaches["lru-cache"]; - let i = setState["lru-cache"]; - for (let j = 0; j < OPS_PER_INVOCATION; j++) { - const idx = setPattern[i++ % setPattern.length]; - cache.set(testData.keys[idx], testData.values[idx]); - } - setState["lru-cache"] = i; - }) - .add("lru-cache-ttl set", () => { - const cache = setCaches["lru-cache-ttl"]; - let i = setState["lru-cache-ttl"]; - for (let j = 0; j < OPS_PER_INVOCATION; j++) { - const idx = setPattern[i++ % setPattern.length]; - cache.set(testData.keys[idx], testData.values[idx]); - } - setState["lru-cache-ttl"] = i; - }) - .add("quick-lru set", () => { - const cache = setCaches["quick-lru"]; - let i = setState["quick-lru"]; - for (let j = 0; j < OPS_PER_INVOCATION; j++) { - const idx = setPattern[i++ % setPattern.length]; - cache.set(testData.keys[idx], testData.values[idx]); - } - setState["quick-lru"] = i; - }) - .add("mnemonist set", () => { - const cache = setCaches.mnemonist; - let i = setState.mnemonist; - for (let j = 0; j < OPS_PER_INVOCATION; j++) { - const idx = setPattern[i++ % setPattern.length]; - cache.set(testData.keys[idx], testData.values[idx]); - } - setState.mnemonist = i; - }); - - await setBench.run(); - console.table(setBench.table()); - - // GET operations benchmark (with pre-populated caches) - console.log("\n📊 GET Operations Benchmark"); - console.log("=" .repeat(50)); - - const caches = createCaches(); - - // Pre-populate all caches deterministically - const prepopulated = Math.min(CACHE_SIZE, 500); - Object.values(caches).forEach(cache => { - for (let i = 0; i < prepopulated; i++) { - cache.set(testData.keys[i], testData.values[i]); - } - }); - - const getBench = new Bench({ time: 2000 }); - const getState = { idx: 0 }; - - getBench - .add("tiny-lru get", () => { - let i = getState.idx; - for (let j = 0; j < OPS_PER_INVOCATION; j++) { - const idx = getPattern[i++ % getPattern.length]; - caches["tiny-lru"].get(testData.keys[idx]); - } - getState.idx = i; - }) - .add("tiny-lru-ttl get", () => { - let i = getState.idx; - for (let j = 0; j < OPS_PER_INVOCATION; j++) { - const idx = getPattern[i++ % getPattern.length]; - caches["tiny-lru-ttl"].get(testData.keys[idx]); - } - getState.idx = i; - }) - .add("lru-cache get", () => { - let i = getState.idx; - for (let j = 0; j < OPS_PER_INVOCATION; j++) { - const idx = getPattern[i++ % getPattern.length]; - caches["lru-cache"].get(testData.keys[idx]); - } - getState.idx = i; - }) - .add("lru-cache-ttl get", () => { - let i = getState.idx; - for (let j = 0; j < OPS_PER_INVOCATION; j++) { - const idx = getPattern[i++ % getPattern.length]; - caches["lru-cache-ttl"].get(testData.keys[idx]); - } - getState.idx = i; - }) - .add("quick-lru get", () => { - let i = getState.idx; - for (let j = 0; j < OPS_PER_INVOCATION; j++) { - const idx = getPattern[i++ % getPattern.length]; - caches["quick-lru"].get(testData.keys[idx]); - } - getState.idx = i; - }) - .add("mnemonist get", () => { - let i = getState.idx; - for (let j = 0; j < OPS_PER_INVOCATION; j++) { - const idx = getPattern[i++ % getPattern.length]; - caches.mnemonist.get(testData.keys[idx]); - } - getState.idx = i; - }); - - await getBench.run(); - console.table(getBench.table()); - - // DELETE operations benchmark - console.log("\n📊 DELETE Operations Benchmark"); - console.log("=" .repeat(50)); - - const deleteBench = new Bench({ time: 2000 }); - - // Dedicated caches and state for DELETE - const deleteCaches = { - "tiny-lru": tinyLru(CACHE_SIZE), - "lru-cache": new LRUCache({ max: CACHE_SIZE }), - "quick-lru": new QuickLRU({ maxSize: CACHE_SIZE }), - "mnemonist": new MnemonistLRU(CACHE_SIZE) - }; - const deleteState = { idx: 0 }; - - // Pre-populate - Object.values(deleteCaches).forEach(cache => { - for (let i = 0; i < 100; i++) { - cache.set(testData.keys[i], testData.values[i]); - } - }); - - deleteBench - .add("tiny-lru delete", () => { - let i = deleteState.idx; - for (let j = 0; j < OPS_PER_INVOCATION; j++) { - const idx = deletePattern[i++ % deletePattern.length]; - deleteCaches["tiny-lru"].delete(testData.keys[idx]); - // Re-add to keep steady state for future deletes - deleteCaches["tiny-lru"].set(testData.keys[idx], testData.values[idx]); - } - deleteState.idx = i; - }) - .add("lru-cache delete", () => { - let i = deleteState.idx; - for (let j = 0; j < OPS_PER_INVOCATION; j++) { - const idx = deletePattern[i++ % deletePattern.length]; - deleteCaches["lru-cache"].delete(testData.keys[idx]); - deleteCaches["lru-cache"].set(testData.keys[idx], testData.values[idx]); - } - deleteState.idx = i; - }) - .add("quick-lru delete", () => { - let i = deleteState.idx; - for (let j = 0; j < OPS_PER_INVOCATION; j++) { - const idx = deletePattern[i++ % deletePattern.length]; - deleteCaches["quick-lru"].delete(testData.keys[idx]); - deleteCaches["quick-lru"].set(testData.keys[idx], testData.values[idx]); - } - deleteState.idx = i; - }) - .add("mnemonist delete", () => { - let i = deleteState.idx; - for (let j = 0; j < OPS_PER_INVOCATION; j++) { - const idx = deletePattern[i++ % deletePattern.length]; - deleteCaches.mnemonist.remove(testData.keys[idx]); - deleteCaches.mnemonist.set(testData.keys[idx], testData.values[idx]); - } - deleteState.idx = i; - }); - - await deleteBench.run(); - console.table(deleteBench.table()); - - // UPDATE operations benchmark - console.log("\n📊 UPDATE Operations Benchmark"); - console.log("=" .repeat(50)); - - const updateBench = new Bench({ time: 2000 }); - - // Dedicated caches for UPDATE - const updateCaches = createCaches(); - // Pre-populate with initial values - Object.values(updateCaches).forEach(cache => { - for (let i = 0; i < 100; i++) { - cache.set(testData.keys[i], testData.values[i]); - } - }); - - const updateState = { idx: 0 }; - - updateBench - .add("tiny-lru update", () => { - let i = updateState.idx; - for (let j = 0; j < OPS_PER_INVOCATION; j++) { - const idx = updatePattern[i++ % updatePattern.length]; - updateCaches["tiny-lru"].set(testData.keys[idx], testData.values[(idx + 50) % testData.values.length]); - } - updateState.idx = i; - }) - .add("tiny-lru-ttl update", () => { - let i = updateState.idx; - for (let j = 0; j < OPS_PER_INVOCATION; j++) { - const idx = updatePattern[i++ % updatePattern.length]; - updateCaches["tiny-lru-ttl"].set(testData.keys[idx], testData.values[(idx + 50) % testData.values.length]); - } - updateState.idx = i; - }) - .add("lru-cache update", () => { - let i = updateState.idx; - for (let j = 0; j < OPS_PER_INVOCATION; j++) { - const idx = updatePattern[i++ % updatePattern.length]; - updateCaches["lru-cache"].set(testData.keys[idx], testData.values[(idx + 50) % testData.values.length]); - } - updateState.idx = i; - }) - .add("lru-cache-ttl update", () => { - let i = updateState.idx; - for (let j = 0; j < OPS_PER_INVOCATION; j++) { - const idx = updatePattern[i++ % updatePattern.length]; - updateCaches["lru-cache-ttl"].set(testData.keys[idx], testData.values[(idx + 50) % testData.values.length]); - } - updateState.idx = i; - }) - .add("quick-lru update", () => { - let i = updateState.idx; - for (let j = 0; j < OPS_PER_INVOCATION; j++) { - const idx = updatePattern[i++ % updatePattern.length]; - updateCaches["quick-lru"].set(testData.keys[idx], testData.values[(idx + 50) % testData.values.length]); - } - updateState.idx = i; - }) - .add("mnemonist update", () => { - let i = updateState.idx; - for (let j = 0; j < OPS_PER_INVOCATION; j++) { - const idx = updatePattern[i++ % updatePattern.length]; - updateCaches.mnemonist.set(testData.keys[idx], testData.values[(idx + 50) % testData.values.length]); - } - updateState.idx = i; - }); - - await updateBench.run(); - console.table(updateBench.table()); - - // Memory usage analysis - console.log("\n📊 Memory Usage Analysis"); - console.log("=" .repeat(50)); - - const memoryResults = {}; - const testSize = 1000; - - for (const [name, cache] of Object.entries(createCaches())) { - const beforeMem = getMemoryUsage(true); - - // Fill cache - for (let i = 0; i < testSize; i++) { - cache.set(testData.keys[i], testData.values[i]); - } - - const afterMem = getMemoryUsage(true); - const memoryPerItem = calculateMemoryPerItem(beforeMem, afterMem, testSize); - - memoryResults[name] = { - totalMemory: afterMem.heapUsed - beforeMem.heapUsed, - memoryPerItem: memoryPerItem, - bundleSize: bundleSizes[name.split("-")[0]] || "N/A" - }; - } - - console.log("\nMemory Usage Results:"); - console.log("┌─────────────────┬─────────────────┬─────────────────┬─────────────────┐"); - console.log("│ Library │ Bundle Size │ Memory/Item │ Total Memory │"); - console.log("├─────────────────┼─────────────────┼─────────────────┼─────────────────┤"); - - Object.entries(memoryResults).forEach(([name, data]) => { - const nameCol = name.padEnd(15); - const bundleCol = data.bundleSize.padEnd(15); - const memoryCol = `${data.memoryPerItem} bytes`.padEnd(15); - const totalCol = `${Math.round(data.totalMemory / 1024)} KB`.padEnd(15); - console.log(`│ ${nameCol} │ ${bundleCol} │ ${memoryCol} │ ${totalCol} │`); - }); - - console.log("└─────────────────┴─────────────────┴─────────────────┴─────────────────┘"); - - // Performance summary - console.log("\n📊 Performance Summary"); - console.log("=" .repeat(50)); - - const setResults = setBench.tasks.map(task => ({ - name: task.name, - opsPerSec: task.result?.hz ? Math.round(task.result.hz) : 0 - })); - - const getResults = getBench.tasks.map(task => ({ - name: task.name, - opsPerSec: task.result?.hz ? Math.round(task.result.hz) : 0 - })); - - const updateResults = updateBench.tasks.map(task => ({ - name: task.name, - opsPerSec: task.result?.hz ? Math.round(task.result.hz) : 0 - })); - - const deleteResults = deleteBench.tasks.map(task => ({ - name: task.name, - opsPerSec: task.result?.hz ? Math.round(task.result.hz) : 0 - })); - - console.log("\nOperations per second (higher is better):"); - console.log("┌─────────────────┬─────────────────┬─────────────────┬─────────────────┬─────────────────┐"); - console.log("│ Library │ SET ops/sec │ GET ops/sec │ UPDATE ops/sec │ DELETE ops/sec │"); - console.log("├─────────────────┼─────────────────┼─────────────────┼─────────────────┼─────────────────┤"); - - // Group results by library - const libraries = ["tiny-lru", "lru-cache", "quick-lru", "mnemonist"]; - - libraries.forEach(lib => { - const setResult = setResults.find(r => r.name.includes(lib)); - const getResult = getResults.find(r => r.name.includes(lib)); - const updateResult = updateResults.find(r => r.name.includes(lib)); - const deleteResult = deleteResults.find(r => r.name.includes(lib)); - - if (setResult && getResult && updateResult && deleteResult) { - const nameCol = lib.padEnd(15); - const setCol = setResult.opsPerSec.toLocaleString().padEnd(15); - const getCol = getResult.opsPerSec.toLocaleString().padEnd(15); - const updateCol = updateResult.opsPerSec.toLocaleString().padEnd(15); - const deleteCol = deleteResult.opsPerSec.toLocaleString().padEnd(15); - console.log(`│ ${nameCol} │ ${setCol} │ ${getCol} │ ${updateCol} │ ${deleteCol} │`); - } - }); - - console.log("└─────────────────┴─────────────────┴─────────────────┴─────────────────┴─────────────────┘"); - - console.log("\n✅ Benchmark completed!"); - console.log("\nTo regenerate this data, run: npm run benchmark:comparison"); +async function runBenchmarks() { + console.log("🚀 LRU Cache Library Comparison Benchmark\n"); + console.log(`Cache Size: ${CACHE_SIZE} items`); + console.log(`Iterations: ${ITERATIONS.toLocaleString()}`); + console.log(`Node.js: ${process.version}`); + console.log(`Platform: ${process.platform} ${process.arch}\n`); + + const testData = generateTestData(ITERATIONS); + const setPattern = generateAccessPattern(ITERATIONS, testData.keys.length); + const getPattern = generateAccessPattern(ITERATIONS, Math.min(CACHE_SIZE, 500)); + const updatePattern = generateAccessPattern(ITERATIONS, 100); + const deletePattern = generateAccessPattern(ITERATIONS, 50); + + // SET operations benchmark + console.log("📊 SET Operations Benchmark"); + console.log("=".repeat(50)); + + const setBench = new Bench({ time: 2000 }); + + // Dedicated caches and state for SET to avoid measuring setup per-iteration + const setCaches = createCaches(); + const setState = { + "tiny-lru": 0, + "tiny-lru-ttl": 0, + "lru-cache": 0, + "lru-cache-ttl": 0, + "quick-lru": 0, + mnemonist: 0, + }; + + setBench + .add("tiny-lru set", () => { + const cache = setCaches["tiny-lru"]; + let i = setState["tiny-lru"]; // cursor + for (let j = 0; j < OPS_PER_INVOCATION; j++) { + const idx = setPattern[i++ % setPattern.length]; + cache.set(testData.keys[idx], testData.values[idx]); + } + setState["tiny-lru"] = i; + }) + .add("tiny-lru-ttl set", () => { + const cache = setCaches["tiny-lru-ttl"]; + let i = setState["tiny-lru-ttl"]; + for (let j = 0; j < OPS_PER_INVOCATION; j++) { + const idx = setPattern[i++ % setPattern.length]; + cache.set(testData.keys[idx], testData.values[idx]); + } + setState["tiny-lru-ttl"] = i; + }) + .add("lru-cache set", () => { + const cache = setCaches["lru-cache"]; + let i = setState["lru-cache"]; + for (let j = 0; j < OPS_PER_INVOCATION; j++) { + const idx = setPattern[i++ % setPattern.length]; + cache.set(testData.keys[idx], testData.values[idx]); + } + setState["lru-cache"] = i; + }) + .add("lru-cache-ttl set", () => { + const cache = setCaches["lru-cache-ttl"]; + let i = setState["lru-cache-ttl"]; + for (let j = 0; j < OPS_PER_INVOCATION; j++) { + const idx = setPattern[i++ % setPattern.length]; + cache.set(testData.keys[idx], testData.values[idx]); + } + setState["lru-cache-ttl"] = i; + }) + .add("quick-lru set", () => { + const cache = setCaches["quick-lru"]; + let i = setState["quick-lru"]; + for (let j = 0; j < OPS_PER_INVOCATION; j++) { + const idx = setPattern[i++ % setPattern.length]; + cache.set(testData.keys[idx], testData.values[idx]); + } + setState["quick-lru"] = i; + }) + .add("mnemonist set", () => { + const cache = setCaches.mnemonist; + let i = setState.mnemonist; + for (let j = 0; j < OPS_PER_INVOCATION; j++) { + const idx = setPattern[i++ % setPattern.length]; + cache.set(testData.keys[idx], testData.values[idx]); + } + setState.mnemonist = i; + }); + + await setBench.run(); + console.table(setBench.table()); + + // GET operations benchmark (with pre-populated caches) + console.log("\n📊 GET Operations Benchmark"); + console.log("=".repeat(50)); + + const caches = createCaches(); + + // Pre-populate all caches deterministically + const prepopulated = Math.min(CACHE_SIZE, 500); + Object.values(caches).forEach((cache) => { + for (let i = 0; i < prepopulated; i++) { + cache.set(testData.keys[i], testData.values[i]); + } + }); + + const getBench = new Bench({ time: 2000 }); + const getState = { idx: 0 }; + + getBench + .add("tiny-lru get", () => { + let i = getState.idx; + for (let j = 0; j < OPS_PER_INVOCATION; j++) { + const idx = getPattern[i++ % getPattern.length]; + caches["tiny-lru"].get(testData.keys[idx]); + } + getState.idx = i; + }) + .add("tiny-lru-ttl get", () => { + let i = getState.idx; + for (let j = 0; j < OPS_PER_INVOCATION; j++) { + const idx = getPattern[i++ % getPattern.length]; + caches["tiny-lru-ttl"].get(testData.keys[idx]); + } + getState.idx = i; + }) + .add("lru-cache get", () => { + let i = getState.idx; + for (let j = 0; j < OPS_PER_INVOCATION; j++) { + const idx = getPattern[i++ % getPattern.length]; + caches["lru-cache"].get(testData.keys[idx]); + } + getState.idx = i; + }) + .add("lru-cache-ttl get", () => { + let i = getState.idx; + for (let j = 0; j < OPS_PER_INVOCATION; j++) { + const idx = getPattern[i++ % getPattern.length]; + caches["lru-cache-ttl"].get(testData.keys[idx]); + } + getState.idx = i; + }) + .add("quick-lru get", () => { + let i = getState.idx; + for (let j = 0; j < OPS_PER_INVOCATION; j++) { + const idx = getPattern[i++ % getPattern.length]; + caches["quick-lru"].get(testData.keys[idx]); + } + getState.idx = i; + }) + .add("mnemonist get", () => { + let i = getState.idx; + for (let j = 0; j < OPS_PER_INVOCATION; j++) { + const idx = getPattern[i++ % getPattern.length]; + caches.mnemonist.get(testData.keys[idx]); + } + getState.idx = i; + }); + + await getBench.run(); + console.table(getBench.table()); + + // DELETE operations benchmark + console.log("\n📊 DELETE Operations Benchmark"); + console.log("=".repeat(50)); + + const deleteBench = new Bench({ time: 2000 }); + + // Dedicated caches and state for DELETE + const deleteCaches = { + "tiny-lru": tinyLru(CACHE_SIZE), + "lru-cache": new LRUCache({ max: CACHE_SIZE }), + "quick-lru": new QuickLRU({ maxSize: CACHE_SIZE }), + mnemonist: new MnemonistLRU(CACHE_SIZE), + }; + const deleteState = { idx: 0 }; + + // Pre-populate + Object.values(deleteCaches).forEach((cache) => { + for (let i = 0; i < 100; i++) { + cache.set(testData.keys[i], testData.values[i]); + } + }); + + deleteBench + .add("tiny-lru delete", () => { + let i = deleteState.idx; + for (let j = 0; j < OPS_PER_INVOCATION; j++) { + const idx = deletePattern[i++ % deletePattern.length]; + deleteCaches["tiny-lru"].delete(testData.keys[idx]); + // Re-add to keep steady state for future deletes + deleteCaches["tiny-lru"].set(testData.keys[idx], testData.values[idx]); + } + deleteState.idx = i; + }) + .add("lru-cache delete", () => { + let i = deleteState.idx; + for (let j = 0; j < OPS_PER_INVOCATION; j++) { + const idx = deletePattern[i++ % deletePattern.length]; + deleteCaches["lru-cache"].delete(testData.keys[idx]); + deleteCaches["lru-cache"].set(testData.keys[idx], testData.values[idx]); + } + deleteState.idx = i; + }) + .add("quick-lru delete", () => { + let i = deleteState.idx; + for (let j = 0; j < OPS_PER_INVOCATION; j++) { + const idx = deletePattern[i++ % deletePattern.length]; + deleteCaches["quick-lru"].delete(testData.keys[idx]); + deleteCaches["quick-lru"].set(testData.keys[idx], testData.values[idx]); + } + deleteState.idx = i; + }) + .add("mnemonist delete", () => { + let i = deleteState.idx; + for (let j = 0; j < OPS_PER_INVOCATION; j++) { + const idx = deletePattern[i++ % deletePattern.length]; + deleteCaches.mnemonist.remove(testData.keys[idx]); + deleteCaches.mnemonist.set(testData.keys[idx], testData.values[idx]); + } + deleteState.idx = i; + }); + + await deleteBench.run(); + console.table(deleteBench.table()); + + // UPDATE operations benchmark + console.log("\n📊 UPDATE Operations Benchmark"); + console.log("=".repeat(50)); + + const updateBench = new Bench({ time: 2000 }); + + // Dedicated caches for UPDATE + const updateCaches = createCaches(); + // Pre-populate with initial values + Object.values(updateCaches).forEach((cache) => { + for (let i = 0; i < 100; i++) { + cache.set(testData.keys[i], testData.values[i]); + } + }); + + const updateState = { idx: 0 }; + + updateBench + .add("tiny-lru update", () => { + let i = updateState.idx; + for (let j = 0; j < OPS_PER_INVOCATION; j++) { + const idx = updatePattern[i++ % updatePattern.length]; + updateCaches["tiny-lru"].set( + testData.keys[idx], + testData.values[(idx + 50) % testData.values.length], + ); + } + updateState.idx = i; + }) + .add("tiny-lru-ttl update", () => { + let i = updateState.idx; + for (let j = 0; j < OPS_PER_INVOCATION; j++) { + const idx = updatePattern[i++ % updatePattern.length]; + updateCaches["tiny-lru-ttl"].set( + testData.keys[idx], + testData.values[(idx + 50) % testData.values.length], + ); + } + updateState.idx = i; + }) + .add("lru-cache update", () => { + let i = updateState.idx; + for (let j = 0; j < OPS_PER_INVOCATION; j++) { + const idx = updatePattern[i++ % updatePattern.length]; + updateCaches["lru-cache"].set( + testData.keys[idx], + testData.values[(idx + 50) % testData.values.length], + ); + } + updateState.idx = i; + }) + .add("lru-cache-ttl update", () => { + let i = updateState.idx; + for (let j = 0; j < OPS_PER_INVOCATION; j++) { + const idx = updatePattern[i++ % updatePattern.length]; + updateCaches["lru-cache-ttl"].set( + testData.keys[idx], + testData.values[(idx + 50) % testData.values.length], + ); + } + updateState.idx = i; + }) + .add("quick-lru update", () => { + let i = updateState.idx; + for (let j = 0; j < OPS_PER_INVOCATION; j++) { + const idx = updatePattern[i++ % updatePattern.length]; + updateCaches["quick-lru"].set( + testData.keys[idx], + testData.values[(idx + 50) % testData.values.length], + ); + } + updateState.idx = i; + }) + .add("mnemonist update", () => { + let i = updateState.idx; + for (let j = 0; j < OPS_PER_INVOCATION; j++) { + const idx = updatePattern[i++ % updatePattern.length]; + updateCaches.mnemonist.set( + testData.keys[idx], + testData.values[(idx + 50) % testData.values.length], + ); + } + updateState.idx = i; + }); + + await updateBench.run(); + console.table(updateBench.table()); + + // Memory usage analysis + console.log("\n📊 Memory Usage Analysis"); + console.log("=".repeat(50)); + + const memoryResults = {}; + const testSize = 1000; + + for (const [name, cache] of Object.entries(createCaches())) { + const beforeMem = getMemoryUsage(true); + + // Fill cache + for (let i = 0; i < testSize; i++) { + cache.set(testData.keys[i], testData.values[i]); + } + + const afterMem = getMemoryUsage(true); + const memoryPerItem = calculateMemoryPerItem(beforeMem, afterMem, testSize); + + memoryResults[name] = { + totalMemory: afterMem.heapUsed - beforeMem.heapUsed, + memoryPerItem: memoryPerItem, + bundleSize: bundleSizes[name.split("-")[0]] || "N/A", + }; + } + + console.log("\nMemory Usage Results:"); + console.log("┌─────────────────┬─────────────────┬─────────────────┬─────────────────┐"); + console.log("│ Library │ Bundle Size │ Memory/Item │ Total Memory │"); + console.log("├─────────────────┼─────────────────┼─────────────────┼─────────────────┤"); + + Object.entries(memoryResults).forEach(([name, data]) => { + const nameCol = name.padEnd(15); + const bundleCol = data.bundleSize.padEnd(15); + const memoryCol = `${data.memoryPerItem} bytes`.padEnd(15); + const totalCol = `${Math.round(data.totalMemory / 1024)} KB`.padEnd(15); + console.log(`│ ${nameCol} │ ${bundleCol} │ ${memoryCol} │ ${totalCol} │`); + }); + + console.log("└─────────────────┴─────────────────┴─────────────────┴─────────────────┘"); + + // Performance summary + console.log("\n📊 Performance Summary"); + console.log("=".repeat(50)); + + const setResults = setBench.tasks.map((task) => ({ + name: task.name, + opsPerSec: task.result?.hz ? Math.round(task.result.hz) : 0, + })); + + const getResults = getBench.tasks.map((task) => ({ + name: task.name, + opsPerSec: task.result?.hz ? Math.round(task.result.hz) : 0, + })); + + const updateResults = updateBench.tasks.map((task) => ({ + name: task.name, + opsPerSec: task.result?.hz ? Math.round(task.result.hz) : 0, + })); + + const deleteResults = deleteBench.tasks.map((task) => ({ + name: task.name, + opsPerSec: task.result?.hz ? Math.round(task.result.hz) : 0, + })); + + console.log("\nOperations per second (higher is better):"); + console.log( + "┌─────────────────┬─────────────────┬─────────────────┬─────────────────┬─────────────────┐", + ); + console.log( + "│ Library │ SET ops/sec │ GET ops/sec │ UPDATE ops/sec │ DELETE ops/sec │", + ); + console.log( + "├─────────────────┼─────────────────┼─────────────────┼─────────────────┼─────────────────┤", + ); + + // Group results by library + const libraries = ["tiny-lru", "lru-cache", "quick-lru", "mnemonist"]; + + libraries.forEach((lib) => { + const setResult = setResults.find((r) => r.name.includes(lib)); + const getResult = getResults.find((r) => r.name.includes(lib)); + const updateResult = updateResults.find((r) => r.name.includes(lib)); + const deleteResult = deleteResults.find((r) => r.name.includes(lib)); + + if (setResult && getResult && updateResult && deleteResult) { + const nameCol = lib.padEnd(15); + const setCol = setResult.opsPerSec.toLocaleString().padEnd(15); + const getCol = getResult.opsPerSec.toLocaleString().padEnd(15); + const updateCol = updateResult.opsPerSec.toLocaleString().padEnd(15); + const deleteCol = deleteResult.opsPerSec.toLocaleString().padEnd(15); + console.log(`│ ${nameCol} │ ${setCol} │ ${getCol} │ ${updateCol} │ ${deleteCol} │`); + } + }); + + console.log( + "└─────────────────┴─────────────────┴─────────────────┴─────────────────┴─────────────────┘", + ); + + console.log("\n✅ Benchmark completed!"); + console.log("\nTo regenerate this data, run: npm run benchmark:comparison"); } // Handle unhandled promise rejections -process.on("unhandledRejection", error => { - console.error("Unhandled promise rejection:", error); - process.exit(1); +process.on("unhandledRejection", (error) => { + console.error("Unhandled promise rejection:", error); + process.exit(1); }); // Run benchmarks diff --git a/benchmarks/modern-benchmark.js b/benchmarks/modern-benchmark.js index 8170df3..b3282cd 100644 --- a/benchmarks/modern-benchmark.js +++ b/benchmarks/modern-benchmark.js @@ -5,8 +5,8 @@ import { lru } from "../dist/tiny-lru.js"; const CACHE_SIZES = [100, 1000, 5000]; const WORKLOAD_SIZES = [50, 500, 2500]; // Half of cache size for realistic workloads const ITERATIONS = { - time: 1000, // Run for 1 second minimum - iterations: 100 // Minimum iterations for statistical significance + time: 1000, // Run for 1 second minimum + iterations: 100, // Minimum iterations for statistical significance }; // Utility functions for generating test data @@ -16,32 +16,34 @@ const ITERATIONS = { * @param {number} size - Number of items * @returns {Array<{key:string,value:string}>} */ -function generateRandomData (size) { - const data = Array.from({ length: size }); - let x = 2463534242; - for (let i = 0; i < size; i++) { - // xorshift32 - x ^= x << 13; x ^= x >>> 17; x ^= x << 5; - const n = (x >>> 0).toString(36); - data[i] = { - key: `key_${i}_${n}`, - value: `value_${i}_${n}${n}` - }; - } - - return data; +function generateRandomData(size) { + const data = Array.from({ length: size }); + let x = 2463534242; + for (let i = 0; i < size; i++) { + // xorshift32 + x ^= x << 13; + x ^= x >>> 17; + x ^= x << 5; + const n = (x >>> 0).toString(36); + data[i] = { + key: `key_${i}_${n}`, + value: `value_${i}_${n}${n}`, + }; + } + + return data; } -function generateSequentialData (size) { - const data = Array.from({ length: size }); - for (let i = 0; i < size; i++) { - data[i] = { - key: `seq_key_${i}`, - value: `seq_value_${i}` - }; - } +function generateSequentialData(size) { + const data = Array.from({ length: size }); + for (let i = 0; i < size; i++) { + data[i] = { + key: `seq_key_${i}`, + value: `seq_value_${i}`, + }; + } - return data; + return data; } /** @@ -51,343 +53,345 @@ function generateSequentialData (size) { * @param {number} modulo - Upper bound (exclusive) * @returns {Uint32Array} */ -function generateAccessPattern (length, modulo) { - const pattern = new Uint32Array(length); - let x = 123456789; - let y = 362436069; - for (let i = 0; i < length; i++) { - x ^= x << 13; x ^= x >>> 17; x ^= x << 5; - y = y + 1 >>> 0; - pattern[i] = (x + y >>> 0) % modulo; - } - - return pattern; +function generateAccessPattern(length, modulo) { + const pattern = new Uint32Array(length); + let x = 123456789; + let y = 362436069; + for (let i = 0; i < length; i++) { + x ^= x << 13; + x ^= x >>> 17; + x ^= x << 5; + y = (y + 1) >>> 0; + pattern[i] = ((x + y) >>> 0) % modulo; + } + + return pattern; } // Pre-populate cache with data -function prepopulateCache (cache, data, fillRatio = 0.8) { - const fillCount = Math.floor(data.length * fillRatio); - for (let i = 0; i < fillCount; i++) { - cache.set(data[i].key, data[i].value); - } +function prepopulateCache(cache, data, fillRatio = 0.8) { + const fillCount = Math.floor(data.length * fillRatio); + for (let i = 0; i < fillCount; i++) { + cache.set(data[i].key, data[i].value); + } } // Benchmark suites -async function runSetOperationsBenchmarks () { - console.log("\n📝 SET Operations Benchmarks"); - console.log("=" .repeat(50)); - - for (const cacheSize of CACHE_SIZES) { - const workloadSize = WORKLOAD_SIZES[CACHE_SIZES.indexOf(cacheSize)]; - const bench = new Bench(ITERATIONS); - - console.log(`\nCache Size: ${cacheSize}, Workload: ${workloadSize}`); - - // Prepare test data & patterns - const randomData = generateRandomData(workloadSize); - const sequentialData = generateSequentialData(workloadSize); - const randomPattern = generateAccessPattern(10000, workloadSize); - let randomCursor = 0; - - // Test scenarios - bench - .add(`set-random-empty-cache-${cacheSize}`, () => { - const cache = lru(cacheSize); - const idx = randomPattern[randomCursor++ % randomPattern.length]; - const item = randomData[idx]; - cache.set(item.key, item.value); - }) - .add(`set-sequential-empty-cache-${cacheSize}`, () => { - const cache = lru(cacheSize); - const idx = randomPattern[randomCursor++ % randomPattern.length]; - const item = sequentialData[idx]; - cache.set(item.key, item.value); - }) - .add(`set-random-full-cache-${cacheSize}`, () => { - const cache = lru(cacheSize); - prepopulateCache(cache, randomData); - const idx = randomPattern[randomCursor++ % randomPattern.length]; - const item = randomData[idx]; - cache.set(item.key, item.value); - }) - .add(`set-new-items-full-cache-${cacheSize}`, () => { - const cache = lru(cacheSize); - prepopulateCache(cache, randomData); - // Force eviction by adding new items - const idx = randomPattern[randomCursor++ % randomPattern.length]; - cache.set(`new_key_${cacheSize}_${idx}`, `new_value_${idx}`); - }); - - await bench.run(); - console.table(bench.table()); - } +async function runSetOperationsBenchmarks() { + console.log("\n📝 SET Operations Benchmarks"); + console.log("=".repeat(50)); + + for (const cacheSize of CACHE_SIZES) { + const workloadSize = WORKLOAD_SIZES[CACHE_SIZES.indexOf(cacheSize)]; + const bench = new Bench(ITERATIONS); + + console.log(`\nCache Size: ${cacheSize}, Workload: ${workloadSize}`); + + // Prepare test data & patterns + const randomData = generateRandomData(workloadSize); + const sequentialData = generateSequentialData(workloadSize); + const randomPattern = generateAccessPattern(10000, workloadSize); + let randomCursor = 0; + + // Test scenarios + bench + .add(`set-random-empty-cache-${cacheSize}`, () => { + const cache = lru(cacheSize); + const idx = randomPattern[randomCursor++ % randomPattern.length]; + const item = randomData[idx]; + cache.set(item.key, item.value); + }) + .add(`set-sequential-empty-cache-${cacheSize}`, () => { + const cache = lru(cacheSize); + const idx = randomPattern[randomCursor++ % randomPattern.length]; + const item = sequentialData[idx]; + cache.set(item.key, item.value); + }) + .add(`set-random-full-cache-${cacheSize}`, () => { + const cache = lru(cacheSize); + prepopulateCache(cache, randomData); + const idx = randomPattern[randomCursor++ % randomPattern.length]; + const item = randomData[idx]; + cache.set(item.key, item.value); + }) + .add(`set-new-items-full-cache-${cacheSize}`, () => { + const cache = lru(cacheSize); + prepopulateCache(cache, randomData); + // Force eviction by adding new items + const idx = randomPattern[randomCursor++ % randomPattern.length]; + cache.set(`new_key_${cacheSize}_${idx}`, `new_value_${idx}`); + }); + + await bench.run(); + console.table(bench.table()); + } } -async function runGetOperationsBenchmarks () { - console.log("\n🔍 GET Operations Benchmarks"); - console.log("=" .repeat(50)); - - for (const cacheSize of CACHE_SIZES) { - const workloadSize = WORKLOAD_SIZES[CACHE_SIZES.indexOf(cacheSize)]; - const bench = new Bench(ITERATIONS); - - console.log(`\nCache Size: ${cacheSize}, Workload: ${workloadSize}`); - - // Prepare test data and caches - const randomData = generateRandomData(workloadSize); - const sequentialData = generateSequentialData(workloadSize); - - const randomCache = lru(cacheSize); - const sequentialCache = lru(cacheSize); - const mixedCache = lru(cacheSize); - - prepopulateCache(randomCache, randomData); - prepopulateCache(sequentialCache, sequentialData); - prepopulateCache(mixedCache, [...randomData.slice(0, Math.floor(workloadSize / 2)), - ...sequentialData.slice(0, Math.floor(workloadSize / 2))]); - - const hitPattern = generateAccessPattern(20000, Math.floor(workloadSize * 0.8)); - const missPattern = generateAccessPattern(20000, 1 << 30); - let getCursor = 0; - - bench - .add(`get-hit-random-${cacheSize}`, () => { - const idx = hitPattern[getCursor++ % hitPattern.length]; - const item = randomData[idx]; - randomCache.get(item.key); - }) - .add(`get-hit-sequential-${cacheSize}`, () => { - const idx = hitPattern[getCursor++ % hitPattern.length]; - const item = sequentialData[idx]; - sequentialCache.get(item.key); - }) - .add(`get-miss-${cacheSize}`, () => { - const idx = missPattern[getCursor++ % missPattern.length]; - randomCache.get(`nonexistent_key_${idx}`); - }) - .add(`get-mixed-pattern-${cacheSize}`, () => { - const choose = hitPattern[getCursor++ % hitPattern.length] % 10; // 0..9 - if (choose < 8) { - const idx = hitPattern[getCursor++ % hitPattern.length]; - const item = randomData[idx]; - mixedCache.get(item.key); - } else { - const idx = missPattern[getCursor++ % missPattern.length]; - mixedCache.get(`miss_key_${idx}`); - } - }); - - await bench.run(); - console.table(bench.table()); - } +async function runGetOperationsBenchmarks() { + console.log("\n🔍 GET Operations Benchmarks"); + console.log("=".repeat(50)); + + for (const cacheSize of CACHE_SIZES) { + const workloadSize = WORKLOAD_SIZES[CACHE_SIZES.indexOf(cacheSize)]; + const bench = new Bench(ITERATIONS); + + console.log(`\nCache Size: ${cacheSize}, Workload: ${workloadSize}`); + + // Prepare test data and caches + const randomData = generateRandomData(workloadSize); + const sequentialData = generateSequentialData(workloadSize); + + const randomCache = lru(cacheSize); + const sequentialCache = lru(cacheSize); + const mixedCache = lru(cacheSize); + + prepopulateCache(randomCache, randomData); + prepopulateCache(sequentialCache, sequentialData); + prepopulateCache(mixedCache, [ + ...randomData.slice(0, Math.floor(workloadSize / 2)), + ...sequentialData.slice(0, Math.floor(workloadSize / 2)), + ]); + + const hitPattern = generateAccessPattern(20000, Math.floor(workloadSize * 0.8)); + const missPattern = generateAccessPattern(20000, 1 << 30); + let getCursor = 0; + + bench + .add(`get-hit-random-${cacheSize}`, () => { + const idx = hitPattern[getCursor++ % hitPattern.length]; + const item = randomData[idx]; + randomCache.get(item.key); + }) + .add(`get-hit-sequential-${cacheSize}`, () => { + const idx = hitPattern[getCursor++ % hitPattern.length]; + const item = sequentialData[idx]; + sequentialCache.get(item.key); + }) + .add(`get-miss-${cacheSize}`, () => { + const idx = missPattern[getCursor++ % missPattern.length]; + randomCache.get(`nonexistent_key_${idx}`); + }) + .add(`get-mixed-pattern-${cacheSize}`, () => { + const choose = hitPattern[getCursor++ % hitPattern.length] % 10; // 0..9 + if (choose < 8) { + const idx = hitPattern[getCursor++ % hitPattern.length]; + const item = randomData[idx]; + mixedCache.get(item.key); + } else { + const idx = missPattern[getCursor++ % missPattern.length]; + mixedCache.get(`miss_key_${idx}`); + } + }); + + await bench.run(); + console.table(bench.table()); + } } -async function runMixedOperationsBenchmarks () { - console.log("\n🔄 Mixed Operations Benchmarks (Real-world scenarios)"); - console.log("=" .repeat(60)); - - for (const cacheSize of CACHE_SIZES) { - const workloadSize = WORKLOAD_SIZES[CACHE_SIZES.indexOf(cacheSize)]; - const bench = new Bench(ITERATIONS); - - console.log(`\nCache Size: ${cacheSize}, Workload: ${workloadSize}`); - - const testData = generateRandomData(workloadSize * 2); // More data than cache - const choosePattern = generateAccessPattern(50000, 10); - const idxPattern = generateAccessPattern(50000, testData.length); - let mixedCursor = 0; - - bench - .add(`real-world-80-20-read-write-${cacheSize}`, () => { - const cache = lru(cacheSize); - prepopulateCache(cache, testData, 0.5); - // Simulate 80% reads, 20% writes - for (let i = 0; i < 10; i++) { - const choose = choosePattern[mixedCursor++ % choosePattern.length]; - if (choose < 8) { - const item = testData[idxPattern[mixedCursor++ % idxPattern.length] % workloadSize]; - cache.get(item.key); - } else { - const item = testData[idxPattern[mixedCursor++ % idxPattern.length]]; - cache.set(item.key, item.value); - } - } - }) - .add(`cache-warming-${cacheSize}`, () => { - const cache = lru(cacheSize); - - // Simulate cache warming - sequential fills - for (let i = 0; i < Math.min(cacheSize, workloadSize); i++) { - cache.set(testData[i].key, testData[i].value); - } - }) - .add(`high-churn-${cacheSize}`, () => { - const cache = lru(cacheSize); - prepopulateCache(cache, testData, 1.0); // Fill cache completely - - // High churn - constantly adding new items - for (let i = 0; i < 5; i++) { - const idx = idxPattern[mixedCursor++ % idxPattern.length]; - cache.set(`churn_${cacheSize}_${i}_${idx}`, `value_${i}`); - } - }) - .add(`lru-access-pattern-${cacheSize}`, () => { - const cache = lru(cacheSize); - prepopulateCache(cache, testData, 1.0); - - // Access patterns that test LRU behavior - const hotKeys = testData.slice(0, 3); - cache.get(hotKeys[0].key); - cache.get(hotKeys[1].key); - cache.get(hotKeys[2].key); - cache.get(hotKeys[0].key); - cache.get(hotKeys[1].key); - cache.get(hotKeys[2].key); - }); - - await bench.run(); - console.table(bench.table()); - } +async function runMixedOperationsBenchmarks() { + console.log("\n🔄 Mixed Operations Benchmarks (Real-world scenarios)"); + console.log("=".repeat(60)); + + for (const cacheSize of CACHE_SIZES) { + const workloadSize = WORKLOAD_SIZES[CACHE_SIZES.indexOf(cacheSize)]; + const bench = new Bench(ITERATIONS); + + console.log(`\nCache Size: ${cacheSize}, Workload: ${workloadSize}`); + + const testData = generateRandomData(workloadSize * 2); // More data than cache + const choosePattern = generateAccessPattern(50000, 10); + const idxPattern = generateAccessPattern(50000, testData.length); + let mixedCursor = 0; + + bench + .add(`real-world-80-20-read-write-${cacheSize}`, () => { + const cache = lru(cacheSize); + prepopulateCache(cache, testData, 0.5); + // Simulate 80% reads, 20% writes + for (let i = 0; i < 10; i++) { + const choose = choosePattern[mixedCursor++ % choosePattern.length]; + if (choose < 8) { + const item = testData[idxPattern[mixedCursor++ % idxPattern.length] % workloadSize]; + cache.get(item.key); + } else { + const item = testData[idxPattern[mixedCursor++ % idxPattern.length]]; + cache.set(item.key, item.value); + } + } + }) + .add(`cache-warming-${cacheSize}`, () => { + const cache = lru(cacheSize); + + // Simulate cache warming - sequential fills + for (let i = 0; i < Math.min(cacheSize, workloadSize); i++) { + cache.set(testData[i].key, testData[i].value); + } + }) + .add(`high-churn-${cacheSize}`, () => { + const cache = lru(cacheSize); + prepopulateCache(cache, testData, 1.0); // Fill cache completely + + // High churn - constantly adding new items + for (let i = 0; i < 5; i++) { + const idx = idxPattern[mixedCursor++ % idxPattern.length]; + cache.set(`churn_${cacheSize}_${i}_${idx}`, `value_${i}`); + } + }) + .add(`lru-access-pattern-${cacheSize}`, () => { + const cache = lru(cacheSize); + prepopulateCache(cache, testData, 1.0); + + // Access patterns that test LRU behavior + const hotKeys = testData.slice(0, 3); + cache.get(hotKeys[0].key); + cache.get(hotKeys[1].key); + cache.get(hotKeys[2].key); + cache.get(hotKeys[0].key); + cache.get(hotKeys[1].key); + cache.get(hotKeys[2].key); + }); + + await bench.run(); + console.table(bench.table()); + } } -async function runSpecialOperationsBenchmarks () { - console.log("\n⚙️ Special Operations Benchmarks"); - console.log("=" .repeat(50)); - - const cacheSize = 1000; - const workloadSize = 500; - const bench = new Bench(ITERATIONS); - - const testData = generateRandomData(workloadSize); - const hitPattern = generateAccessPattern(20000, Math.floor(workloadSize * 0.8)); - let cursor = 0; - - // Test cache with different data types - const numberData = Array.from({length: workloadSize}, (_, i) => ({key: i, value: i * 2})); - const objectData = Array.from({length: workloadSize}, (_, i) => ({ - key: `obj_${i}`, - value: {id: i, data: `object_data_${i}`, nested: {prop: i}} - })); - - bench - .add("cache-clear", () => { - const cache = lru(cacheSize); - prepopulateCache(cache, testData); - cache.clear(); - }) - .add("cache-delete", () => { - const cache = lru(cacheSize); - prepopulateCache(cache, testData); - const item = testData[hitPattern[cursor++ % hitPattern.length]]; - cache.delete(item.key); - }) - .add("number-keys-values", () => { - const cache = lru(cacheSize); - const item = numberData[Math.floor(Math.random() * numberData.length)]; - cache.set(item.key, item.value); - cache.get(item.key); - }) - .add("object-values", () => { - const cache = lru(cacheSize); - const item = objectData[Math.floor(Math.random() * objectData.length)]; - cache.set(item.key, item.value); - cache.get(item.key); - }) - .add("has-operation", () => { - const cache = lru(cacheSize); - prepopulateCache(cache, testData); - const item = testData[hitPattern[cursor++ % hitPattern.length]]; - cache.has(item.key); - }) - .add("size-property", () => { - const cache = lru(cacheSize); - prepopulateCache(cache, testData); - // Access size property - - return cache.size; - }); - - await bench.run(); - console.table(bench.table()); +async function runSpecialOperationsBenchmarks() { + console.log("\n⚙️ Special Operations Benchmarks"); + console.log("=".repeat(50)); + + const cacheSize = 1000; + const workloadSize = 500; + const bench = new Bench(ITERATIONS); + + const testData = generateRandomData(workloadSize); + const hitPattern = generateAccessPattern(20000, Math.floor(workloadSize * 0.8)); + let cursor = 0; + + // Test cache with different data types + const numberData = Array.from({ length: workloadSize }, (_, i) => ({ key: i, value: i * 2 })); + const objectData = Array.from({ length: workloadSize }, (_, i) => ({ + key: `obj_${i}`, + value: { id: i, data: `object_data_${i}`, nested: { prop: i } }, + })); + + bench + .add("cache-clear", () => { + const cache = lru(cacheSize); + prepopulateCache(cache, testData); + cache.clear(); + }) + .add("cache-delete", () => { + const cache = lru(cacheSize); + prepopulateCache(cache, testData); + const item = testData[hitPattern[cursor++ % hitPattern.length]]; + cache.delete(item.key); + }) + .add("number-keys-values", () => { + const cache = lru(cacheSize); + const item = numberData[Math.floor(Math.random() * numberData.length)]; + cache.set(item.key, item.value); + cache.get(item.key); + }) + .add("object-values", () => { + const cache = lru(cacheSize); + const item = objectData[Math.floor(Math.random() * objectData.length)]; + cache.set(item.key, item.value); + cache.get(item.key); + }) + .add("has-operation", () => { + const cache = lru(cacheSize); + prepopulateCache(cache, testData); + const item = testData[hitPattern[cursor++ % hitPattern.length]]; + cache.has(item.key); + }) + .add("size-property", () => { + const cache = lru(cacheSize); + prepopulateCache(cache, testData); + // Access size property + + return cache.size; + }); + + await bench.run(); + console.table(bench.table()); } // Memory usage benchmarks -async function runMemoryBenchmarks () { - console.log("\n🧠 Memory Usage Analysis"); - console.log("=" .repeat(40)); +async function runMemoryBenchmarks() { + console.log("\n🧠 Memory Usage Analysis"); + console.log("=".repeat(40)); - const testSizes = [100, 1000, 10000]; + const testSizes = [100, 1000, 10000]; - for (const size of testSizes) { - console.log(`\nAnalyzing memory usage for cache size: ${size}`); + for (const size of testSizes) { + console.log(`\nAnalyzing memory usage for cache size: ${size}`); - const cache = lru(size); - const testData = generateRandomData(size); + const cache = lru(size); + const testData = generateRandomData(size); - // Memory before - if (global.gc) { - global.gc(); - } - const memBefore = process.memoryUsage(); + // Memory before + if (global.gc) { + global.gc(); + } + const memBefore = process.memoryUsage(); - // Fill cache - testData.forEach(item => cache.set(item.key, item.value)); + // Fill cache + testData.forEach((item) => cache.set(item.key, item.value)); - // Memory after - if (global.gc) { - global.gc(); - } - const memAfter = process.memoryUsage(); + // Memory after + if (global.gc) { + global.gc(); + } + const memAfter = process.memoryUsage(); - const heapUsed = memAfter.heapUsed - memBefore.heapUsed; - const perItem = heapUsed / size; + const heapUsed = memAfter.heapUsed - memBefore.heapUsed; + const perItem = heapUsed / size; - console.log(`Heap used: ${(heapUsed / 1024 / 1024).toFixed(2)} MB`); - console.log(`Per item: ${perItem.toFixed(2)} bytes`); - console.log(`Cache size: ${cache.size}`); - } + console.log(`Heap used: ${(heapUsed / 1024 / 1024).toFixed(2)} MB`); + console.log(`Per item: ${perItem.toFixed(2)} bytes`); + console.log(`Cache size: ${cache.size}`); + } } // Main execution -async function runAllBenchmarks () { - console.log("🚀 Tiny-LRU Modern Benchmark Suite"); - console.log("=================================="); - console.log(`Node.js version: ${process.version}`); - console.log(`Platform: ${process.platform} ${process.arch}`); - console.log(`Date: ${new Date().toISOString()}`); - - try { - await runSetOperationsBenchmarks(); - await runGetOperationsBenchmarks(); - await runMixedOperationsBenchmarks(); - await runSpecialOperationsBenchmarks(); - await runMemoryBenchmarks(); - - console.log("\n✅ All benchmarks completed successfully!"); - console.log("\n📊 Summary:"); - console.log("- SET operations: Tests cache population under various conditions"); - console.log("- GET operations: Tests cache retrieval with different hit/miss patterns"); - console.log("- Mixed operations: Simulates real-world usage scenarios"); - console.log("- Special operations: Tests additional cache methods and edge cases"); - console.log("- Memory analysis: Shows memory consumption patterns"); - - } catch (error) { - console.error("❌ Benchmark failed:", error); - process.exit(1); - } +async function runAllBenchmarks() { + console.log("🚀 Tiny-LRU Modern Benchmark Suite"); + console.log("=================================="); + console.log(`Node.js version: ${process.version}`); + console.log(`Platform: ${process.platform} ${process.arch}`); + console.log(`Date: ${new Date().toISOString()}`); + + try { + await runSetOperationsBenchmarks(); + await runGetOperationsBenchmarks(); + await runMixedOperationsBenchmarks(); + await runSpecialOperationsBenchmarks(); + await runMemoryBenchmarks(); + + console.log("\n✅ All benchmarks completed successfully!"); + console.log("\n📊 Summary:"); + console.log("- SET operations: Tests cache population under various conditions"); + console.log("- GET operations: Tests cache retrieval with different hit/miss patterns"); + console.log("- Mixed operations: Simulates real-world usage scenarios"); + console.log("- Special operations: Tests additional cache methods and edge cases"); + console.log("- Memory analysis: Shows memory consumption patterns"); + } catch (error) { + console.error("❌ Benchmark failed:", error); + process.exit(1); + } } // Allow running this file directly if (import.meta.url === `file://${process.argv[1]}`) { - runAllBenchmarks(); + runAllBenchmarks(); } export { - runAllBenchmarks, - runSetOperationsBenchmarks, - runGetOperationsBenchmarks, - runMixedOperationsBenchmarks, - runSpecialOperationsBenchmarks, - runMemoryBenchmarks + runAllBenchmarks, + runSetOperationsBenchmarks, + runGetOperationsBenchmarks, + runMixedOperationsBenchmarks, + runSpecialOperationsBenchmarks, + runMemoryBenchmarks, }; - diff --git a/benchmarks/performance-observer-benchmark.js b/benchmarks/performance-observer-benchmark.js index c813334..a0a1402 100644 --- a/benchmarks/performance-observer-benchmark.js +++ b/benchmarks/performance-observer-benchmark.js @@ -3,282 +3,328 @@ import { lru } from "../dist/tiny-lru.js"; // Custom high-resolution timer benchmark (alternative approach) class CustomTimer { - constructor () { - this.results = new Map(); - } - - async timeFunction (name, fn, iterations = 1000) { - const times = []; - - // Warmup - for (let i = 0; i < Math.min(100, iterations / 10); i++) { - await fn(); - } - - // Actual measurement - for (let i = 0; i < iterations; i++) { - const start = performance.now(); - await fn(); - const end = performance.now(); - times.push(end - start); - } - - // Calculate statistics - const totalTime = times.reduce((a, b) => a + b, 0); - const avgTime = totalTime / iterations; - const minTime = Math.min(...times); - const maxTime = Math.max(...times); - - const sorted = [...times].sort((a, b) => a - b); - const median = sorted[Math.floor(sorted.length / 2)]; - - const variance = times.reduce((acc, time) => acc + Math.pow(time - avgTime, 2), 0) / iterations; - const stdDev = Math.sqrt(variance); - - this.results.set(name, { - name, - iterations, - avgTime, - minTime, - maxTime, - median, - stdDev, - opsPerSec: 1000 / avgTime // Convert ms to ops/sec - }); - } - - printResults () { - console.log("\n⏱️ Performance Results"); - console.log("========================"); - - const results = Array.from(this.results.values()); - console.table(results.map(r => ({ - "Operation": r.name, - "Iterations": r.iterations, - "Avg (ms)": r.avgTime.toFixed(6), - "Min (ms)": r.minTime.toFixed(6), - "Max (ms)": r.maxTime.toFixed(6), - "Median (ms)": r.median.toFixed(6), - "Std Dev": r.stdDev.toFixed(6), - "Ops/sec": Math.round(r.opsPerSec) - }))); - } + constructor() { + this.results = new Map(); + } + + async timeFunction(name, fn, iterations = 1000) { + const times = []; + + // Warmup + for (let i = 0; i < Math.min(100, iterations / 10); i++) { + await fn(); + } + + // Actual measurement + for (let i = 0; i < iterations; i++) { + const start = performance.now(); + await fn(); + const end = performance.now(); + times.push(end - start); + } + + // Calculate statistics + const totalTime = times.reduce((a, b) => a + b, 0); + const avgTime = totalTime / iterations; + const minTime = Math.min(...times); + const maxTime = Math.max(...times); + + const sorted = [...times].sort((a, b) => a - b); + const median = sorted[Math.floor(sorted.length / 2)]; + + const variance = times.reduce((acc, time) => acc + Math.pow(time - avgTime, 2), 0) / iterations; + const stdDev = Math.sqrt(variance); + + this.results.set(name, { + name, + iterations, + avgTime, + minTime, + maxTime, + median, + stdDev, + opsPerSec: 1000 / avgTime, // Convert ms to ops/sec + }); + } + + printResults() { + console.log("\n⏱️ Performance Results"); + console.log("========================"); + + const results = Array.from(this.results.values()); + console.table( + results.map((r) => ({ + Operation: r.name, + Iterations: r.iterations, + "Avg (ms)": r.avgTime.toFixed(6), + "Min (ms)": r.minTime.toFixed(6), + "Max (ms)": r.maxTime.toFixed(6), + "Median (ms)": r.median.toFixed(6), + "Std Dev": r.stdDev.toFixed(6), + "Ops/sec": Math.round(r.opsPerSec), + })), + ); + } } // Test data generation -function generateTestData (size) { - const out = Array.from({ length: size }); - for (let i = 0; i < size; i++) { - out[i] = { - key: `key_${i}`, - value: `value_${i}_${"x".repeat(50)}` - }; - } - - return out; +function generateTestData(size) { + const out = Array.from({ length: size }); + for (let i = 0; i < size; i++) { + out[i] = { + key: `key_${i}`, + value: `value_${i}_${"x".repeat(50)}`, + }; + } + + return out; } -async function runPerformanceBenchmarks () { - console.log("🔬 LRU Performance Benchmarks"); - console.log("=============================="); - console.log("(Using CustomTimer for high-resolution function timing)"); - - const timer = new CustomTimer(); - const cacheSize = 1000; - const iterations = 10000; - const testData = generateTestData(cacheSize * 2); - - console.log("Running operations..."); - - // Phase 1: Fill cache with initial data - console.log("Phase 1: Initial cache population"); - const phase1Cache = lru(cacheSize); - let phase1Index = 0; - await timer.timeFunction("lru.set (initial population)", () => { - const i = phase1Index % cacheSize; - phase1Cache.set(testData[i].key, testData[i].value); - phase1Index++; - }, iterations); - - // Phase 2: Mixed read/write operations - console.log("Phase 2: Mixed operations"); - const phase2Cache = lru(cacheSize); - // Pre-populate for realistic workload - for (let i = 0; i < cacheSize; i++) { - phase2Cache.set(testData[i].key, testData[i].value); - } - - // Deterministic mixed workload that exercises the entire cache without conditionals - const getIndices = new Uint32Array(iterations); - const setIndices = new Uint32Array(iterations); - const hasIndices = new Uint32Array(iterations); - const deleteIndices = new Uint32Array(iterations); - - for (let i = 0; i < iterations; i++) { - const idx = i % cacheSize; - getIndices[i] = idx; - setIndices[i] = idx; - hasIndices[i] = idx; - deleteIndices[i] = idx; - } - - let mixedGetIndex = 0; - await timer.timeFunction("lru.get", () => { - const idx = getIndices[mixedGetIndex % iterations]; - phase2Cache.get(testData[idx].key); - mixedGetIndex++; - }, iterations); - - let mixedSetIndex = 0; - await timer.timeFunction("lru.set", () => { - const idx = setIndices[mixedSetIndex % iterations]; - phase2Cache.set(testData[idx].key, testData[idx].value); - mixedSetIndex++; - }, iterations); - - let mixedHasIndex = 0; - await timer.timeFunction("lru.has", () => { - const idx = hasIndices[mixedHasIndex % iterations]; - phase2Cache.has(testData[idx].key); - mixedHasIndex++; - }, iterations); - - // keys() - await timer.timeFunction("lru.keys", () => { - phase2Cache.keys(); - }, iterations); - - // values() - await timer.timeFunction("lru.values", () => { - phase2Cache.values(); - }, iterations); - - // entries() - await timer.timeFunction("lru.entries", () => { - phase2Cache.entries(); - }, iterations); - - let mixedDeleteIndex = 0; - await timer.timeFunction("lru.delete", () => { - const idx = deleteIndices[mixedDeleteIndex % iterations]; - phase2Cache.delete(testData[idx].key); - mixedDeleteIndex++; - }, iterations); - - // Phase 3: Cache eviction stress test - console.log("Phase 3: Cache eviction stress test"); - const phase3Cache = lru(2); - let phase3Index = 1; - phase3Cache.set(`evict_key_${phase3Index}`, `evict__value_${phase3Index++}`); - await timer.timeFunction("lru.set (eviction stress)", () => { - phase3Cache.set(`evict_key_${phase3Index}`, `evict_value_${phase3Index++}`); - }, iterations); - - // Phase 4: Some clear operations - console.log("Phase 4: Clear operations"); - const phase4Cache = lru(1); - await timer.timeFunction("lru.clear", () => { - phase4Cache.set("temp_1", "temp_value_1"); - phase4Cache.clear(); - }, iterations); - - // Phase 5: Additional API method benchmarks - console.log("Phase 5: Additional API method benchmarks"); - - // setWithEvicted() - const setWithEvictedCache = lru(2); - setWithEvictedCache.set("a", "value_a"); - setWithEvictedCache.set("b", "value_b"); - let setWithEvictedIndex = 0; - await timer.timeFunction("lru.setWithEvicted", () => { - const key = `extra_key_${setWithEvictedIndex}`; - const value = `extra_value_${setWithEvictedIndex}`; - setWithEvictedCache.setWithEvicted(key, value); - setWithEvictedIndex++; - }, iterations); - - // expiresAt() - const expiresCache = lru(cacheSize, 6e4); - const expiresKey = "expires_key"; - expiresCache.set(expiresKey, "expires_value"); - await timer.timeFunction("lru.expiresAt", () => { - expiresCache.expiresAt(expiresKey); - }, iterations); - - timer.printResults(); +async function runPerformanceBenchmarks() { + console.log("🔬 LRU Performance Benchmarks"); + console.log("=============================="); + console.log("(Using CustomTimer for high-resolution function timing)"); + + const timer = new CustomTimer(); + const cacheSize = 1000; + const iterations = 10000; + const testData = generateTestData(cacheSize * 2); + + console.log("Running operations..."); + + // Phase 1: Fill cache with initial data + console.log("Phase 1: Initial cache population"); + const phase1Cache = lru(cacheSize); + let phase1Index = 0; + await timer.timeFunction( + "lru.set (initial population)", + () => { + const i = phase1Index % cacheSize; + phase1Cache.set(testData[i].key, testData[i].value); + phase1Index++; + }, + iterations, + ); + + // Phase 2: Mixed read/write operations + console.log("Phase 2: Mixed operations"); + const phase2Cache = lru(cacheSize); + // Pre-populate for realistic workload + for (let i = 0; i < cacheSize; i++) { + phase2Cache.set(testData[i].key, testData[i].value); + } + + // Deterministic mixed workload that exercises the entire cache without conditionals + const getIndices = new Uint32Array(iterations); + const setIndices = new Uint32Array(iterations); + const hasIndices = new Uint32Array(iterations); + const deleteIndices = new Uint32Array(iterations); + + for (let i = 0; i < iterations; i++) { + const idx = i % cacheSize; + getIndices[i] = idx; + setIndices[i] = idx; + hasIndices[i] = idx; + deleteIndices[i] = idx; + } + + let mixedGetIndex = 0; + await timer.timeFunction( + "lru.get", + () => { + const idx = getIndices[mixedGetIndex % iterations]; + phase2Cache.get(testData[idx].key); + mixedGetIndex++; + }, + iterations, + ); + + let mixedSetIndex = 0; + await timer.timeFunction( + "lru.set", + () => { + const idx = setIndices[mixedSetIndex % iterations]; + phase2Cache.set(testData[idx].key, testData[idx].value); + mixedSetIndex++; + }, + iterations, + ); + + let mixedHasIndex = 0; + await timer.timeFunction( + "lru.has", + () => { + const idx = hasIndices[mixedHasIndex % iterations]; + phase2Cache.has(testData[idx].key); + mixedHasIndex++; + }, + iterations, + ); + + // keys() + await timer.timeFunction( + "lru.keys", + () => { + phase2Cache.keys(); + }, + iterations, + ); + + // values() + await timer.timeFunction( + "lru.values", + () => { + phase2Cache.values(); + }, + iterations, + ); + + // entries() + await timer.timeFunction( + "lru.entries", + () => { + phase2Cache.entries(); + }, + iterations, + ); + + let mixedDeleteIndex = 0; + await timer.timeFunction( + "lru.delete", + () => { + const idx = deleteIndices[mixedDeleteIndex % iterations]; + phase2Cache.delete(testData[idx].key); + mixedDeleteIndex++; + }, + iterations, + ); + + // Phase 3: Cache eviction stress test + console.log("Phase 3: Cache eviction stress test"); + const phase3Cache = lru(2); + let phase3Index = 1; + phase3Cache.set(`evict_key_${phase3Index}`, `evict__value_${phase3Index++}`); + await timer.timeFunction( + "lru.set (eviction stress)", + () => { + phase3Cache.set(`evict_key_${phase3Index}`, `evict_value_${phase3Index++}`); + }, + iterations, + ); + + // Phase 4: Some clear operations + console.log("Phase 4: Clear operations"); + const phase4Cache = lru(1); + await timer.timeFunction( + "lru.clear", + () => { + phase4Cache.set("temp_1", "temp_value_1"); + phase4Cache.clear(); + }, + iterations, + ); + + // Phase 5: Additional API method benchmarks + console.log("Phase 5: Additional API method benchmarks"); + + // setWithEvicted() + const setWithEvictedCache = lru(2); + setWithEvictedCache.set("a", "value_a"); + setWithEvictedCache.set("b", "value_b"); + let setWithEvictedIndex = 0; + await timer.timeFunction( + "lru.setWithEvicted", + () => { + const key = `extra_key_${setWithEvictedIndex}`; + const value = `extra_value_${setWithEvictedIndex}`; + setWithEvictedCache.setWithEvicted(key, value); + setWithEvictedIndex++; + }, + iterations, + ); + + // expiresAt() + const expiresCache = lru(cacheSize, 6e4); + const expiresKey = "expires_key"; + expiresCache.set(expiresKey, "expires_value"); + await timer.timeFunction( + "lru.expiresAt", + () => { + expiresCache.expiresAt(expiresKey); + }, + iterations, + ); + + timer.printResults(); } // Comparison with different cache sizes -async function runScalabilityTest () { - console.log("\n📈 Scalability Test"); - console.log("==================="); - - const sizes = [100, 500, 1000, 5000, 10000]; - const results = []; - - for (const size of sizes) { - console.log(`Testing cache size: ${size}`); - const testData = generateTestData(size); - - // Test set performance - const cache = lru(size); - const setStart = performance.now(); - testData.forEach(item => cache.set(item.key, item.value)); - const setEnd = performance.now(); - const setTime = setEnd - setStart; - - // Test get performance - const getStart = performance.now(); - for (let i = 0; i < 1000; i++) { - const item = testData[Math.floor(Math.random() * testData.length)]; - cache.get(item.key); - } - const getEnd = performance.now(); - const getTime = getEnd - getStart; - - results.push({ - "Size": size, - "Set Total (ms)": setTime.toFixed(2), - "Set Per Item (ms)": (setTime / size).toFixed(4), - "Get 1K Items (ms)": getTime.toFixed(2), - "Get Per Item (ms)": (getTime / 1000).toFixed(4) - }); - } - - console.table(results); +async function runScalabilityTest() { + console.log("\n📈 Scalability Test"); + console.log("==================="); + + const sizes = [100, 500, 1000, 5000, 10000]; + const results = []; + + for (const size of sizes) { + console.log(`Testing cache size: ${size}`); + const testData = generateTestData(size); + + // Test set performance + const cache = lru(size); + const setStart = performance.now(); + testData.forEach((item) => cache.set(item.key, item.value)); + const setEnd = performance.now(); + const setTime = setEnd - setStart; + + // Test get performance + const getStart = performance.now(); + for (let i = 0; i < 1000; i++) { + const item = testData[Math.floor(Math.random() * testData.length)]; + cache.get(item.key); + } + const getEnd = performance.now(); + const getTime = getEnd - getStart; + + results.push({ + Size: size, + "Set Total (ms)": setTime.toFixed(2), + "Set Per Item (ms)": (setTime / size).toFixed(4), + "Get 1K Items (ms)": getTime.toFixed(2), + "Get Per Item (ms)": (getTime / 1000).toFixed(4), + }); + } + + console.table(results); } // Main execution -async function runAllPerformanceTests () { - console.log("🔬 Node.js Performance API Benchmarks"); - console.log("======================================"); - console.log(`Node.js version: ${process.version}`); - console.log(`Platform: ${process.platform} ${process.arch}`); - console.log(`Date: ${new Date().toISOString()}`); - - try { - await runPerformanceBenchmarks(); - await runScalabilityTest(); - - console.log("\n✅ Performance tests completed!"); - console.log("\n📋 Notes:"); - console.log("- Benchmarks: High-resolution timing with statistical analysis using CustomTimer (based on performance.now())"); - console.log("- Scalability Test: Shows how performance scales with cache size"); - - } catch (error) { - console.error("❌ Performance test failed:", error); - process.exit(1); - } +async function runAllPerformanceTests() { + console.log("🔬 Node.js Performance API Benchmarks"); + console.log("======================================"); + console.log(`Node.js version: ${process.version}`); + console.log(`Platform: ${process.platform} ${process.arch}`); + console.log(`Date: ${new Date().toISOString()}`); + + try { + await runPerformanceBenchmarks(); + await runScalabilityTest(); + + console.log("\n✅ Performance tests completed!"); + console.log("\n📋 Notes:"); + console.log( + "- Benchmarks: High-resolution timing with statistical analysis using CustomTimer (based on performance.now())", + ); + console.log("- Scalability Test: Shows how performance scales with cache size"); + } catch (error) { + console.error("❌ Performance test failed:", error); + process.exit(1); + } } // Allow running this file directly if (import.meta.url === `file://${process.argv[1]}`) { - runAllPerformanceTests(); + runAllPerformanceTests(); } -export { - runAllPerformanceTests, - runPerformanceBenchmarks, - runScalabilityTest, - CustomTimer -}; +export { runAllPerformanceTests, runPerformanceBenchmarks, runScalabilityTest, CustomTimer }; diff --git a/dist/tiny-lru.cjs b/dist/tiny-lru.cjs index f6ddf69..478edac 100644 --- a/dist/tiny-lru.cjs +++ b/dist/tiny-lru.cjs @@ -289,11 +289,7 @@ class LRU { item.prev = this.last; item.next = null; - - if (this.last !== null) { - this.last.next = item; - } - + this.last.next = item; this.last = item; } diff --git a/dist/tiny-lru.js b/dist/tiny-lru.js index ce91e51..6031d8a 100644 --- a/dist/tiny-lru.js +++ b/dist/tiny-lru.js @@ -287,11 +287,7 @@ class LRU { item.prev = this.last; item.next = null; - - if (this.last !== null) { - this.last.next = item; - } - + this.last.next = item; this.last = item; } diff --git a/dist/tiny-lru.min.js b/dist/tiny-lru.min.js index 738a943..382c0c0 100644 --- a/dist/tiny-lru.min.js +++ b/dist/tiny-lru.min.js @@ -2,4 +2,4 @@ 2026 Jason Mulligan @version 11.4.7 */ -class t{constructor(t=0,s=0,i=!1){this.first=null,this.items=Object.create(null),this.last=null,this.max=t,this.resetTtl=i,this.size=0,this.ttl=s}clear(){return this.first=null,this.items=Object.create(null),this.last=null,this.size=0,this}delete(t){const s=this.items[t];return void 0!==s&&(delete this.items[t],this.size--,null!==s.prev&&(s.prev.next=s.next),null!==s.next&&(s.next.prev=s.prev),this.first===s&&(this.first=s.next),this.last===s&&(this.last=s.prev),s.prev=null,s.next=null),this}entries(t){void 0===t&&(t=this.keys());const s=Array.from({length:t.length});for(let i=0;i0){const t=this.first;if(!t)return this;delete this.items[t.key],0==--this.size?(this.first=null,this.last=null):(this.first=t.next,this.first.prev=null),t.next=null}return this}expiresAt(t){const s=this.items[t];return void 0!==s?s.expiry:void 0}get(t){const s=this.items[t];if(void 0!==s)return this.ttl>0&&s.expiry<=Date.now()?void this.delete(t):(this.moveToEnd(s),s.value)}has(t){const s=this.items[t];return void 0!==s&&(0===this.ttl||s.expiry>Date.now())}moveToEnd(t){this.last!==t&&(null!==t.prev&&(t.prev.next=t.next),null!==t.next&&(t.next.prev=t.prev),this.first===t&&(this.first=t.next),t.prev=this.last,t.next=null,null!==this.last&&(this.last.next=t),this.last=t)}keys(){const t=Array.from({length:this.size});let s=this.first,i=0;for(;null!==s;)t[i++]=s.key,s=s.next;return t}setWithEvicted(t,s,i=this.resetTtl){let e=null,l=this.items[t];return void 0!==l?(l.value=s,i&&(l.expiry=this.ttl>0?Date.now()+this.ttl:this.ttl),this.moveToEnd(l)):(this.max>0&&this.size===this.max&&(e={key:this.first.key,value:this.first.value,expiry:this.first.expiry},this.evict(!0)),l=this.items[t]={expiry:this.ttl>0?Date.now()+this.ttl:this.ttl,key:t,prev:this.last,next:null,value:s},1==++this.size?this.first=l:this.last.next=l,this.last=l),e}set(t,s,i=!1,e=this.resetTtl){let l=this.items[t];return i||void 0!==l?(l.value=s,!1===i&&e&&(l.expiry=this.ttl>0?Date.now()+this.ttl:this.ttl),this.moveToEnd(l)):(this.max>0&&this.size===this.max&&this.evict(!0),l=this.items[t]={expiry:this.ttl>0?Date.now()+this.ttl:this.ttl,key:t,prev:this.last,next:null,value:s},1==++this.size?this.first=l:this.last.next=l,this.last=l),this}values(t){void 0===t&&(t=this.keys());const s=Array.from({length:t.length});for(let i=0;i0){const t=this.first;if(!t)return this;delete this.items[t.key],0==--this.size?(this.first=null,this.last=null):(this.first=t.next,this.first.prev=null),t.next=null}return this}expiresAt(t){const s=this.items[t];return void 0!==s?s.expiry:void 0}get(t){const s=this.items[t];if(void 0!==s)return this.ttl>0&&s.expiry<=Date.now()?void this.delete(t):(this.moveToEnd(s),s.value)}has(t){const s=this.items[t];return void 0!==s&&(0===this.ttl||s.expiry>Date.now())}moveToEnd(t){this.last!==t&&(null!==t.prev&&(t.prev.next=t.next),null!==t.next&&(t.next.prev=t.prev),this.first===t&&(this.first=t.next),t.prev=this.last,t.next=null,this.last.next=t,this.last=t)}keys(){const t=Array.from({length:this.size});let s=this.first,e=0;for(;null!==s;)t[e++]=s.key,s=s.next;return t}setWithEvicted(t,s,e=this.resetTtl){let i=null,l=this.items[t];return void 0!==l?(l.value=s,e&&(l.expiry=this.ttl>0?Date.now()+this.ttl:this.ttl),this.moveToEnd(l)):(this.max>0&&this.size===this.max&&(i={key:this.first.key,value:this.first.value,expiry:this.first.expiry},this.evict(!0)),l=this.items[t]={expiry:this.ttl>0?Date.now()+this.ttl:this.ttl,key:t,prev:this.last,next:null,value:s},1==++this.size?this.first=l:this.last.next=l,this.last=l),i}set(t,s,e=!1,i=this.resetTtl){let l=this.items[t];return e||void 0!==l?(l.value=s,!1===e&&i&&(l.expiry=this.ttl>0?Date.now()+this.ttl:this.ttl),this.moveToEnd(l)):(this.max>0&&this.size===this.max&&this.evict(!0),l=this.items[t]={expiry:this.ttl>0?Date.now()+this.ttl:this.ttl,key:t,prev:this.last,next:null,value:s},1==++this.size?this.first=l:this.last.next=l,this.last=l),this}values(t){void 0===t&&(t=this.keys());const s=Array.from({length:t.length});for(let e=0;e>} Array of [key, value] pairs in LRU order.\n\t * @example\n\t * cache.set('a', 1).set('b', 2);\n\t * console.log(cache.entries()); // [['a', 1], ['b', 2]]\n\t * console.log(cache.entries(['a'])); // [['a', 1]]\n\t * @see {@link LRU#keys}\n\t * @see {@link LRU#values}\n\t * @since 11.1.0\n\t */\n\tentries (keys) {\n\t\tif (keys === undefined) {\n\t\t\tkeys = this.keys();\n\t\t}\n\n\t\tconst result = Array.from({ length: keys.length });\n\t\tfor (let i = 0; i < keys.length; i++) {\n\t\t\tconst key = keys[i];\n\t\t\tconst item = this.items[key];\n\t\t\tresult[i] = [key, item !== undefined ? item.value : undefined];\n\t\t}\n\n\t\treturn result;\n\t}\n\n\t/**\n\t * Removes the least recently used item from the cache.\n\t *\n\t * @method evict\n\t * @memberof LRU\n\t * @param {boolean} [bypass=false] - Whether to force eviction even when cache is empty.\n\t * @returns {LRU} The LRU instance for method chaining.\n\t * @example\n\t * cache.set('old', 'value').set('new', 'value');\n\t * cache.evict(); // Removes 'old' item\n\t * @see {@link LRU#setWithEvicted}\n\t * @since 1.0.0\n\t */\n\tevict (bypass = false) {\n\t\tif (bypass || this.size > 0) {\n\t\t\tconst item = this.first;\n\n\t\t\tif (!item) {\n\t\t\t\treturn this;\n\t\t\t}\n\n\t\t\tdelete this.items[item.key];\n\n\t\t\tif (--this.size === 0) {\n\t\t\t\tthis.first = null;\n\t\t\t\tthis.last = null;\n\t\t\t} else {\n\t\t\t\tthis.first = item.next;\n\t\t\t\tthis.first.prev = null;\n\t\t\t}\n\n\t\t\titem.next = null;\n\t\t}\n\n\t\treturn this;\n\t}\n\n\t/**\n\t * Returns the expiration timestamp for a given key.\n\t *\n\t * @method expiresAt\n\t * @memberof LRU\n\t * @param {string} key - The key to check expiration for.\n\t * @returns {number|undefined} The expiration timestamp in milliseconds, or undefined if key doesn't exist.\n\t * @example\n\t * const cache = new LRU(100, 5000); // 5 second TTL\n\t * cache.set('key1', 'value1');\n\t * console.log(cache.expiresAt('key1')); // timestamp 5 seconds from now\n\t * @see {@link LRU#get}\n\t * @see {@link LRU#has}\n\t * @since 1.0.0\n\t */\n\texpiresAt (key) {\n\t\tconst item = this.items[key];\n\t\treturn item !== undefined ? item.expiry : undefined;\n\t}\n\n\t/**\n\t * Retrieves a value from the cache by key. Updates the item's position to most recently used.\n\t *\n\t * @method get\n\t * @memberof LRU\n\t * @param {string} key - The key to retrieve.\n\t * @returns {*} The value associated with the key, or undefined if not found or expired.\n\t * @example\n\t * cache.set('key1', 'value1');\n\t * console.log(cache.get('key1')); // 'value1'\n\t * console.log(cache.get('nonexistent')); // undefined\n\t * @see {@link LRU#set}\n\t * @see {@link LRU#has}\n\t * @since 1.0.0\n\t */\n\tget (key) {\n\t\tconst item = this.items[key];\n\n\t\tif (item !== undefined) {\n\t\t\t// Check TTL only if enabled to avoid unnecessary Date.now() calls\n\t\t\tif (this.ttl > 0) {\n\t\t\t\tif (item.expiry <= Date.now()) {\n\t\t\t\t\tthis.delete(key);\n\n\t\t\t\t\treturn undefined;\n\t\t\t\t}\n\t\t\t}\n\n\t\t\t// Fast LRU update without full set() overhead\n\t\t\tthis.moveToEnd(item);\n\n\t\t\treturn item.value;\n\t\t}\n\n\t\treturn undefined;\n\t}\n\n\t/**\n\t * Checks if a key exists in the cache.\n\t *\n\t * @method has\n\t * @memberof LRU\n\t * @param {string} key - The key to check for.\n\t * @returns {boolean} True if the key exists, false otherwise.\n\t * @example\n\t * cache.set('key1', 'value1');\n\t * console.log(cache.has('key1')); // true\n\t * console.log(cache.has('nonexistent')); // false\n\t * @see {@link LRU#get}\n\t * @see {@link LRU#delete}\n\t * @since 9.0.0\n\t */\n\thas (key) {\n\t\tconst item = this.items[key];\n\t\treturn item !== undefined && (this.ttl === 0 || item.expiry > Date.now());\n\t}\n\n\t/**\n\t * Efficiently moves an item to the end of the LRU list (most recently used position).\n\t * This is an internal optimization method that avoids the overhead of the full set() operation\n\t * when only LRU position needs to be updated.\n\t *\n\t * @method moveToEnd\n\t * @memberof LRU\n\t * @param {Object} item - The cache item with prev/next pointers to reposition.\n\t * @private\n\t * @since 11.3.5\n\t */\n\tmoveToEnd (item) {\n\t\tif (this.last === item) {\n\t\t\treturn;\n\t\t}\n\n\t\tif (item.prev !== null) {\n\t\t\titem.prev.next = item.next;\n\t\t}\n\n\t\tif (item.next !== null) {\n\t\t\titem.next.prev = item.prev;\n\t\t}\n\n\t\tif (this.first === item) {\n\t\t\tthis.first = item.next;\n\t\t}\n\n\t\titem.prev = this.last;\n\t\titem.next = null;\n\n\t\tif (this.last !== null) {\n\t\t\tthis.last.next = item;\n\t\t}\n\n\t\tthis.last = item;\n\t}\n\n\t/**\n\t * Returns an array of all keys in the cache, ordered from least to most recently used.\n\t *\n\t * @method keys\n\t * @memberof LRU\n\t * @returns {string[]} Array of keys in LRU order.\n\t * @example\n\t * cache.set('a', 1).set('b', 2);\n\t * cache.get('a'); // Move 'a' to most recent\n\t * console.log(cache.keys()); // ['b', 'a']\n\t * @see {@link LRU#values}\n\t * @see {@link LRU#entries}\n\t * @since 9.0.0\n\t */\n\tkeys () {\n\t\tconst result = Array.from({ length: this.size });\n\t\tlet x = this.first;\n\t\tlet i = 0;\n\n\t\twhile (x !== null) {\n\t\t\tresult[i++] = x.key;\n\t\t\tx = x.next;\n\t\t}\n\n\t\treturn result;\n\t}\n\n\t/**\n\t * Sets a value in the cache and returns any evicted item.\n\t *\n\t * @method setWithEvicted\n\t * @memberof LRU\n\t * @param {string} key - The key to set.\n\t * @param {*} value - The value to store.\n\t * @param {boolean} [resetTtl=this.resetTtl] - Whether to reset the TTL for this operation.\n\t * @returns {Object|null} The evicted item (if any) with shape {key, value, expiry, prev, next}, or null.\n\t * @example\n\t * const cache = new LRU(2);\n\t * cache.set('a', 1).set('b', 2);\n\t * const evicted = cache.setWithEvicted('c', 3); // evicted = {key: 'a', value: 1, ...}\n\t * @see {@link LRU#set}\n\t * @see {@link LRU#evict}\n\t * @since 11.3.0\n\t */\n\tsetWithEvicted (key, value, resetTtl = this.resetTtl) {\n\t\tlet evicted = null;\n\t\tlet item = this.items[key];\n\n\t\tif (item !== undefined) {\n\t\t\titem.value = value;\n\t\t\tif (resetTtl) {\n\t\t\t\titem.expiry = this.ttl > 0 ? Date.now() + this.ttl : this.ttl;\n\t\t\t}\n\t\t\tthis.moveToEnd(item);\n\t\t} else {\n\t\t\tif (this.max > 0 && this.size === this.max) {\n\t\t\t\tevicted = {\n\t\t\t\t\tkey: this.first.key,\n\t\t\t\t\tvalue: this.first.value,\n\t\t\t\t\texpiry: this.first.expiry\n\t\t\t\t};\n\t\t\t\tthis.evict(true);\n\t\t\t}\n\n\t\t\titem = this.items[key] = {\n\t\t\t\texpiry: this.ttl > 0 ? Date.now() + this.ttl : this.ttl,\n\t\t\t\tkey: key,\n\t\t\t\tprev: this.last,\n\t\t\t\tnext: null,\n\t\t\t\tvalue\n\t\t\t};\n\n\t\t\tif (++this.size === 1) {\n\t\t\t\tthis.first = item;\n\t\t\t} else {\n\t\t\t\tthis.last.next = item;\n\t\t\t}\n\n\t\t\tthis.last = item;\n\t\t}\n\n\t\treturn evicted;\n\t}\n\n\t/**\n\t * Sets a value in the cache. Updates the item's position to most recently used.\n\t *\n\t * @method set\n\t * @memberof LRU\n\t * @param {string} key - The key to set.\n\t * @param {*} value - The value to store.\n\t * @param {boolean} [bypass=false] - Internal parameter for setWithEvicted method.\n\t * @param {boolean} [resetTtl=this.resetTtl] - Whether to reset the TTL for this operation.\n\t * @returns {LRU} The LRU instance for method chaining.\n\t * @example\n\t * cache.set('key1', 'value1')\n\t * .set('key2', 'value2')\n\t * .set('key3', 'value3');\n\t * @see {@link LRU#get}\n\t * @see {@link LRU#setWithEvicted}\n\t * @since 1.0.0\n\t */\n\tset (key, value, bypass = false, resetTtl = this.resetTtl) {\n\t\tlet item = this.items[key];\n\n\t\tif (bypass || item !== undefined) {\n\t\t\t// Existing item: update value and position\n\t\t\titem.value = value;\n\n\t\t\tif (bypass === false && resetTtl) {\n\t\t\t\titem.expiry = this.ttl > 0 ? 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Defaults to all keys.\n\t * @returns {Array<*>} Array of values corresponding to the keys in LRU order.\n\t * @example\n\t * cache.set('a', 1).set('b', 2);\n\t * console.log(cache.values()); // [1, 2]\n\t * console.log(cache.values(['a'])); // [1]\n\t * @see {@link LRU#keys}\n\t * @see {@link LRU#entries}\n\t * @since 11.1.0\n\t */\n\tvalues (keys) {\n\t\tif (keys === undefined) {\n\t\t\tkeys = this.keys();\n\t\t}\n\n\t\tconst result = Array.from({ length: keys.length });\n\t\tfor (let i = 0; i < keys.length; i++) {\n\t\t\tconst item = this.items[keys[i]];\n\t\t\tresult[i] = item !== undefined ? item.value : undefined;\n\t\t}\n\n\t\treturn result;\n\t}\n}\n\n/**\n * Factory function to create a new LRU cache instance with parameter validation.\n *\n * @function lru\n * @param {number} [max=1000] - Maximum number of items to store. Must be >= 0. Use 0 for unlimited size.\n * @param {number} [ttl=0] - Time to live in milliseconds. Must be >= 0. 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\ No newline at end of file +{"version":3,"file":"tiny-lru.min.js","sources":["../src/lru.js"],"sourcesContent":["/**\n * A high-performance Least Recently Used (LRU) cache implementation with optional TTL support.\n * Items are automatically evicted when the cache reaches its maximum size,\n * removing the least recently used items first. All core operations (get, set, delete) are O(1).\n *\n * @class LRU\n * @example\n * // Create a cache with max 100 items\n * const cache = new LRU(100);\n * cache.set('key1', 'value1');\n * console.log(cache.get('key1')); // 'value1'\n *\n * @example\n * // Create a cache with TTL\n * const cache = new LRU(100, 5000); // 5 second TTL\n * cache.set('key1', 'value1');\n * // After 5 seconds, key1 will be expired\n */\nexport class LRU {\n\t/**\n\t * Creates a new LRU cache instance.\n\t * Note: Constructor does not validate parameters. Use lru() factory function for parameter validation.\n\t *\n\t * @constructor\n\t * @param {number} [max=0] - Maximum number of items to store. 0 means unlimited.\n\t * @param {number} [ttl=0] - Time to live in milliseconds. 0 means no expiration.\n\t * @param {boolean} [resetTtl=false] - Whether to reset TTL when accessing existing items via get().\n\t * @example\n\t * const cache = new LRU(1000, 60000, true); // 1000 items, 1 minute TTL, reset on access\n\t * @see {@link lru} For parameter validation\n\t * @since 1.0.0\n\t */\n\tconstructor (max = 0, ttl = 0, resetTtl = false) {\n\t\tthis.first = null;\n\t\tthis.items = Object.create(null);\n\t\tthis.last = null;\n\t\tthis.max = max;\n\t\tthis.resetTtl = resetTtl;\n\t\tthis.size = 0;\n\t\tthis.ttl = ttl;\n\t}\n\n\t/**\n\t * Removes all items from the cache.\n\t *\n\t * @method clear\n\t * @memberof LRU\n\t * @returns {LRU} The LRU instance for method chaining.\n\t * @example\n\t * cache.clear();\n\t * console.log(cache.size); // 0\n\t * @since 1.0.0\n\t */\n\tclear () {\n\t\tthis.first = null;\n\t\tthis.items = Object.create(null);\n\t\tthis.last = null;\n\t\tthis.size = 0;\n\n\t\treturn this;\n\t}\n\n\t/**\n\t * Removes an item from the cache by key.\n\t *\n\t * @method delete\n\t * @memberof LRU\n\t * @param {string} key - The key of the item to delete.\n\t * @returns {LRU} The LRU instance for method chaining.\n\t * @example\n\t * cache.set('key1', 'value1');\n\t * cache.delete('key1');\n\t * console.log(cache.has('key1')); // false\n\t * @see {@link LRU#has}\n\t * @see {@link LRU#clear}\n\t * @since 1.0.0\n\t */\n\tdelete (key) {\n\t\tconst item = this.items[key];\n\n\t\tif (item !== undefined) {\n\t\t\tdelete this.items[key];\n\t\t\tthis.size--;\n\n\t\t\tif (item.prev !== null) {\n\t\t\t\titem.prev.next = item.next;\n\t\t\t}\n\n\t\t\tif (item.next !== null) {\n\t\t\t\titem.next.prev = item.prev;\n\t\t\t}\n\n\t\t\tif (this.first === item) {\n\t\t\t\tthis.first = item.next;\n\t\t\t}\n\n\t\t\tif (this.last === item) {\n\t\t\t\tthis.last = item.prev;\n\t\t\t}\n\n\t\t\titem.prev = null;\n\t\t\titem.next = null;\n\t\t}\n\n\t\treturn this;\n\t}\n\n\t/**\n\t * Returns an array of [key, value] pairs for the specified keys.\n\t * Order follows LRU order (least to most recently used).\n\t *\n\t * @method entries\n\t * @memberof LRU\n\t * @param {string[]} [keys=this.keys()] - Array of keys to get entries for. Defaults to all keys.\n\t * @returns {Array>} Array of [key, value] pairs in LRU order.\n\t * @example\n\t * cache.set('a', 1).set('b', 2);\n\t * console.log(cache.entries()); // [['a', 1], ['b', 2]]\n\t * console.log(cache.entries(['a'])); // [['a', 1]]\n\t * @see {@link LRU#keys}\n\t * @see {@link LRU#values}\n\t * @since 11.1.0\n\t */\n\tentries (keys) {\n\t\tif (keys === undefined) {\n\t\t\tkeys = this.keys();\n\t\t}\n\n\t\tconst result = Array.from({ length: keys.length });\n\t\tfor (let i = 0; i < keys.length; i++) {\n\t\t\tconst key = keys[i];\n\t\t\tconst item = this.items[key];\n\t\t\tresult[i] = [key, item !== undefined ? item.value : undefined];\n\t\t}\n\n\t\treturn result;\n\t}\n\n\t/**\n\t * Removes the least recently used item from the cache.\n\t *\n\t * @method evict\n\t * @memberof LRU\n\t * @param {boolean} [bypass=false] - Whether to force eviction even when cache is empty.\n\t * @returns {LRU} The LRU instance for method chaining.\n\t * @example\n\t * cache.set('old', 'value').set('new', 'value');\n\t * cache.evict(); // Removes 'old' item\n\t * @see {@link LRU#setWithEvicted}\n\t * @since 1.0.0\n\t */\n\tevict (bypass = false) {\n\t\tif (bypass || this.size > 0) {\n\t\t\tconst item = this.first;\n\n\t\t\tif (!item) {\n\t\t\t\treturn this;\n\t\t\t}\n\n\t\t\tdelete this.items[item.key];\n\n\t\t\tif (--this.size === 0) {\n\t\t\t\tthis.first = null;\n\t\t\t\tthis.last = null;\n\t\t\t} else {\n\t\t\t\tthis.first = item.next;\n\t\t\t\tthis.first.prev = null;\n\t\t\t}\n\n\t\t\titem.next = null;\n\t\t}\n\n\t\treturn this;\n\t}\n\n\t/**\n\t * Returns the expiration timestamp for a given key.\n\t *\n\t * @method expiresAt\n\t * @memberof LRU\n\t * @param {string} key - The key to check expiration for.\n\t * @returns {number|undefined} The expiration timestamp in milliseconds, or undefined if key doesn't exist.\n\t * @example\n\t * const cache = new LRU(100, 5000); // 5 second TTL\n\t * cache.set('key1', 'value1');\n\t * console.log(cache.expiresAt('key1')); // timestamp 5 seconds from now\n\t * @see {@link LRU#get}\n\t * @see {@link LRU#has}\n\t * @since 1.0.0\n\t */\n\texpiresAt (key) {\n\t\tconst item = this.items[key];\n\t\treturn item !== undefined ? item.expiry : undefined;\n\t}\n\n\t/**\n\t * Retrieves a value from the cache by key. Updates the item's position to most recently used.\n\t *\n\t * @method get\n\t * @memberof LRU\n\t * @param {string} key - The key to retrieve.\n\t * @returns {*} The value associated with the key, or undefined if not found or expired.\n\t * @example\n\t * cache.set('key1', 'value1');\n\t * console.log(cache.get('key1')); // 'value1'\n\t * console.log(cache.get('nonexistent')); // undefined\n\t * @see {@link LRU#set}\n\t * @see {@link LRU#has}\n\t * @since 1.0.0\n\t */\n\tget (key) {\n\t\tconst item = this.items[key];\n\n\t\tif (item !== undefined) {\n\t\t\t// Check TTL only if enabled to avoid unnecessary Date.now() calls\n\t\t\tif (this.ttl > 0) {\n\t\t\t\tif (item.expiry <= Date.now()) {\n\t\t\t\t\tthis.delete(key);\n\n\t\t\t\t\treturn undefined;\n\t\t\t\t}\n\t\t\t}\n\n\t\t\t// Fast LRU update without full set() overhead\n\t\t\tthis.moveToEnd(item);\n\n\t\t\treturn item.value;\n\t\t}\n\n\t\treturn undefined;\n\t}\n\n\t/**\n\t * Checks if a key exists in the cache.\n\t *\n\t * @method has\n\t * @memberof LRU\n\t * @param {string} key - The key to check for.\n\t * @returns {boolean} True if the key exists, false otherwise.\n\t * @example\n\t * cache.set('key1', 'value1');\n\t * console.log(cache.has('key1')); // true\n\t * console.log(cache.has('nonexistent')); // false\n\t * @see {@link LRU#get}\n\t * @see {@link LRU#delete}\n\t * @since 9.0.0\n\t */\n\thas (key) {\n\t\tconst item = this.items[key];\n\t\treturn item !== undefined && (this.ttl === 0 || item.expiry > Date.now());\n\t}\n\n\t/**\n\t * Efficiently moves an item to the end of the LRU list (most recently used position).\n\t * This is an internal optimization method that avoids the overhead of the full set() operation\n\t * when only LRU position needs to be updated.\n\t *\n\t * @method moveToEnd\n\t * @memberof LRU\n\t * @param {Object} item - The cache item with prev/next pointers to reposition.\n\t * @private\n\t * @since 11.3.5\n\t */\n\tmoveToEnd (item) {\n\t\tif (this.last === item) {\n\t\t\treturn;\n\t\t}\n\n\t\tif (item.prev !== null) {\n\t\t\titem.prev.next = item.next;\n\t\t}\n\n\t\tif (item.next !== null) {\n\t\t\titem.next.prev = item.prev;\n\t\t}\n\n\t\tif (this.first === item) {\n\t\t\tthis.first = item.next;\n\t\t}\n\n\t\titem.prev = this.last;\n\t\titem.next = null;\n\t\tthis.last.next = item;\n\t\tthis.last = item;\n\t}\n\n\t/**\n\t * Returns an array of all keys in the cache, ordered from least to most recently used.\n\t *\n\t * @method keys\n\t * @memberof LRU\n\t * @returns {string[]} Array of keys in LRU order.\n\t * @example\n\t * cache.set('a', 1).set('b', 2);\n\t * cache.get('a'); // Move 'a' to most recent\n\t * console.log(cache.keys()); // ['b', 'a']\n\t * @see {@link LRU#values}\n\t * @see {@link LRU#entries}\n\t * @since 9.0.0\n\t */\n\tkeys () {\n\t\tconst result = Array.from({ length: this.size });\n\t\tlet x = this.first;\n\t\tlet i = 0;\n\n\t\twhile (x !== null) {\n\t\t\tresult[i++] = x.key;\n\t\t\tx = x.next;\n\t\t}\n\n\t\treturn result;\n\t}\n\n\t/**\n\t * Sets a value in the cache and returns any evicted item.\n\t *\n\t * @method setWithEvicted\n\t * @memberof LRU\n\t * @param {string} key - The key to set.\n\t * @param {*} value - The value to store.\n\t * @param {boolean} [resetTtl=this.resetTtl] - Whether to reset the TTL for this operation.\n\t * @returns {Object|null} The evicted item (if any) with shape {key, value, expiry, prev, next}, or null.\n\t * @example\n\t * const cache = new LRU(2);\n\t * cache.set('a', 1).set('b', 2);\n\t * const evicted = cache.setWithEvicted('c', 3); // evicted = {key: 'a', value: 1, ...}\n\t * @see {@link LRU#set}\n\t * @see {@link LRU#evict}\n\t * @since 11.3.0\n\t */\n\tsetWithEvicted (key, value, resetTtl = this.resetTtl) {\n\t\tlet evicted = null;\n\t\tlet item = this.items[key];\n\n\t\tif (item !== undefined) {\n\t\t\titem.value = value;\n\t\t\tif (resetTtl) {\n\t\t\t\titem.expiry = this.ttl > 0 ? Date.now() + this.ttl : this.ttl;\n\t\t\t}\n\t\t\tthis.moveToEnd(item);\n\t\t} else {\n\t\t\tif (this.max > 0 && this.size === this.max) {\n\t\t\t\tevicted = {\n\t\t\t\t\tkey: this.first.key,\n\t\t\t\t\tvalue: this.first.value,\n\t\t\t\t\texpiry: this.first.expiry\n\t\t\t\t};\n\t\t\t\tthis.evict(true);\n\t\t\t}\n\n\t\t\titem = this.items[key] = {\n\t\t\t\texpiry: this.ttl > 0 ? Date.now() + this.ttl : this.ttl,\n\t\t\t\tkey: key,\n\t\t\t\tprev: this.last,\n\t\t\t\tnext: null,\n\t\t\t\tvalue\n\t\t\t};\n\n\t\t\tif (++this.size === 1) {\n\t\t\t\tthis.first = item;\n\t\t\t} else {\n\t\t\t\tthis.last.next = item;\n\t\t\t}\n\n\t\t\tthis.last = item;\n\t\t}\n\n\t\treturn evicted;\n\t}\n\n\t/**\n\t * Sets a value in the cache. Updates the item's position to most recently used.\n\t *\n\t * @method set\n\t * @memberof LRU\n\t * @param {string} key - The key to set.\n\t * @param {*} value - The value to store.\n\t * @param {boolean} [bypass=false] - Internal parameter for setWithEvicted method.\n\t * @param {boolean} [resetTtl=this.resetTtl] - Whether to reset the TTL for this operation.\n\t * @returns {LRU} The LRU instance for method chaining.\n\t * @example\n\t * cache.set('key1', 'value1')\n\t * .set('key2', 'value2')\n\t * .set('key3', 'value3');\n\t * @see {@link LRU#get}\n\t * @see {@link LRU#setWithEvicted}\n\t * @since 1.0.0\n\t */\n\tset (key, value, bypass = false, resetTtl = this.resetTtl) {\n\t\tlet item = this.items[key];\n\n\t\tif (bypass || item !== undefined) {\n\t\t\t// Existing item: update value and position\n\t\t\titem.value = value;\n\n\t\t\tif (bypass === false && resetTtl) {\n\t\t\t\titem.expiry = this.ttl > 0 ? Date.now() + this.ttl : this.ttl;\n\t\t\t}\n\n\t\t\t// Always move to end, but the bypass parameter affects TTL reset behavior\n\t\t\tthis.moveToEnd(item);\n\t\t} else {\n\t\t\t// New item: check for eviction and create\n\t\t\tif (this.max > 0 && this.size === this.max) {\n\t\t\t\tthis.evict(true);\n\t\t\t}\n\n\t\t\titem = this.items[key] = {\n\t\t\t\texpiry: this.ttl > 0 ? Date.now() + this.ttl : this.ttl,\n\t\t\t\tkey: key,\n\t\t\t\tprev: this.last,\n\t\t\t\tnext: null,\n\t\t\t\tvalue\n\t\t\t};\n\n\t\t\tif (++this.size === 1) {\n\t\t\t\tthis.first = item;\n\t\t\t} else {\n\t\t\t\tthis.last.next = item;\n\t\t\t}\n\n\t\t\tthis.last = item;\n\t\t}\n\n\t\treturn this;\n\t}\n\n\t/**\n\t * Returns an array of all values in the cache for the specified keys.\n\t * Order follows LRU order (least to most recently used).\n\t *\n\t * @method values\n\t * @memberof LRU\n\t * @param {string[]} [keys=this.keys()] - Array of keys to get values for. Defaults to all keys.\n\t * @returns {Array<*>} Array of values corresponding to the keys in LRU order.\n\t * @example\n\t * cache.set('a', 1).set('b', 2);\n\t * console.log(cache.values()); // [1, 2]\n\t * console.log(cache.values(['a'])); // [1]\n\t * @see {@link LRU#keys}\n\t * @see {@link LRU#entries}\n\t * @since 11.1.0\n\t */\n\tvalues (keys) {\n\t\tif (keys === undefined) {\n\t\t\tkeys = this.keys();\n\t\t}\n\n\t\tconst result = Array.from({ length: keys.length });\n\t\tfor (let i = 0; i < keys.length; i++) {\n\t\t\tconst item = this.items[keys[i]];\n\t\t\tresult[i] = item !== undefined ? item.value : undefined;\n\t\t}\n\n\t\treturn result;\n\t}\n}\n\n/**\n * Factory function to create a new LRU cache instance with parameter validation.\n *\n * @function lru\n * @param {number} [max=1000] - Maximum number of items to store. Must be >= 0. Use 0 for unlimited size.\n * @param {number} [ttl=0] - Time to live in milliseconds. Must be >= 0. Use 0 for no expiration.\n * @param {boolean} [resetTtl=false] - Whether to reset TTL when accessing existing items via get().\n * @returns {LRU} A new LRU cache instance.\n * @throws {TypeError} When parameters are invalid (negative numbers or wrong types).\n * @example\n * // Create cache with factory function\n * const cache = lru(100, 5000, true);\n * cache.set('key', 'value');\n *\n * @example\n * // Error handling\n * try {\n * const cache = lru(-1); // Invalid max\n * } catch (error) {\n * console.error(error.message); // \"Invalid max value\"\n * }\n * @see {@link LRU}\n * @since 1.0.0\n */\nexport function lru (max = 1000, ttl = 0, resetTtl = false) {\n\tif (isNaN(max) || max < 0) {\n\t\tthrow new TypeError(\"Invalid max value\");\n\t}\n\n\tif (isNaN(ttl) || ttl < 0) {\n\t\tthrow new TypeError(\"Invalid ttl value\");\n\t}\n\n\tif (typeof resetTtl !== \"boolean\") {\n\t\tthrow new TypeError(\"Invalid resetTtl value\");\n\t}\n\n\treturn new LRU(max, ttl, 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\ No newline at end of file diff --git a/dist/tiny-lru.umd.js b/dist/tiny-lru.umd.js index a001c1e..d2efcfa 100644 --- a/dist/tiny-lru.umd.js +++ b/dist/tiny-lru.umd.js @@ -287,11 +287,7 @@ class LRU { item.prev = this.last; item.next = null; - - if (this.last !== null) { - this.last.next = item; - } - + this.last.next = item; this.last = item; } diff --git a/dist/tiny-lru.umd.min.js b/dist/tiny-lru.umd.min.js index 5a78544..d2b0b70 100644 --- a/dist/tiny-lru.umd.min.js +++ b/dist/tiny-lru.umd.min.js @@ -2,4 +2,4 @@ 2026 Jason Mulligan @version 11.4.7 */ -!function(t,e){"object"==typeof exports&&"undefined"!=typeof module?e(exports):"function"==typeof define&&define.amd?define(["exports"],e):e((t="undefined"!=typeof globalThis?globalThis:t||self).lru={})}(this,(function(t){"use strict";class e{constructor(t=0,e=0,i=!1){this.first=null,this.items=Object.create(null),this.last=null,this.max=t,this.resetTtl=i,this.size=0,this.ttl=e}clear(){return 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0!==e&&(0===this.ttl||e.expiry>Date.now())}moveToEnd(t){this.last!==t&&(null!==t.prev&&(t.prev.next=t.next),null!==t.next&&(t.next.prev=t.prev),this.first===t&&(this.first=t.next),t.prev=this.last,t.next=null,this.last.next=t,this.last=t)}keys(){const t=Array.from({length:this.size});let e=this.first,i=0;for(;null!==e;)t[i++]=e.key,e=e.next;return t}setWithEvicted(t,e,i=this.resetTtl){let s=null,l=this.items[t];return void 0!==l?(l.value=e,i&&(l.expiry=this.ttl>0?Date.now()+this.ttl:this.ttl),this.moveToEnd(l)):(this.max>0&&this.size===this.max&&(s={key:this.first.key,value:this.first.value,expiry:this.first.expiry},this.evict(!0)),l=this.items[t]={expiry:this.ttl>0?Date.now()+this.ttl:this.ttl,key:t,prev:this.last,next:null,value:e},1==++this.size?this.first=l:this.last.next=l,this.last=l),s}set(t,e,i=!1,s=this.resetTtl){let l=this.items[t];return i||void 0!==l?(l.value=e,!1===i&&s&&(l.expiry=this.ttl>0?Date.now()+this.ttl:this.ttl),this.moveToEnd(l)):(this.max>0&&this.size===this.max&&this.evict(!0),l=this.items[t]={expiry:this.ttl>0?Date.now()+this.ttl:this.ttl,key:t,prev:this.last,next:null,value:e},1==++this.size?this.first=l:this.last.next=l,this.last=l),this}values(t){void 0===t&&(t=this.keys());const e=Array.from({length:t.length});for(let i=0;i>} Array of [key, value] pairs in LRU order.\n\t * @example\n\t * cache.set('a', 1).set('b', 2);\n\t * console.log(cache.entries()); // [['a', 1], ['b', 2]]\n\t * console.log(cache.entries(['a'])); // [['a', 1]]\n\t * @see {@link LRU#keys}\n\t * @see {@link LRU#values}\n\t * @since 11.1.0\n\t */\n\tentries (keys) {\n\t\tif (keys === undefined) {\n\t\t\tkeys = this.keys();\n\t\t}\n\n\t\tconst result = Array.from({ length: keys.length });\n\t\tfor (let i = 0; i < keys.length; i++) {\n\t\t\tconst key = keys[i];\n\t\t\tconst item = this.items[key];\n\t\t\tresult[i] = [key, item !== undefined ? 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* @method expiresAt\n\t * @memberof LRU\n\t * @param {string} key - The key to check expiration for.\n\t * @returns {number|undefined} The expiration timestamp in milliseconds, or undefined if key doesn't exist.\n\t * @example\n\t * const cache = new LRU(100, 5000); // 5 second TTL\n\t * cache.set('key1', 'value1');\n\t * console.log(cache.expiresAt('key1')); // timestamp 5 seconds from now\n\t * @see {@link LRU#get}\n\t * @see {@link LRU#has}\n\t * @since 1.0.0\n\t */\n\texpiresAt (key) {\n\t\tconst item = this.items[key];\n\t\treturn item !== undefined ? item.expiry : undefined;\n\t}\n\n\t/**\n\t * Retrieves a value from the cache by key. 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Date.now() + this.ttl : this.ttl;\n\t\t\t}\n\t\t\tthis.moveToEnd(item);\n\t\t} else {\n\t\t\tif (this.max > 0 && this.size === this.max) {\n\t\t\t\tevicted = {\n\t\t\t\t\tkey: this.first.key,\n\t\t\t\t\tvalue: this.first.value,\n\t\t\t\t\texpiry: this.first.expiry\n\t\t\t\t};\n\t\t\t\tthis.evict(true);\n\t\t\t}\n\n\t\t\titem = this.items[key] = {\n\t\t\t\texpiry: this.ttl > 0 ? Date.now() + this.ttl : this.ttl,\n\t\t\t\tkey: key,\n\t\t\t\tprev: this.last,\n\t\t\t\tnext: null,\n\t\t\t\tvalue\n\t\t\t};\n\n\t\t\tif (++this.size === 1) {\n\t\t\t\tthis.first = item;\n\t\t\t} else {\n\t\t\t\tthis.last.next = item;\n\t\t\t}\n\n\t\t\tthis.last = item;\n\t\t}\n\n\t\treturn evicted;\n\t}\n\n\t/**\n\t * Sets a value in the cache. 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\ No newline at end of file +{"version":3,"file":"tiny-lru.umd.min.js","sources":["../src/lru.js"],"sourcesContent":["/**\n * A high-performance Least Recently Used (LRU) cache implementation with optional TTL support.\n * Items are automatically evicted when the cache reaches its maximum size,\n * removing the least recently used items first. All core operations (get, set, delete) are O(1).\n *\n * @class LRU\n * @example\n * // Create a cache with max 100 items\n * const cache = new LRU(100);\n * cache.set('key1', 'value1');\n * console.log(cache.get('key1')); // 'value1'\n *\n * @example\n * // Create a cache with TTL\n * const cache = new LRU(100, 5000); // 5 second TTL\n * cache.set('key1', 'value1');\n * // After 5 seconds, key1 will be expired\n */\nexport class LRU {\n\t/**\n\t * Creates a new LRU cache instance.\n\t * Note: Constructor does not validate parameters. Use lru() factory function for parameter validation.\n\t *\n\t * @constructor\n\t * @param {number} [max=0] - Maximum number of items to store. 0 means unlimited.\n\t * @param {number} [ttl=0] - Time to live in milliseconds. 0 means no expiration.\n\t * @param {boolean} [resetTtl=false] - Whether to reset TTL when accessing existing items via get().\n\t * @example\n\t * const cache = new LRU(1000, 60000, true); // 1000 items, 1 minute TTL, reset on access\n\t * @see {@link lru} For parameter validation\n\t * @since 1.0.0\n\t */\n\tconstructor (max = 0, ttl = 0, resetTtl = false) {\n\t\tthis.first = null;\n\t\tthis.items = Object.create(null);\n\t\tthis.last = null;\n\t\tthis.max = max;\n\t\tthis.resetTtl = resetTtl;\n\t\tthis.size = 0;\n\t\tthis.ttl = ttl;\n\t}\n\n\t/**\n\t * Removes all items from the cache.\n\t *\n\t * @method clear\n\t * @memberof LRU\n\t * @returns {LRU} The LRU instance for method chaining.\n\t * @example\n\t * cache.clear();\n\t * console.log(cache.size); // 0\n\t * @since 1.0.0\n\t */\n\tclear () {\n\t\tthis.first = null;\n\t\tthis.items = Object.create(null);\n\t\tthis.last = null;\n\t\tthis.size = 0;\n\n\t\treturn this;\n\t}\n\n\t/**\n\t * Removes an item from the cache by key.\n\t *\n\t * @method delete\n\t * @memberof LRU\n\t * @param {string} key - The key of the item to delete.\n\t * @returns {LRU} The LRU instance for method chaining.\n\t * @example\n\t * cache.set('key1', 'value1');\n\t * cache.delete('key1');\n\t * console.log(cache.has('key1')); // false\n\t * @see {@link LRU#has}\n\t * @see {@link LRU#clear}\n\t * @since 1.0.0\n\t */\n\tdelete (key) {\n\t\tconst item = this.items[key];\n\n\t\tif (item !== undefined) {\n\t\t\tdelete this.items[key];\n\t\t\tthis.size--;\n\n\t\t\tif (item.prev !== null) {\n\t\t\t\titem.prev.next = item.next;\n\t\t\t}\n\n\t\t\tif (item.next !== null) {\n\t\t\t\titem.next.prev = item.prev;\n\t\t\t}\n\n\t\t\tif (this.first === item) {\n\t\t\t\tthis.first = item.next;\n\t\t\t}\n\n\t\t\tif (this.last === item) {\n\t\t\t\tthis.last = item.prev;\n\t\t\t}\n\n\t\t\titem.prev = null;\n\t\t\titem.next = null;\n\t\t}\n\n\t\treturn this;\n\t}\n\n\t/**\n\t * Returns an array of [key, value] pairs for the specified keys.\n\t * Order follows LRU order (least to most recently used).\n\t *\n\t * @method entries\n\t * @memberof LRU\n\t * @param {string[]} [keys=this.keys()] - Array of keys to get entries for. Defaults to all keys.\n\t * @returns {Array>} Array of [key, value] pairs in LRU order.\n\t * @example\n\t * cache.set('a', 1).set('b', 2);\n\t * console.log(cache.entries()); // [['a', 1], ['b', 2]]\n\t * console.log(cache.entries(['a'])); // [['a', 1]]\n\t * @see {@link LRU#keys}\n\t * @see {@link LRU#values}\n\t * @since 11.1.0\n\t */\n\tentries (keys) {\n\t\tif (keys === undefined) {\n\t\t\tkeys = this.keys();\n\t\t}\n\n\t\tconst result = Array.from({ length: keys.length });\n\t\tfor (let i = 0; i < keys.length; i++) {\n\t\t\tconst key = keys[i];\n\t\t\tconst item = this.items[key];\n\t\t\tresult[i] = [key, item !== undefined ? item.value : undefined];\n\t\t}\n\n\t\treturn result;\n\t}\n\n\t/**\n\t * Removes the least recently used item from the cache.\n\t *\n\t * @method evict\n\t * @memberof LRU\n\t * @param {boolean} [bypass=false] - Whether to force eviction even when cache is empty.\n\t * @returns {LRU} The LRU instance for method chaining.\n\t * @example\n\t * cache.set('old', 'value').set('new', 'value');\n\t * cache.evict(); // Removes 'old' item\n\t * @see {@link LRU#setWithEvicted}\n\t * @since 1.0.0\n\t */\n\tevict (bypass = false) {\n\t\tif (bypass || this.size > 0) {\n\t\t\tconst item = this.first;\n\n\t\t\tif (!item) {\n\t\t\t\treturn this;\n\t\t\t}\n\n\t\t\tdelete this.items[item.key];\n\n\t\t\tif (--this.size === 0) {\n\t\t\t\tthis.first = null;\n\t\t\t\tthis.last = null;\n\t\t\t} else {\n\t\t\t\tthis.first = item.next;\n\t\t\t\tthis.first.prev = null;\n\t\t\t}\n\n\t\t\titem.next = null;\n\t\t}\n\n\t\treturn this;\n\t}\n\n\t/**\n\t * Returns the expiration timestamp for a given key.\n\t *\n\t * @method expiresAt\n\t * @memberof LRU\n\t * @param {string} key - The key to check expiration for.\n\t * @returns {number|undefined} The expiration timestamp in milliseconds, or undefined if key doesn't exist.\n\t * @example\n\t * const cache = new LRU(100, 5000); // 5 second TTL\n\t * cache.set('key1', 'value1');\n\t * console.log(cache.expiresAt('key1')); // timestamp 5 seconds from now\n\t * @see {@link LRU#get}\n\t * @see {@link LRU#has}\n\t * @since 1.0.0\n\t */\n\texpiresAt (key) {\n\t\tconst item = this.items[key];\n\t\treturn item !== undefined ? item.expiry : undefined;\n\t}\n\n\t/**\n\t * Retrieves a value from the cache by key. Updates the item's position to most recently used.\n\t *\n\t * @method get\n\t * @memberof LRU\n\t * @param {string} key - The key to retrieve.\n\t * @returns {*} The value associated with the key, or undefined if not found or expired.\n\t * @example\n\t * cache.set('key1', 'value1');\n\t * console.log(cache.get('key1')); // 'value1'\n\t * console.log(cache.get('nonexistent')); // undefined\n\t * @see {@link LRU#set}\n\t * @see {@link LRU#has}\n\t * @since 1.0.0\n\t */\n\tget (key) {\n\t\tconst item = this.items[key];\n\n\t\tif (item !== undefined) {\n\t\t\t// Check TTL only if enabled to avoid unnecessary Date.now() calls\n\t\t\tif (this.ttl > 0) {\n\t\t\t\tif (item.expiry <= Date.now()) {\n\t\t\t\t\tthis.delete(key);\n\n\t\t\t\t\treturn undefined;\n\t\t\t\t}\n\t\t\t}\n\n\t\t\t// Fast LRU update without full set() overhead\n\t\t\tthis.moveToEnd(item);\n\n\t\t\treturn item.value;\n\t\t}\n\n\t\treturn undefined;\n\t}\n\n\t/**\n\t * Checks if a key exists in the cache.\n\t *\n\t * @method has\n\t * @memberof LRU\n\t * @param {string} key - The key to check for.\n\t * @returns {boolean} True if the key exists, false otherwise.\n\t * @example\n\t * cache.set('key1', 'value1');\n\t * console.log(cache.has('key1')); // true\n\t * console.log(cache.has('nonexistent')); // false\n\t * @see {@link LRU#get}\n\t * @see {@link LRU#delete}\n\t * @since 9.0.0\n\t */\n\thas (key) {\n\t\tconst item = this.items[key];\n\t\treturn item !== undefined && (this.ttl === 0 || item.expiry > Date.now());\n\t}\n\n\t/**\n\t * Efficiently moves an item to the end of the LRU list (most recently used position).\n\t * This is an internal optimization method that avoids the overhead of the full set() operation\n\t * when only LRU position needs to be updated.\n\t *\n\t * @method moveToEnd\n\t * @memberof LRU\n\t * @param {Object} item - The cache item with prev/next pointers to reposition.\n\t * @private\n\t * @since 11.3.5\n\t */\n\tmoveToEnd (item) {\n\t\tif (this.last === item) {\n\t\t\treturn;\n\t\t}\n\n\t\tif (item.prev !== null) {\n\t\t\titem.prev.next = item.next;\n\t\t}\n\n\t\tif (item.next !== null) {\n\t\t\titem.next.prev = item.prev;\n\t\t}\n\n\t\tif (this.first === item) {\n\t\t\tthis.first = item.next;\n\t\t}\n\n\t\titem.prev = this.last;\n\t\titem.next = null;\n\t\tthis.last.next = item;\n\t\tthis.last = item;\n\t}\n\n\t/**\n\t * Returns an array of all keys in the cache, ordered from least to most recently used.\n\t *\n\t * @method keys\n\t * @memberof LRU\n\t * @returns {string[]} Array of keys in LRU order.\n\t * @example\n\t * cache.set('a', 1).set('b', 2);\n\t * cache.get('a'); // Move 'a' to most recent\n\t * console.log(cache.keys()); // ['b', 'a']\n\t * @see {@link LRU#values}\n\t * @see {@link LRU#entries}\n\t * @since 9.0.0\n\t */\n\tkeys () {\n\t\tconst result = Array.from({ length: this.size });\n\t\tlet x = this.first;\n\t\tlet i = 0;\n\n\t\twhile (x !== null) {\n\t\t\tresult[i++] = x.key;\n\t\t\tx = x.next;\n\t\t}\n\n\t\treturn result;\n\t}\n\n\t/**\n\t * Sets a value in the cache and returns any evicted item.\n\t *\n\t * @method setWithEvicted\n\t * @memberof LRU\n\t * @param {string} key - The key to set.\n\t * @param {*} value - The value to store.\n\t * @param {boolean} [resetTtl=this.resetTtl] - Whether to reset the TTL for this operation.\n\t * @returns {Object|null} The evicted item (if any) with shape {key, value, expiry, prev, next}, or null.\n\t * @example\n\t * const cache = new LRU(2);\n\t * cache.set('a', 1).set('b', 2);\n\t * const evicted = cache.setWithEvicted('c', 3); // evicted = {key: 'a', value: 1, ...}\n\t * @see {@link LRU#set}\n\t * @see {@link LRU#evict}\n\t * @since 11.3.0\n\t */\n\tsetWithEvicted (key, value, resetTtl = this.resetTtl) {\n\t\tlet evicted = null;\n\t\tlet item = this.items[key];\n\n\t\tif (item !== undefined) {\n\t\t\titem.value = value;\n\t\t\tif (resetTtl) {\n\t\t\t\titem.expiry = this.ttl > 0 ? Date.now() + this.ttl : this.ttl;\n\t\t\t}\n\t\t\tthis.moveToEnd(item);\n\t\t} else {\n\t\t\tif (this.max > 0 && this.size === this.max) {\n\t\t\t\tevicted = {\n\t\t\t\t\tkey: this.first.key,\n\t\t\t\t\tvalue: this.first.value,\n\t\t\t\t\texpiry: this.first.expiry\n\t\t\t\t};\n\t\t\t\tthis.evict(true);\n\t\t\t}\n\n\t\t\titem = this.items[key] = {\n\t\t\t\texpiry: this.ttl > 0 ? Date.now() + this.ttl : this.ttl,\n\t\t\t\tkey: key,\n\t\t\t\tprev: this.last,\n\t\t\t\tnext: null,\n\t\t\t\tvalue\n\t\t\t};\n\n\t\t\tif (++this.size === 1) {\n\t\t\t\tthis.first = item;\n\t\t\t} else {\n\t\t\t\tthis.last.next = item;\n\t\t\t}\n\n\t\t\tthis.last = item;\n\t\t}\n\n\t\treturn evicted;\n\t}\n\n\t/**\n\t * Sets a value in the cache. Updates the item's position to most recently used.\n\t *\n\t * @method set\n\t * @memberof LRU\n\t * @param {string} key - The key to set.\n\t * @param {*} value - The value to store.\n\t * @param {boolean} [bypass=false] - Internal parameter for setWithEvicted method.\n\t * @param {boolean} [resetTtl=this.resetTtl] - Whether to reset the TTL for this operation.\n\t * @returns {LRU} The LRU instance for method chaining.\n\t * @example\n\t * cache.set('key1', 'value1')\n\t * .set('key2', 'value2')\n\t * .set('key3', 'value3');\n\t * @see {@link LRU#get}\n\t * @see {@link LRU#setWithEvicted}\n\t * @since 1.0.0\n\t */\n\tset (key, value, bypass = false, resetTtl = this.resetTtl) {\n\t\tlet item = this.items[key];\n\n\t\tif (bypass || item !== undefined) {\n\t\t\t// Existing item: update value and position\n\t\t\titem.value = value;\n\n\t\t\tif (bypass === false && resetTtl) {\n\t\t\t\titem.expiry = this.ttl > 0 ? Date.now() + this.ttl : this.ttl;\n\t\t\t}\n\n\t\t\t// Always move to end, but the bypass parameter affects TTL reset behavior\n\t\t\tthis.moveToEnd(item);\n\t\t} else {\n\t\t\t// New item: check for eviction and create\n\t\t\tif (this.max > 0 && this.size === this.max) {\n\t\t\t\tthis.evict(true);\n\t\t\t}\n\n\t\t\titem = this.items[key] = {\n\t\t\t\texpiry: this.ttl > 0 ? Date.now() + this.ttl : this.ttl,\n\t\t\t\tkey: key,\n\t\t\t\tprev: this.last,\n\t\t\t\tnext: null,\n\t\t\t\tvalue\n\t\t\t};\n\n\t\t\tif (++this.size === 1) {\n\t\t\t\tthis.first = item;\n\t\t\t} else {\n\t\t\t\tthis.last.next = item;\n\t\t\t}\n\n\t\t\tthis.last = item;\n\t\t}\n\n\t\treturn this;\n\t}\n\n\t/**\n\t * Returns an array of all values in the cache for the specified keys.\n\t * Order follows LRU order (least to most recently used).\n\t *\n\t * @method values\n\t * @memberof LRU\n\t * @param {string[]} [keys=this.keys()] - Array of keys to get values for. Defaults to all keys.\n\t * @returns {Array<*>} Array of values corresponding to the keys in LRU order.\n\t * @example\n\t * cache.set('a', 1).set('b', 2);\n\t * console.log(cache.values()); // [1, 2]\n\t * console.log(cache.values(['a'])); // [1]\n\t * @see {@link LRU#keys}\n\t * @see {@link LRU#entries}\n\t * @since 11.1.0\n\t */\n\tvalues (keys) {\n\t\tif (keys === undefined) {\n\t\t\tkeys = this.keys();\n\t\t}\n\n\t\tconst result = Array.from({ length: keys.length });\n\t\tfor (let i = 0; i < keys.length; i++) {\n\t\t\tconst item = this.items[keys[i]];\n\t\t\tresult[i] = item !== undefined ? item.value : undefined;\n\t\t}\n\n\t\treturn result;\n\t}\n}\n\n/**\n * Factory function to create a new LRU cache instance with parameter validation.\n *\n * @function lru\n * @param {number} [max=1000] - Maximum number of items to store. Must be >= 0. Use 0 for unlimited size.\n * @param {number} [ttl=0] - Time to live in milliseconds. Must be >= 0. Use 0 for no expiration.\n * @param {boolean} [resetTtl=false] - Whether to reset TTL when accessing existing items via get().\n * @returns {LRU} A new LRU cache instance.\n * @throws {TypeError} When parameters are invalid (negative numbers or wrong types).\n * @example\n * // Create cache with factory function\n * const cache = lru(100, 5000, true);\n * cache.set('key', 'value');\n *\n * @example\n * // Error handling\n * try {\n * const cache = lru(-1); // Invalid max\n * } catch (error) {\n * console.error(error.message); // \"Invalid max value\"\n * }\n * @see {@link LRU}\n * @since 1.0.0\n */\nexport function lru (max = 1000, ttl = 0, resetTtl = false) {\n\tif (isNaN(max) || max < 0) {\n\t\tthrow new TypeError(\"Invalid max value\");\n\t}\n\n\tif (isNaN(ttl) || ttl < 0) {\n\t\tthrow new TypeError(\"Invalid ttl value\");\n\t}\n\n\tif (typeof resetTtl !== \"boolean\") {\n\t\tthrow new TypeError(\"Invalid resetTtl value\");\n\t}\n\n\treturn new LRU(max, ttl, 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\ No newline at end of file diff --git a/eslint.config.js b/eslint.config.js index 6de2781..ccd8eb4 100644 --- a/eslint.config.js +++ b/eslint.config.js @@ -2,175 +2,179 @@ import globals from "globals"; import pluginJs from "@eslint/js"; export default [ - { - languageOptions: { - globals: { - ...globals.node, - it: true, - describe: true, - beforeEach: true - }, - parserOptions: { - ecmaVersion: 2022 - } - }, - rules: { - "arrow-parens": [2, "as-needed"], - "arrow-spacing": [2, {"before": true, "after": true}], - "block-scoped-var": [0], - "brace-style": [2, "1tbs", {"allowSingleLine": true}], - "camelcase": [0], - "comma-dangle": [2, "never"], - "comma-spacing": [2], - "comma-style": [2, "last"], - "complexity": [0, 11], - "consistent-return": [2], - "consistent-this": [0, "that"], - "curly": [2, "multi-line"], - "default-case": [2], - "dot-notation": [2, {"allowKeywords": true}], - "eol-last": [2], - "eqeqeq": [2], - "func-names": [0], - "func-style": [0, "declaration"], - "generator-star-spacing": [2, "after"], - "guard-for-in": [0], - "handle-callback-err": [0], - "indent": ["error", "tab", {"VariableDeclarator": {"var": 1, "let": 1, "const": 1}, "SwitchCase": 1}], - "key-spacing": [2, {"beforeColon": false, "afterColon": true}], - "quotes": [2, "double", "avoid-escape"], - "max-depth": [0, 4], - "max-len": [0, 80, 4], - "max-nested-callbacks": [0, 2], - "max-params": [0, 3], - "max-statements": [0, 10], - "new-parens": [2], - "new-cap": [2, {"capIsNewExceptions": ["ToInteger", "ToObject", "ToPrimitive", "ToUint32"]}], - "newline-after-var": [0], - "newline-before-return": [2], - "no-alert": [2], - "no-array-constructor": [2], - "no-bitwise": [0], - "no-caller": [2], - "no-catch-shadow": [2], - "no-cond-assign": [2], - "no-console": [0], - "no-constant-condition": [1], - "no-continue": [2], - "no-control-regex": [2], - "no-debugger": [2], - "no-delete-var": [2], - "no-div-regex": [0], - "no-dupe-args": [2], - "no-dupe-keys": [2], - "no-duplicate-case": [2], - "no-else-return": [0], - "no-empty": [2], - "no-eq-null": [0], - "no-eval": [2], - "no-ex-assign": [2], - "no-extend-native": [1], - "no-extra-bind": [2], - "no-extra-boolean-cast": [2], - "no-extra-semi": [1], - "no-empty-character-class": [2], - "no-fallthrough": [2], - "no-floating-decimal": [2], - "no-func-assign": [2], - "no-implied-eval": [2], - "no-inline-comments": [0], - "no-inner-declarations": [2, "functions"], - "no-invalid-regexp": [2], - "no-irregular-whitespace": [2], - "no-iterator": [2], - "no-label-var": [2], - "no-labels": [2], - "no-lone-blocks": [2], - "no-lonely-if": [2], - "no-loop-func": [2], - "no-mixed-requires": [0, false], - "no-mixed-spaces-and-tabs": [2, false], - "no-multi-spaces": [2], - "no-multi-str": [2], - "no-multiple-empty-lines": [2, {"max": 2}], - "no-native-reassign": [0], - "no-negated-in-lhs": [2], - "no-nested-ternary": [0], - "no-new": [2], - "no-new-func": [0], - "no-new-object": [2], - "no-new-require": [0], - "no-new-wrappers": [2], - "no-obj-calls": [2], - "no-octal": [2], - "no-octal-escape": [2], - "no-param-reassign": [0], - "no-path-concat": [0], - "no-plusplus": [0], - "no-process-env": [0], - "no-process-exit": [0], - "no-proto": [2], - "no-redeclare": [2], - "no-regex-spaces": [2], - "no-reserved-keys": [0], - "no-reno-new-funced-modules": [0], - "no-return-assign": [2], - "no-script-url": [2], - "no-self-compare": [0], - "no-sequences": [2], - "no-shadow": [2], - "no-shadow-restricted-names": [2], - "no-spaced-func": [2], - "no-sparse-arrays": [2], - "no-sync": [0], - "no-ternary": [0], - "no-throw-literal": [2], - "no-trailing-spaces": [2], - "no-undef": [2], - "no-undef-init": [2], - "no-undefined": [0], - "no-underscore-dangle": [0], - "no-unreachable": [2], - "no-unused-expressions": [2], - "no-unused-vars": [2, {"vars": "all", "args": "after-used"}], - "no-use-before-define": [2], - "no-void": [0], - "no-warning-comments": [0, {"terms": ["todo", "fixme", "xxx"], "location": "start"}], - "no-with": [2], - "no-extra-parens": [2], - "one-var": [0], - "operator-assignment": [0, "always"], - "operator-linebreak": [2, "after"], - "padded-blocks": [0], - "quote-props": [0], - "radix": [0], - "semi": [2], - "semi-spacing": [2, {before: false, after: true}], - "sort-vars": [0], - "keyword-spacing": [2], - "space-before-function-paren": [2, {anonymous: "always", named: "always"}], - "space-before-blocks": [2, "always"], - "space-in-brackets": [0, "never", { - singleValue: true, - arraysInArrays: false, - arraysInObjects: false, - objectsInArrays: true, - objectsInObjects: true, - propertyName: false - }], - "space-in-parens": [2, "never"], - "space-infix-ops": [2], - "space-unary-ops": [2, {words: true, nonwords: false}], - "spaced-line-comment": [0, "always"], - strict: [0], - "use-isnan": [2], - "valid-jsdoc": [0], - "valid-typeof": [2], - "vars-on-top": [0], - "wrap-iife": [2], - "wrap-regex": [2], - yoda: [2, "never", {exceptRange: true}] - } - }, - pluginJs.configs.recommended + { + languageOptions: { + globals: { + ...globals.node, + it: true, + describe: true, + beforeEach: true, + }, + parserOptions: { + ecmaVersion: 2022, + }, + }, + rules: { + "arrow-parens": [2, "as-needed"], + "arrow-spacing": [2, { before: true, after: true }], + "block-scoped-var": [0], + "brace-style": [2, "1tbs", { allowSingleLine: true }], + camelcase: [0], + "comma-dangle": [2, "never"], + "comma-spacing": [2], + "comma-style": [2, "last"], + complexity: [0, 11], + "consistent-return": [2], + "consistent-this": [0, "that"], + curly: [2, "multi-line"], + "default-case": [2], + "dot-notation": [2, { allowKeywords: true }], + "eol-last": [2], + eqeqeq: [2], + "func-names": [0], + "func-style": [0, "declaration"], + "generator-star-spacing": [2, "after"], + "guard-for-in": [0], + "handle-callback-err": [0], + indent: ["error", "tab", { VariableDeclarator: { var: 1, let: 1, const: 1 }, SwitchCase: 1 }], + "key-spacing": [2, { beforeColon: false, afterColon: true }], + quotes: [2, "double", "avoid-escape"], + "max-depth": [0, 4], + "max-len": [0, 80, 4], + "max-nested-callbacks": [0, 2], + "max-params": [0, 3], + "max-statements": [0, 10], + "new-parens": [2], + "new-cap": [2, { capIsNewExceptions: ["ToInteger", "ToObject", "ToPrimitive", "ToUint32"] }], + "newline-after-var": [0], + "newline-before-return": [2], + "no-alert": [2], + "no-array-constructor": [2], + "no-bitwise": [0], + "no-caller": [2], + "no-catch-shadow": [2], + "no-cond-assign": [2], + "no-console": [0], + "no-constant-condition": [1], + "no-continue": [2], + "no-control-regex": [2], + "no-debugger": [2], + "no-delete-var": [2], + "no-div-regex": [0], + "no-dupe-args": [2], + "no-dupe-keys": [2], + "no-duplicate-case": [2], + "no-else-return": [0], + "no-empty": [2], + "no-eq-null": [0], + "no-eval": [2], + "no-ex-assign": [2], + "no-extend-native": [1], + "no-extra-bind": [2], + "no-extra-boolean-cast": [2], + "no-extra-semi": [1], + "no-empty-character-class": [2], + "no-fallthrough": [2], + "no-floating-decimal": [2], + "no-func-assign": [2], + "no-implied-eval": [2], + "no-inline-comments": [0], + "no-inner-declarations": [2, "functions"], + "no-invalid-regexp": [2], + "no-irregular-whitespace": [2], + "no-iterator": [2], + "no-label-var": [2], + "no-labels": [2], + "no-lone-blocks": [2], + "no-lonely-if": [2], + "no-loop-func": [2], + "no-mixed-requires": [0, false], + "no-mixed-spaces-and-tabs": [2, false], + "no-multi-spaces": [2], + "no-multi-str": [2], + "no-multiple-empty-lines": [2, { max: 2 }], + "no-native-reassign": [0], + "no-negated-in-lhs": [2], + "no-nested-ternary": [0], + "no-new": [2], + "no-new-func": [0], + "no-new-object": [2], + "no-new-require": [0], + "no-new-wrappers": [2], + "no-obj-calls": [2], + "no-octal": [2], + "no-octal-escape": [2], + "no-param-reassign": [0], + "no-path-concat": [0], + "no-plusplus": [0], + "no-process-env": [0], + "no-process-exit": [0], + "no-proto": [2], + "no-redeclare": [2], + "no-regex-spaces": [2], + "no-reserved-keys": [0], + "no-reno-new-funced-modules": [0], + "no-return-assign": [2], + "no-script-url": [2], + "no-self-compare": [0], + "no-sequences": [2], + "no-shadow": [2], + "no-shadow-restricted-names": [2], + "no-spaced-func": [2], + "no-sparse-arrays": [2], + "no-sync": [0], + "no-ternary": [0], + "no-throw-literal": [2], + "no-trailing-spaces": [2], + "no-undef": [2], + "no-undef-init": [2], + "no-undefined": [0], + "no-underscore-dangle": [0], + "no-unreachable": [2], + "no-unused-expressions": [2], + "no-unused-vars": [2, { vars: "all", args: "after-used" }], + "no-use-before-define": [2], + "no-void": [0], + "no-warning-comments": [0, { terms: ["todo", "fixme", "xxx"], location: "start" }], + "no-with": [2], + "no-extra-parens": [2], + "one-var": [0], + "operator-assignment": [0, "always"], + "operator-linebreak": [2, "after"], + "padded-blocks": [0], + "quote-props": [0], + radix: [0], + semi: [2], + "semi-spacing": [2, { before: false, after: true }], + "sort-vars": [0], + "keyword-spacing": [2], + "space-before-function-paren": [2, { anonymous: "always", named: "always" }], + "space-before-blocks": [2, "always"], + "space-in-brackets": [ + 0, + "never", + { + singleValue: true, + arraysInArrays: false, + arraysInObjects: false, + objectsInArrays: true, + objectsInObjects: true, + propertyName: false, + }, + ], + "space-in-parens": [2, "never"], + "space-infix-ops": [2], + "space-unary-ops": [2, { words: true, nonwords: false }], + "spaced-line-comment": [0, "always"], + strict: [0], + "use-isnan": [2], + "valid-jsdoc": [0], + "valid-typeof": [2], + "vars-on-top": [0], + "wrap-iife": [2], + "wrap-regex": [2], + yoda: [2, "never", { exceptRange: true }], + }, + }, + pluginJs.configs.recommended, ]; diff --git a/rollup.config.js b/rollup.config.js index 31caa38..ff5d0e9 100644 --- a/rollup.config.js +++ b/rollup.config.js @@ -14,41 +14,40 @@ const bannerShort = `/*! ${year} ${pkg.author} @version ${pkg.version} */`; -const defaultOutBase = {compact: true, banner: bannerLong, name: pkg.name}; -const cjOutBase = {...defaultOutBase, compact: false, format: "cjs", exports: "named"}; -const esmOutBase = {...defaultOutBase, format: "esm"}; -const umdOutBase = {...defaultOutBase, format: "umd"}; -const minOutBase = {banner: bannerShort, name: pkg.name, plugins: [terser()], sourcemap: true}; - +const defaultOutBase = { compact: true, banner: bannerLong, name: pkg.name }; +const cjOutBase = { ...defaultOutBase, compact: false, format: "cjs", exports: "named" }; +const esmOutBase = { ...defaultOutBase, format: "esm" }; +const umdOutBase = { ...defaultOutBase, format: "umd" }; +const minOutBase = { banner: bannerShort, name: pkg.name, plugins: [terser()], sourcemap: true }; export default [ - { - input: "./src/lru.js", - output: [ - { - ...cjOutBase, - file: `dist/${pkg.name}.cjs` - }, - { - ...esmOutBase, - file: `dist/${pkg.name}.js` - }, - { - ...esmOutBase, - ...minOutBase, - file: `dist/${pkg.name}.min.js` - }, - { - ...umdOutBase, - file: `dist/${pkg.name}.umd.js`, - name: "lru" - }, - { - ...umdOutBase, - ...minOutBase, - file: `dist/${pkg.name}.umd.min.js`, - name: "lru" - } - ] - } + { + input: "./src/lru.js", + output: [ + { + ...cjOutBase, + file: `dist/${pkg.name}.cjs`, + }, + { + ...esmOutBase, + file: `dist/${pkg.name}.js`, + }, + { + ...esmOutBase, + ...minOutBase, + file: `dist/${pkg.name}.min.js`, + }, + { + ...umdOutBase, + file: `dist/${pkg.name}.umd.js`, + name: "lru", + }, + { + ...umdOutBase, + ...minOutBase, + file: `dist/${pkg.name}.umd.min.js`, + name: "lru", + }, + ], + }, ]; diff --git a/src/lru.js b/src/lru.js index 3f136ac..0ee96de 100644 --- a/src/lru.js +++ b/src/lru.js @@ -17,443 +17,443 @@ * // After 5 seconds, key1 will be expired */ export class LRU { - /** - * Creates a new LRU cache instance. - * Note: Constructor does not validate parameters. Use lru() factory function for parameter validation. - * - * @constructor - * @param {number} [max=0] - Maximum number of items to store. 0 means unlimited. - * @param {number} [ttl=0] - Time to live in milliseconds. 0 means no expiration. - * @param {boolean} [resetTtl=false] - Whether to reset TTL when accessing existing items via get(). - * @example - * const cache = new LRU(1000, 60000, true); // 1000 items, 1 minute TTL, reset on access - * @see {@link lru} For parameter validation - * @since 1.0.0 - */ - constructor (max = 0, ttl = 0, resetTtl = false) { - this.first = null; - this.items = Object.create(null); - this.last = null; - this.max = max; - this.resetTtl = resetTtl; - this.size = 0; - this.ttl = ttl; - } - - /** - * Removes all items from the cache. - * - * @method clear - * @memberof LRU - * @returns {LRU} The LRU instance for method chaining. - * @example - * cache.clear(); - * console.log(cache.size); // 0 - * @since 1.0.0 - */ - clear () { - this.first = null; - this.items = Object.create(null); - this.last = null; - this.size = 0; - - return this; - } - - /** - * Removes an item from the cache by key. - * - * @method delete - * @memberof LRU - * @param {string} key - The key of the item to delete. - * @returns {LRU} The LRU instance for method chaining. - * @example - * cache.set('key1', 'value1'); - * cache.delete('key1'); - * console.log(cache.has('key1')); // false - * @see {@link LRU#has} - * @see {@link LRU#clear} - * @since 1.0.0 - */ - delete (key) { - const item = this.items[key]; - - if (item !== undefined) { - delete this.items[key]; - this.size--; - - if (item.prev !== null) { - item.prev.next = item.next; - } - - if (item.next !== null) { - item.next.prev = item.prev; - } - - if (this.first === item) { - this.first = item.next; - } - - if (this.last === item) { - this.last = item.prev; - } - - item.prev = null; - item.next = null; - } - - return this; - } - - /** - * Returns an array of [key, value] pairs for the specified keys. - * Order follows LRU order (least to most recently used). - * - * @method entries - * @memberof LRU - * @param {string[]} [keys=this.keys()] - Array of keys to get entries for. Defaults to all keys. - * @returns {Array>} Array of [key, value] pairs in LRU order. - * @example - * cache.set('a', 1).set('b', 2); - * console.log(cache.entries()); // [['a', 1], ['b', 2]] - * console.log(cache.entries(['a'])); // [['a', 1]] - * @see {@link LRU#keys} - * @see {@link LRU#values} - * @since 11.1.0 - */ - entries (keys) { - if (keys === undefined) { - keys = this.keys(); - } - - const result = Array.from({ length: keys.length }); - for (let i = 0; i < keys.length; i++) { - const key = keys[i]; - const item = this.items[key]; - result[i] = [key, item !== undefined ? item.value : undefined]; - } - - return result; - } - - /** - * Removes the least recently used item from the cache. - * - * @method evict - * @memberof LRU - * @param {boolean} [bypass=false] - Whether to force eviction even when cache is empty. - * @returns {LRU} The LRU instance for method chaining. - * @example - * cache.set('old', 'value').set('new', 'value'); - * cache.evict(); // Removes 'old' item - * @see {@link LRU#setWithEvicted} - * @since 1.0.0 - */ - evict (bypass = false) { - if (bypass || this.size > 0) { - const item = this.first; - - if (!item) { - return this; - } - - delete this.items[item.key]; - - if (--this.size === 0) { - this.first = null; - this.last = null; - } else { - this.first = item.next; - this.first.prev = null; - } - - item.next = null; - } - - return this; - } - - /** - * Returns the expiration timestamp for a given key. - * - * @method expiresAt - * @memberof LRU - * @param {string} key - The key to check expiration for. - * @returns {number|undefined} The expiration timestamp in milliseconds, or undefined if key doesn't exist. - * @example - * const cache = new LRU(100, 5000); // 5 second TTL - * cache.set('key1', 'value1'); - * console.log(cache.expiresAt('key1')); // timestamp 5 seconds from now - * @see {@link LRU#get} - * @see {@link LRU#has} - * @since 1.0.0 - */ - expiresAt (key) { - const item = this.items[key]; - return item !== undefined ? item.expiry : undefined; - } - - /** - * Retrieves a value from the cache by key. Updates the item's position to most recently used. - * - * @method get - * @memberof LRU - * @param {string} key - The key to retrieve. - * @returns {*} The value associated with the key, or undefined if not found or expired. - * @example - * cache.set('key1', 'value1'); - * console.log(cache.get('key1')); // 'value1' - * console.log(cache.get('nonexistent')); // undefined - * @see {@link LRU#set} - * @see {@link LRU#has} - * @since 1.0.0 - */ - get (key) { - const item = this.items[key]; - - if (item !== undefined) { - // Check TTL only if enabled to avoid unnecessary Date.now() calls - if (this.ttl > 0) { - if (item.expiry <= Date.now()) { - this.delete(key); - - return undefined; - } - } - - // Fast LRU update without full set() overhead - this.moveToEnd(item); - - return item.value; - } - - return undefined; - } - - /** - * Checks if a key exists in the cache. - * - * @method has - * @memberof LRU - * @param {string} key - The key to check for. - * @returns {boolean} True if the key exists, false otherwise. - * @example - * cache.set('key1', 'value1'); - * console.log(cache.has('key1')); // true - * console.log(cache.has('nonexistent')); // false - * @see {@link LRU#get} - * @see {@link LRU#delete} - * @since 9.0.0 - */ - has (key) { - const item = this.items[key]; - return item !== undefined && (this.ttl === 0 || item.expiry > Date.now()); - } - - /** - * Efficiently moves an item to the end of the LRU list (most recently used position). - * This is an internal optimization method that avoids the overhead of the full set() operation - * when only LRU position needs to be updated. - * - * @method moveToEnd - * @memberof LRU - * @param {Object} item - The cache item with prev/next pointers to reposition. - * @private - * @since 11.3.5 - */ - moveToEnd (item) { - if (this.last === item) { - return; - } - - if (item.prev !== null) { - item.prev.next = item.next; - } - - if (item.next !== null) { - item.next.prev = item.prev; - } - - if (this.first === item) { - this.first = item.next; - } - - item.prev = this.last; - item.next = null; - this.last.next = item; - this.last = item; - } - - /** - * Returns an array of all keys in the cache, ordered from least to most recently used. - * - * @method keys - * @memberof LRU - * @returns {string[]} Array of keys in LRU order. - * @example - * cache.set('a', 1).set('b', 2); - * cache.get('a'); // Move 'a' to most recent - * console.log(cache.keys()); // ['b', 'a'] - * @see {@link LRU#values} - * @see {@link LRU#entries} - * @since 9.0.0 - */ - keys () { - const result = Array.from({ length: this.size }); - let x = this.first; - let i = 0; - - while (x !== null) { - result[i++] = x.key; - x = x.next; - } - - return result; - } - - /** - * Sets a value in the cache and returns any evicted item. - * - * @method setWithEvicted - * @memberof LRU - * @param {string} key - The key to set. - * @param {*} value - The value to store. - * @param {boolean} [resetTtl=this.resetTtl] - Whether to reset the TTL for this operation. - * @returns {Object|null} The evicted item (if any) with shape {key, value, expiry, prev, next}, or null. - * @example - * const cache = new LRU(2); - * cache.set('a', 1).set('b', 2); - * const evicted = cache.setWithEvicted('c', 3); // evicted = {key: 'a', value: 1, ...} - * @see {@link LRU#set} - * @see {@link LRU#evict} - * @since 11.3.0 - */ - setWithEvicted (key, value, resetTtl = this.resetTtl) { - let evicted = null; - let item = this.items[key]; - - if (item !== undefined) { - item.value = value; - if (resetTtl) { - item.expiry = this.ttl > 0 ? Date.now() + this.ttl : this.ttl; - } - this.moveToEnd(item); - } else { - if (this.max > 0 && this.size === this.max) { - evicted = { - key: this.first.key, - value: this.first.value, - expiry: this.first.expiry - }; - this.evict(true); - } - - item = this.items[key] = { - expiry: this.ttl > 0 ? Date.now() + this.ttl : this.ttl, - key: key, - prev: this.last, - next: null, - value - }; - - if (++this.size === 1) { - this.first = item; - } else { - this.last.next = item; - } - - this.last = item; - } - - return evicted; - } - - /** - * Sets a value in the cache. Updates the item's position to most recently used. - * - * @method set - * @memberof LRU - * @param {string} key - The key to set. - * @param {*} value - The value to store. - * @param {boolean} [bypass=false] - Internal parameter for setWithEvicted method. - * @param {boolean} [resetTtl=this.resetTtl] - Whether to reset the TTL for this operation. - * @returns {LRU} The LRU instance for method chaining. - * @example - * cache.set('key1', 'value1') - * .set('key2', 'value2') - * .set('key3', 'value3'); - * @see {@link LRU#get} - * @see {@link LRU#setWithEvicted} - * @since 1.0.0 - */ - set (key, value, bypass = false, resetTtl = this.resetTtl) { - let item = this.items[key]; - - if (bypass || item !== undefined) { - // Existing item: update value and position - item.value = value; - - if (bypass === false && resetTtl) { - item.expiry = this.ttl > 0 ? Date.now() + this.ttl : this.ttl; - } - - // Always move to end, but the bypass parameter affects TTL reset behavior - this.moveToEnd(item); - } else { - // New item: check for eviction and create - if (this.max > 0 && this.size === this.max) { - this.evict(true); - } - - item = this.items[key] = { - expiry: this.ttl > 0 ? Date.now() + this.ttl : this.ttl, - key: key, - prev: this.last, - next: null, - value - }; - - if (++this.size === 1) { - this.first = item; - } else { - this.last.next = item; - } - - this.last = item; - } - - return this; - } - - /** - * Returns an array of all values in the cache for the specified keys. - * Order follows LRU order (least to most recently used). - * - * @method values - * @memberof LRU - * @param {string[]} [keys=this.keys()] - Array of keys to get values for. Defaults to all keys. - * @returns {Array<*>} Array of values corresponding to the keys in LRU order. - * @example - * cache.set('a', 1).set('b', 2); - * console.log(cache.values()); // [1, 2] - * console.log(cache.values(['a'])); // [1] - * @see {@link LRU#keys} - * @see {@link LRU#entries} - * @since 11.1.0 - */ - values (keys) { - if (keys === undefined) { - keys = this.keys(); - } - - const result = Array.from({ length: keys.length }); - for (let i = 0; i < keys.length; i++) { - const item = this.items[keys[i]]; - result[i] = item !== undefined ? item.value : undefined; - } - - return result; - } + /** + * Creates a new LRU cache instance. + * Note: Constructor does not validate parameters. Use lru() factory function for parameter validation. + * + * @constructor + * @param {number} [max=0] - Maximum number of items to store. 0 means unlimited. + * @param {number} [ttl=0] - Time to live in milliseconds. 0 means no expiration. + * @param {boolean} [resetTtl=false] - Whether to reset TTL when accessing existing items via get(). + * @example + * const cache = new LRU(1000, 60000, true); // 1000 items, 1 minute TTL, reset on access + * @see {@link lru} For parameter validation + * @since 1.0.0 + */ + constructor(max = 0, ttl = 0, resetTtl = false) { + this.first = null; + this.items = Object.create(null); + this.last = null; + this.max = max; + this.resetTtl = resetTtl; + this.size = 0; + this.ttl = ttl; + } + + /** + * Removes all items from the cache. + * + * @method clear + * @memberof LRU + * @returns {LRU} The LRU instance for method chaining. + * @example + * cache.clear(); + * console.log(cache.size); // 0 + * @since 1.0.0 + */ + clear() { + this.first = null; + this.items = Object.create(null); + this.last = null; + this.size = 0; + + return this; + } + + /** + * Removes an item from the cache by key. + * + * @method delete + * @memberof LRU + * @param {string} key - The key of the item to delete. + * @returns {LRU} The LRU instance for method chaining. + * @example + * cache.set('key1', 'value1'); + * cache.delete('key1'); + * console.log(cache.has('key1')); // false + * @see {@link LRU#has} + * @see {@link LRU#clear} + * @since 1.0.0 + */ + delete(key) { + const item = this.items[key]; + + if (item !== undefined) { + delete this.items[key]; + this.size--; + + if (item.prev !== null) { + item.prev.next = item.next; + } + + if (item.next !== null) { + item.next.prev = item.prev; + } + + if (this.first === item) { + this.first = item.next; + } + + if (this.last === item) { + this.last = item.prev; + } + + item.prev = null; + item.next = null; + } + + return this; + } + + /** + * Returns an array of [key, value] pairs for the specified keys. + * Order follows LRU order (least to most recently used). + * + * @method entries + * @memberof LRU + * @param {string[]} [keys=this.keys()] - Array of keys to get entries for. Defaults to all keys. + * @returns {Array>} Array of [key, value] pairs in LRU order. + * @example + * cache.set('a', 1).set('b', 2); + * console.log(cache.entries()); // [['a', 1], ['b', 2]] + * console.log(cache.entries(['a'])); // [['a', 1]] + * @see {@link LRU#keys} + * @see {@link LRU#values} + * @since 11.1.0 + */ + entries(keys) { + if (keys === undefined) { + keys = this.keys(); + } + + const result = Array.from({ length: keys.length }); + for (let i = 0; i < keys.length; i++) { + const key = keys[i]; + const item = this.items[key]; + result[i] = [key, item !== undefined ? item.value : undefined]; + } + + return result; + } + + /** + * Removes the least recently used item from the cache. + * + * @method evict + * @memberof LRU + * @param {boolean} [bypass=false] - Whether to force eviction even when cache is empty. + * @returns {LRU} The LRU instance for method chaining. + * @example + * cache.set('old', 'value').set('new', 'value'); + * cache.evict(); // Removes 'old' item + * @see {@link LRU#setWithEvicted} + * @since 1.0.0 + */ + evict(bypass = false) { + if (bypass || this.size > 0) { + const item = this.first; + + if (!item) { + return this; + } + + delete this.items[item.key]; + + if (--this.size === 0) { + this.first = null; + this.last = null; + } else { + this.first = item.next; + this.first.prev = null; + } + + item.next = null; + } + + return this; + } + + /** + * Returns the expiration timestamp for a given key. + * + * @method expiresAt + * @memberof LRU + * @param {string} key - The key to check expiration for. + * @returns {number|undefined} The expiration timestamp in milliseconds, or undefined if key doesn't exist. + * @example + * const cache = new LRU(100, 5000); // 5 second TTL + * cache.set('key1', 'value1'); + * console.log(cache.expiresAt('key1')); // timestamp 5 seconds from now + * @see {@link LRU#get} + * @see {@link LRU#has} + * @since 1.0.0 + */ + expiresAt(key) { + const item = this.items[key]; + return item !== undefined ? item.expiry : undefined; + } + + /** + * Retrieves a value from the cache by key. Updates the item's position to most recently used. + * + * @method get + * @memberof LRU + * @param {string} key - The key to retrieve. + * @returns {*} The value associated with the key, or undefined if not found or expired. + * @example + * cache.set('key1', 'value1'); + * console.log(cache.get('key1')); // 'value1' + * console.log(cache.get('nonexistent')); // undefined + * @see {@link LRU#set} + * @see {@link LRU#has} + * @since 1.0.0 + */ + get(key) { + const item = this.items[key]; + + if (item !== undefined) { + // Check TTL only if enabled to avoid unnecessary Date.now() calls + if (this.ttl > 0) { + if (item.expiry <= Date.now()) { + this.delete(key); + + return undefined; + } + } + + // Fast LRU update without full set() overhead + this.moveToEnd(item); + + return item.value; + } + + return undefined; + } + + /** + * Checks if a key exists in the cache. + * + * @method has + * @memberof LRU + * @param {string} key - The key to check for. + * @returns {boolean} True if the key exists, false otherwise. + * @example + * cache.set('key1', 'value1'); + * console.log(cache.has('key1')); // true + * console.log(cache.has('nonexistent')); // false + * @see {@link LRU#get} + * @see {@link LRU#delete} + * @since 9.0.0 + */ + has(key) { + const item = this.items[key]; + return item !== undefined && (this.ttl === 0 || item.expiry > Date.now()); + } + + /** + * Efficiently moves an item to the end of the LRU list (most recently used position). + * This is an internal optimization method that avoids the overhead of the full set() operation + * when only LRU position needs to be updated. + * + * @method moveToEnd + * @memberof LRU + * @param {Object} item - The cache item with prev/next pointers to reposition. + * @private + * @since 11.3.5 + */ + moveToEnd(item) { + if (this.last === item) { + return; + } + + if (item.prev !== null) { + item.prev.next = item.next; + } + + if (item.next !== null) { + item.next.prev = item.prev; + } + + if (this.first === item) { + this.first = item.next; + } + + item.prev = this.last; + item.next = null; + this.last.next = item; + this.last = item; + } + + /** + * Returns an array of all keys in the cache, ordered from least to most recently used. + * + * @method keys + * @memberof LRU + * @returns {string[]} Array of keys in LRU order. + * @example + * cache.set('a', 1).set('b', 2); + * cache.get('a'); // Move 'a' to most recent + * console.log(cache.keys()); // ['b', 'a'] + * @see {@link LRU#values} + * @see {@link LRU#entries} + * @since 9.0.0 + */ + keys() { + const result = Array.from({ length: this.size }); + let x = this.first; + let i = 0; + + while (x !== null) { + result[i++] = x.key; + x = x.next; + } + + return result; + } + + /** + * Sets a value in the cache and returns any evicted item. + * + * @method setWithEvicted + * @memberof LRU + * @param {string} key - The key to set. + * @param {*} value - The value to store. + * @param {boolean} [resetTtl=this.resetTtl] - Whether to reset the TTL for this operation. + * @returns {Object|null} The evicted item (if any) with shape {key, value, expiry, prev, next}, or null. + * @example + * const cache = new LRU(2); + * cache.set('a', 1).set('b', 2); + * const evicted = cache.setWithEvicted('c', 3); // evicted = {key: 'a', value: 1, ...} + * @see {@link LRU#set} + * @see {@link LRU#evict} + * @since 11.3.0 + */ + setWithEvicted(key, value, resetTtl = this.resetTtl) { + let evicted = null; + let item = this.items[key]; + + if (item !== undefined) { + item.value = value; + if (resetTtl) { + item.expiry = this.ttl > 0 ? Date.now() + this.ttl : this.ttl; + } + this.moveToEnd(item); + } else { + if (this.max > 0 && this.size === this.max) { + evicted = { + key: this.first.key, + value: this.first.value, + expiry: this.first.expiry, + }; + this.evict(true); + } + + item = this.items[key] = { + expiry: this.ttl > 0 ? Date.now() + this.ttl : this.ttl, + key: key, + prev: this.last, + next: null, + value, + }; + + if (++this.size === 1) { + this.first = item; + } else { + this.last.next = item; + } + + this.last = item; + } + + return evicted; + } + + /** + * Sets a value in the cache. Updates the item's position to most recently used. + * + * @method set + * @memberof LRU + * @param {string} key - The key to set. + * @param {*} value - The value to store. + * @param {boolean} [bypass=false] - Internal parameter for setWithEvicted method. + * @param {boolean} [resetTtl=this.resetTtl] - Whether to reset the TTL for this operation. + * @returns {LRU} The LRU instance for method chaining. + * @example + * cache.set('key1', 'value1') + * .set('key2', 'value2') + * .set('key3', 'value3'); + * @see {@link LRU#get} + * @see {@link LRU#setWithEvicted} + * @since 1.0.0 + */ + set(key, value, bypass = false, resetTtl = this.resetTtl) { + let item = this.items[key]; + + if (bypass || item !== undefined) { + // Existing item: update value and position + item.value = value; + + if (bypass === false && resetTtl) { + item.expiry = this.ttl > 0 ? Date.now() + this.ttl : this.ttl; + } + + // Always move to end, but the bypass parameter affects TTL reset behavior + this.moveToEnd(item); + } else { + // New item: check for eviction and create + if (this.max > 0 && this.size === this.max) { + this.evict(true); + } + + item = this.items[key] = { + expiry: this.ttl > 0 ? Date.now() + this.ttl : this.ttl, + key: key, + prev: this.last, + next: null, + value, + }; + + if (++this.size === 1) { + this.first = item; + } else { + this.last.next = item; + } + + this.last = item; + } + + return this; + } + + /** + * Returns an array of all values in the cache for the specified keys. + * Order follows LRU order (least to most recently used). + * + * @method values + * @memberof LRU + * @param {string[]} [keys=this.keys()] - Array of keys to get values for. Defaults to all keys. + * @returns {Array<*>} Array of values corresponding to the keys in LRU order. + * @example + * cache.set('a', 1).set('b', 2); + * console.log(cache.values()); // [1, 2] + * console.log(cache.values(['a'])); // [1] + * @see {@link LRU#keys} + * @see {@link LRU#entries} + * @since 11.1.0 + */ + values(keys) { + if (keys === undefined) { + keys = this.keys(); + } + + const result = Array.from({ length: keys.length }); + for (let i = 0; i < keys.length; i++) { + const item = this.items[keys[i]]; + result[i] = item !== undefined ? item.value : undefined; + } + + return result; + } } /** @@ -480,18 +480,18 @@ export class LRU { * @see {@link LRU} * @since 1.0.0 */ -export function lru (max = 1000, ttl = 0, resetTtl = false) { - if (isNaN(max) || max < 0) { - throw new TypeError("Invalid max value"); - } +export function lru(max = 1000, ttl = 0, resetTtl = false) { + if (isNaN(max) || max < 0) { + throw new TypeError("Invalid max value"); + } - if (isNaN(ttl) || ttl < 0) { - throw new TypeError("Invalid ttl value"); - } + if (isNaN(ttl) || ttl < 0) { + throw new TypeError("Invalid ttl value"); + } - if (typeof resetTtl !== "boolean") { - throw new TypeError("Invalid resetTtl value"); - } + if (typeof resetTtl !== "boolean") { + throw new TypeError("Invalid resetTtl value"); + } - return new LRU(max, ttl, resetTtl); + return new LRU(max, ttl, resetTtl); } diff --git a/tests/unit/lru.js b/tests/unit/lru.js index 2f4ffd4..ff34bd0 100644 --- a/tests/unit/lru.js +++ b/tests/unit/lru.js @@ -1,536 +1,536 @@ -import {LRU, lru} from "../../src/lru.js"; -import {describe, it, beforeEach} from "node:test"; +import { LRU, lru } from "../../src/lru.js"; +import { describe, it, beforeEach } from "node:test"; import assert from "node:assert"; describe("LRU Cache", function () { - describe("Constructor", function () { - it("should create an LRU instance with default parameters", function () { - const cache = new LRU(); - assert.equal(cache.max, 0); - assert.equal(cache.ttl, 0); - assert.equal(cache.resetTtl, false); - assert.equal(cache.size, 0); - assert.equal(cache.first, null); - assert.equal(cache.last, null); - assert.notEqual(cache.items, null); - assert.equal(typeof cache.items, "object"); - }); - - it("should create an LRU instance with custom parameters", function () { - const cache = new LRU(10, 5000, true); - assert.equal(cache.max, 10); - assert.equal(cache.ttl, 5000); - assert.equal(cache.resetTtl, true); - assert.equal(cache.size, 0); - }); - }); - - describe("lru factory function", function () { - it("should create an LRU instance with default parameters", function () { - const cache = lru(); - assert.equal(cache.max, 1000); - assert.equal(cache.ttl, 0); - assert.equal(cache.resetTtl, false); - }); - - it("should create an LRU instance with custom parameters", function () { - const cache = lru(50, 1000, true); - assert.equal(cache.max, 50); - assert.equal(cache.ttl, 1000); - assert.equal(cache.resetTtl, true); - }); - - it("should throw TypeError for invalid max value", function () { - assert.throws(() => lru("invalid"), TypeError, "Invalid max value"); - assert.throws(() => lru(-1), TypeError, "Invalid max value"); - assert.throws(() => lru(NaN), TypeError, "Invalid max value"); - }); - - it("should throw TypeError for invalid ttl value", function () { - assert.throws(() => lru(10, "invalid"), TypeError, "Invalid ttl value"); - assert.throws(() => lru(10, -1), TypeError, "Invalid ttl value"); - assert.throws(() => lru(10, NaN), TypeError, "Invalid ttl value"); - }); - - it("should throw TypeError for invalid resetTtl value", function () { - assert.throws(() => lru(10, 0, "invalid"), TypeError, "Invalid resetTtl value"); - assert.throws(() => lru(10, 0, 1), TypeError, "Invalid resetTtl value"); - }); - }); - - describe("Basic operations", function () { - let cache; - - beforeEach(function () { - cache = new LRU(3); - }); - - it("should set and get values", function () { - cache.set("key1", "value1"); - assert.equal(cache.get("key1"), "value1"); - assert.equal(cache.size, 1); - }); - - it("should return undefined for non-existent keys", function () { - assert.equal(cache.get("nonexistent"), undefined); - }); - - it("should check if key exists with has()", function () { - cache.set("key1", "value1"); - assert.equal(cache.has("key1"), true); - assert.equal(cache.has("nonexistent"), false); - }); - - it("should delete items", function () { - cache.set("key1", "value1"); - cache.set("key2", "value2"); - assert.equal(cache.size, 2); - - cache.delete("key1"); - assert.equal(cache.size, 1); - assert.equal(cache.has("key1"), false); - assert.equal(cache.get("key1"), undefined); - assert.equal(cache.get("key2"), "value2"); - }); - - it("should delete non-existent key gracefully", function () { - cache.set("key1", "value1"); - cache.delete("nonexistent"); - assert.equal(cache.size, 1); - assert.equal(cache.get("key1"), "value1"); - }); - - it("should clear all items", function () { - cache.set("key1", "value1"); - cache.set("key2", "value2"); - assert.equal(cache.size, 2); - - cache.clear(); - assert.equal(cache.size, 0); - assert.equal(cache.first, null); - assert.equal(cache.last, null); - assert.notEqual(cache.items, null); - assert.equal(typeof cache.items, "object"); - }); - - it("should support method chaining", function () { - const result = cache.set("key1", "value1").set("key2", "value2").clear(); - assert.equal(result, cache); - }); - }); - - describe("LRU eviction", function () { - let cache; - - beforeEach(function () { - cache = new LRU(3); - }); - - it("should evict least recently used item when max is reached", function () { - cache.set("key1", "value1"); - cache.set("key2", "value2"); - cache.set("key3", "value3"); - cache.set("key4", "value4"); - - assert.equal(cache.size, 3); - assert.equal(cache.has("key1"), false); - assert.equal(cache.has("key2"), true); - assert.equal(cache.has("key3"), true); - assert.equal(cache.has("key4"), true); - }); - - it("should update position when accessing existing item", function () { - cache.set("key1", "value1"); - cache.set("key2", "value2"); - cache.set("key3", "value3"); - - cache.get("key1"); - - cache.set("key4", "value4"); - - assert.equal(cache.has("key1"), true); - assert.equal(cache.has("key2"), false); - assert.equal(cache.has("key3"), true); - assert.equal(cache.has("key4"), true); - }); - - it("should maintain correct order in keys()", function () { - cache.set("key1", "value1"); - cache.set("key2", "value2"); - cache.set("key3", "value3"); - - let keys = cache.keys(); - assert.deepEqual(keys, ["key1", "key2", "key3"]); - - cache.get("key1"); - keys = cache.keys(); - assert.deepEqual(keys, ["key2", "key3", "key1"]); - }); - - it("should handle unlimited cache size (max = 0)", function () { - const unlimitedCache = new LRU(0); - for (let i = 0; i < 1000; i++) { - unlimitedCache.set(`key${i}`, `value${i}`); - } - assert.equal(unlimitedCache.size, 1000); - }); - }); - - describe("Eviction methods", function () { - let cache; - - beforeEach(function () { - cache = new LRU(3); - cache.set("key1", "value1"); - cache.set("key2", "value2"); - cache.set("key3", "value3"); - }); - - it("should evict first item with evict()", function () { - cache.evict(); - assert.equal(cache.size, 2); - assert.equal(cache.has("key1"), false); - assert.equal(cache.has("key2"), true); - assert.equal(cache.has("key3"), true); - }); - - it("should evict with bypass flag", function () { - cache.evict(true); - assert.equal(cache.size, 2); - }); - - it("should handle evict on empty cache", function () { - cache.clear(); - cache.evict(); - assert.equal(cache.size, 0); - }); - - it("should handle evict on single item cache", function () { - cache.clear(); - cache.set("only", "value"); - cache.evict(); - assert.equal(cache.size, 0); - assert.equal(cache.first, null); - assert.equal(cache.last, null); - }); - }); - - describe("setWithEvicted method", function () { - let cache; - - beforeEach(function () { - cache = new LRU(2); - }); - - it("should return null when no eviction occurs", function () { - const evicted = cache.setWithEvicted("key1", "value1"); - assert.equal(evicted, null); - }); - - it("should return evicted item when max is reached", function () { - cache.set("key1", "value1"); - cache.set("key2", "value2"); - - const evicted = cache.setWithEvicted("key3", "value3"); - assert.notEqual(evicted, null); - assert.equal(evicted.key, "key1"); - assert.equal(evicted.value, "value1"); - }); - - it("should update existing key without eviction", function () { - cache.set("key1", "value1"); - const evicted = cache.setWithEvicted("key1", "newvalue1"); - assert.equal(evicted, null); - assert.equal(cache.get("key1"), "newvalue1"); - }); - }); - - describe("Array methods", function () { - let cache; - - beforeEach(function () { - cache = new LRU(5); - cache.set("key1", "value1"); - cache.set("key2", "value2"); - cache.set("key3", "value3"); - }); - - it("should return all keys in LRU order", function () { - const keys = cache.keys(); - assert.deepEqual(keys, ["key1", "key2", "key3"]); - }); - - it("should return all values in LRU order", function () { - const values = cache.values(); - assert.deepEqual(values, ["value1", "value2", "value3"]); - }); - - it("should return values for specific keys", function () { - const values = cache.values(["key3", "key1"]); - assert.deepEqual(values, ["value3", "value1"]); - }); - - it("should return entries as [key, value] pairs", function () { - const entries = cache.entries(); - assert.deepEqual(entries, [ - ["key1", "value1"], - ["key2", "value2"], - ["key3", "value3"] - ]); - }); - - it("should return entries for specific keys", function () { - const entries = cache.entries(["key3", "key1"]); - assert.deepEqual(entries, [ - ["key3", "value3"], - ["key1", "value1"] - ]); - }); - - it("should handle empty cache", function () { - cache.clear(); - assert.deepEqual(cache.keys(), []); - assert.deepEqual(cache.values(), []); - assert.deepEqual(cache.entries(), []); - }); - }); - - describe("TTL (Time To Live)", function () { - let cache; - - beforeEach(function () { - cache = new LRU(5, 100); - }); - - it("should set expiration time", function () { - const beforeTime = Date.now(); - cache.set("key1", "value1"); - const expiresAt = cache.expiresAt("key1"); - - assert.ok(expiresAt >= beforeTime + 100); - assert.ok(expiresAt <= beforeTime + 200); - }); - - it("should return undefined for non-existent key expiration", function () { - assert.equal(cache.expiresAt("nonexistent"), undefined); - }); - - it("should expire items after TTL", async function () { - cache.set("key1", "value1"); - assert.equal(cache.get("key1"), "value1"); - - await new Promise((resolve) => setTimeout(resolve, 150)); - assert.equal(cache.get("key1"), undefined); - assert.equal(cache.has("key1"), false); - assert.equal(cache.size, 0); - }); - - it("should handle TTL = 0 (no expiration)", function () { - const neverExpireCache = new LRU(5, 0); - neverExpireCache.set("key1", "value1"); - assert.equal(neverExpireCache.expiresAt("key1"), 0); - }); - - it("should reset TTL when accessing with resetTtl=true", async function () { - const resetCache = new LRU(5, 1000, true); - resetCache.set("key1", "value1"); - - const firstExpiry = resetCache.expiresAt("key1"); - - await new Promise((resolve) => setTimeout(resolve, 10)); - resetCache.set("key1", "value1", false, true); - const secondExpiry = resetCache.expiresAt("key1"); - - assert.ok(secondExpiry > firstExpiry, "TTL should be reset"); - }); - - it("should not reset TTL when resetTtl=false", async function () { - const noResetCache = new LRU(5, 100, false); - noResetCache.set("key1", "value1"); - - await new Promise((resolve) => setTimeout(resolve, 50)); - assert.equal(noResetCache.get("key1"), "value1"); - - await new Promise((resolve) => setTimeout(resolve, 75)); - assert.equal(noResetCache.get("key1"), undefined); - }); - }); - - describe("Edge cases and complex scenarios", function () { - it("should handle updating existing key with set()", function () { - const cache = new LRU(3); - cache.set("key1", "value1"); - cache.set("key2", "value2"); - cache.set("key1", "newvalue1"); - - assert.equal(cache.get("key1"), "newvalue1"); - assert.equal(cache.size, 2); - }); - - it("should maintain correct first/last pointers during deletion", function () { - const cache = new LRU(3); - cache.set("key1", "value1"); - cache.set("key2", "value2"); - cache.set("key3", "value3"); - - cache.delete("key2"); - assert.deepEqual(cache.keys(), ["key1", "key3"]); - - cache.delete("key1"); - assert.deepEqual(cache.keys(), ["key3"]); - - cache.delete("key3"); - assert.deepEqual(cache.keys(), []); - assert.equal(cache.first, null); - assert.equal(cache.last, null); - }); - - it("should handle complex LRU repositioning", function () { - const cache = new LRU(4); - cache.set("a", 1); - cache.set("b", 2); - cache.set("c", 3); - cache.set("d", 4); - - cache.set("b", 22); - cache.get("a"); - cache.set("c", 33); - - assert.deepEqual(cache.keys(), ["d", "b", "a", "c"]); - }); - - it("should handle set with bypass parameter", function () { - const cache = new LRU(3); - cache.set("key1", "value1"); - cache.set("key2", "value2"); - - cache.set("key1", "newvalue1", true); - assert.deepEqual(cache.keys(), ["key2", "key1"]); - }); - - it("should handle resetTtl parameter in set method", function () { - const cache = new LRU(3, 1000, false); - const beforeTime = Date.now(); - cache.set("key1", "value1"); - - cache.set("key1", "newvalue1", false, true); - const expiresAt = cache.expiresAt("key1"); - assert.ok(expiresAt > beforeTime + 900); - }); - - it("should handle single item cache operations", function () { - const cache = new LRU(1); - - cache.set("key1", "value1"); - assert.equal(cache.first, cache.last); - assert.equal(cache.size, 1); - - cache.set("key2", "value2"); - assert.equal(cache.first, cache.last); - assert.equal(cache.size, 1); - assert.equal(cache.has("key1"), false); - assert.equal(cache.has("key2"), true); - }); - - it("should handle empty cache operations", function () { - const cache = new LRU(3); - - assert.equal(cache.get("key1"), undefined); - assert.equal(cache.has("key1"), false); - cache.delete("key1"); - assert.equal(cache.expiresAt("key1"), undefined); - - cache.evict(); - assert.equal(cache.size, 0); - }); - - it("should handle accessing items that become last", function () { - const cache = new LRU(3); - cache.set("key1", "value1"); - cache.set("key2", "value2"); - cache.set("key3", "value3"); - - cache.get("key3"); - assert.deepEqual(cache.keys(), ["key1", "key2", "key3"]); - }); - }); - - describe("Memory and performance", function () { - it("should handle large number of operations", function () { - const cache = new LRU(1000); - - for (let i = 0; i < 1000; i++) { - cache.set(`key${i}`, `value${i}`); - } - assert.equal(cache.size, 1000); - - for (let i = 0; i < 100; i++) { - const key = `key${Math.floor(Math.random() * 1000)}`; - cache.get(key); - } - - for (let i = 1000; i < 1100; i++) { - cache.set(`key${i}`, `value${i}`); - } - assert.equal(cache.size, 1000); - }); - - it("should handle alternating set/get operations", function () { - const cache = new LRU(10); - - for (let i = 0; i < 100; i++) { - cache.set(`key${i % 10}`, `value${i}`); - cache.get(`key${(i + 5) % 10}`); - } - - assert.equal(cache.size, 10); - }); - }); - - describe("Additional coverage tests", function () { - it("should handle setWithEvicted with unlimited cache size", function () { - const cache = new LRU(0); - const evicted = cache.setWithEvicted("key1", "value1"); - assert.equal(evicted, null); - assert.equal(cache.size, 1); - }); - - it("should handle setWithEvicted with first item insertion", function () { - const cache = new LRU(2); - cache.setWithEvicted("key1", "value1"); - assert.equal(cache.size, 1); - assert.equal(cache.first, cache.last); - }); - - it("should handle bypass parameter with resetTtl false", function () { - const cache = new LRU(3, 1000, false); - cache.set("key1", "value1"); - const originalExpiry = cache.expiresAt("key1"); - - cache.set("key1", "newvalue1", true, false); - const newExpiry = cache.expiresAt("key1"); - - assert.equal(originalExpiry, newExpiry); - }); - - it("should set expiry when using setWithEvicted with ttl > 0", function () { - const cache = new LRU(2, 100); - const before = Date.now(); - cache.set("a", 1); - cache.set("b", 2); - const evicted = cache.setWithEvicted("c", 3); - assert.notEqual(evicted, null); - const expiry = cache.expiresAt("c"); - assert.ok(expiry >= before + 100); - assert.ok(expiry <= before + 250); - }); - - it("should set expiry to 0 when resetTtl=true and ttl=0 on update", function () { - const cache = new LRU(2, 0); - cache.set("x", 1); - assert.equal(cache.expiresAt("x"), 0); - cache.set("x", 2, false, true); - assert.equal(cache.expiresAt("x"), 0); - }); - }); + describe("Constructor", function () { + it("should create an LRU instance with default parameters", function () { + const cache = new LRU(); + assert.equal(cache.max, 0); + assert.equal(cache.ttl, 0); + assert.equal(cache.resetTtl, false); + assert.equal(cache.size, 0); + assert.equal(cache.first, null); + assert.equal(cache.last, null); + assert.notEqual(cache.items, null); + assert.equal(typeof cache.items, "object"); + }); + + it("should create an LRU instance with custom parameters", function () { + const cache = new LRU(10, 5000, true); + assert.equal(cache.max, 10); + assert.equal(cache.ttl, 5000); + assert.equal(cache.resetTtl, true); + assert.equal(cache.size, 0); + }); + }); + + describe("lru factory function", function () { + it("should create an LRU instance with default parameters", function () { + const cache = lru(); + assert.equal(cache.max, 1000); + assert.equal(cache.ttl, 0); + assert.equal(cache.resetTtl, false); + }); + + it("should create an LRU instance with custom parameters", function () { + const cache = lru(50, 1000, true); + assert.equal(cache.max, 50); + assert.equal(cache.ttl, 1000); + assert.equal(cache.resetTtl, true); + }); + + it("should throw TypeError for invalid max value", function () { + assert.throws(() => lru("invalid"), TypeError, "Invalid max value"); + assert.throws(() => lru(-1), TypeError, "Invalid max value"); + assert.throws(() => lru(NaN), TypeError, "Invalid max value"); + }); + + it("should throw TypeError for invalid ttl value", function () { + assert.throws(() => lru(10, "invalid"), TypeError, "Invalid ttl value"); + assert.throws(() => lru(10, -1), TypeError, "Invalid ttl value"); + assert.throws(() => lru(10, NaN), TypeError, "Invalid ttl value"); + }); + + it("should throw TypeError for invalid resetTtl value", function () { + assert.throws(() => lru(10, 0, "invalid"), TypeError, "Invalid resetTtl value"); + assert.throws(() => lru(10, 0, 1), TypeError, "Invalid resetTtl value"); + }); + }); + + describe("Basic operations", function () { + let cache; + + beforeEach(function () { + cache = new LRU(3); + }); + + it("should set and get values", function () { + cache.set("key1", "value1"); + assert.equal(cache.get("key1"), "value1"); + assert.equal(cache.size, 1); + }); + + it("should return undefined for non-existent keys", function () { + assert.equal(cache.get("nonexistent"), undefined); + }); + + it("should check if key exists with has()", function () { + cache.set("key1", "value1"); + assert.equal(cache.has("key1"), true); + assert.equal(cache.has("nonexistent"), false); + }); + + it("should delete items", function () { + cache.set("key1", "value1"); + cache.set("key2", "value2"); + assert.equal(cache.size, 2); + + cache.delete("key1"); + assert.equal(cache.size, 1); + assert.equal(cache.has("key1"), false); + assert.equal(cache.get("key1"), undefined); + assert.equal(cache.get("key2"), "value2"); + }); + + it("should delete non-existent key gracefully", function () { + cache.set("key1", "value1"); + cache.delete("nonexistent"); + assert.equal(cache.size, 1); + assert.equal(cache.get("key1"), "value1"); + }); + + it("should clear all items", function () { + cache.set("key1", "value1"); + cache.set("key2", "value2"); + assert.equal(cache.size, 2); + + cache.clear(); + assert.equal(cache.size, 0); + assert.equal(cache.first, null); + assert.equal(cache.last, null); + assert.notEqual(cache.items, null); + assert.equal(typeof cache.items, "object"); + }); + + it("should support method chaining", function () { + const result = cache.set("key1", "value1").set("key2", "value2").clear(); + assert.equal(result, cache); + }); + }); + + describe("LRU eviction", function () { + let cache; + + beforeEach(function () { + cache = new LRU(3); + }); + + it("should evict least recently used item when max is reached", function () { + cache.set("key1", "value1"); + cache.set("key2", "value2"); + cache.set("key3", "value3"); + cache.set("key4", "value4"); + + assert.equal(cache.size, 3); + assert.equal(cache.has("key1"), false); + assert.equal(cache.has("key2"), true); + assert.equal(cache.has("key3"), true); + assert.equal(cache.has("key4"), true); + }); + + it("should update position when accessing existing item", function () { + cache.set("key1", "value1"); + cache.set("key2", "value2"); + cache.set("key3", "value3"); + + cache.get("key1"); + + cache.set("key4", "value4"); + + assert.equal(cache.has("key1"), true); + assert.equal(cache.has("key2"), false); + assert.equal(cache.has("key3"), true); + assert.equal(cache.has("key4"), true); + }); + + it("should maintain correct order in keys()", function () { + cache.set("key1", "value1"); + cache.set("key2", "value2"); + cache.set("key3", "value3"); + + let keys = cache.keys(); + assert.deepEqual(keys, ["key1", "key2", "key3"]); + + cache.get("key1"); + keys = cache.keys(); + assert.deepEqual(keys, ["key2", "key3", "key1"]); + }); + + it("should handle unlimited cache size (max = 0)", function () { + const unlimitedCache = new LRU(0); + for (let i = 0; i < 1000; i++) { + unlimitedCache.set(`key${i}`, `value${i}`); + } + assert.equal(unlimitedCache.size, 1000); + }); + }); + + describe("Eviction methods", function () { + let cache; + + beforeEach(function () { + cache = new LRU(3); + cache.set("key1", "value1"); + cache.set("key2", "value2"); + cache.set("key3", "value3"); + }); + + it("should evict first item with evict()", function () { + cache.evict(); + assert.equal(cache.size, 2); + assert.equal(cache.has("key1"), false); + assert.equal(cache.has("key2"), true); + assert.equal(cache.has("key3"), true); + }); + + it("should evict with bypass flag", function () { + cache.evict(true); + assert.equal(cache.size, 2); + }); + + it("should handle evict on empty cache", function () { + cache.clear(); + cache.evict(); + assert.equal(cache.size, 0); + }); + + it("should handle evict on single item cache", function () { + cache.clear(); + cache.set("only", "value"); + cache.evict(); + assert.equal(cache.size, 0); + assert.equal(cache.first, null); + assert.equal(cache.last, null); + }); + }); + + describe("setWithEvicted method", function () { + let cache; + + beforeEach(function () { + cache = new LRU(2); + }); + + it("should return null when no eviction occurs", function () { + const evicted = cache.setWithEvicted("key1", "value1"); + assert.equal(evicted, null); + }); + + it("should return evicted item when max is reached", function () { + cache.set("key1", "value1"); + cache.set("key2", "value2"); + + const evicted = cache.setWithEvicted("key3", "value3"); + assert.notEqual(evicted, null); + assert.equal(evicted.key, "key1"); + assert.equal(evicted.value, "value1"); + }); + + it("should update existing key without eviction", function () { + cache.set("key1", "value1"); + const evicted = cache.setWithEvicted("key1", "newvalue1"); + assert.equal(evicted, null); + assert.equal(cache.get("key1"), "newvalue1"); + }); + }); + + describe("Array methods", function () { + let cache; + + beforeEach(function () { + cache = new LRU(5); + cache.set("key1", "value1"); + cache.set("key2", "value2"); + cache.set("key3", "value3"); + }); + + it("should return all keys in LRU order", function () { + const keys = cache.keys(); + assert.deepEqual(keys, ["key1", "key2", "key3"]); + }); + + it("should return all values in LRU order", function () { + const values = cache.values(); + assert.deepEqual(values, ["value1", "value2", "value3"]); + }); + + it("should return values for specific keys", function () { + const values = cache.values(["key3", "key1"]); + assert.deepEqual(values, ["value3", "value1"]); + }); + + it("should return entries as [key, value] pairs", function () { + const entries = cache.entries(); + assert.deepEqual(entries, [ + ["key1", "value1"], + ["key2", "value2"], + ["key3", "value3"], + ]); + }); + + it("should return entries for specific keys", function () { + const entries = cache.entries(["key3", "key1"]); + assert.deepEqual(entries, [ + ["key3", "value3"], + ["key1", "value1"], + ]); + }); + + it("should handle empty cache", function () { + cache.clear(); + assert.deepEqual(cache.keys(), []); + assert.deepEqual(cache.values(), []); + assert.deepEqual(cache.entries(), []); + }); + }); + + describe("TTL (Time To Live)", function () { + let cache; + + beforeEach(function () { + cache = new LRU(5, 100); + }); + + it("should set expiration time", function () { + const beforeTime = Date.now(); + cache.set("key1", "value1"); + const expiresAt = cache.expiresAt("key1"); + + assert.ok(expiresAt >= beforeTime + 100); + assert.ok(expiresAt <= beforeTime + 200); + }); + + it("should return undefined for non-existent key expiration", function () { + assert.equal(cache.expiresAt("nonexistent"), undefined); + }); + + it("should expire items after TTL", async function () { + cache.set("key1", "value1"); + assert.equal(cache.get("key1"), "value1"); + + await new Promise((resolve) => setTimeout(resolve, 150)); + assert.equal(cache.get("key1"), undefined); + assert.equal(cache.has("key1"), false); + assert.equal(cache.size, 0); + }); + + it("should handle TTL = 0 (no expiration)", function () { + const neverExpireCache = new LRU(5, 0); + neverExpireCache.set("key1", "value1"); + assert.equal(neverExpireCache.expiresAt("key1"), 0); + }); + + it("should reset TTL when accessing with resetTtl=true", async function () { + const resetCache = new LRU(5, 1000, true); + resetCache.set("key1", "value1"); + + const firstExpiry = resetCache.expiresAt("key1"); + + await new Promise((resolve) => setTimeout(resolve, 10)); + resetCache.set("key1", "value1", false, true); + const secondExpiry = resetCache.expiresAt("key1"); + + assert.ok(secondExpiry > firstExpiry, "TTL should be reset"); + }); + + it("should not reset TTL when resetTtl=false", async function () { + const noResetCache = new LRU(5, 100, false); + noResetCache.set("key1", "value1"); + + await new Promise((resolve) => setTimeout(resolve, 50)); + assert.equal(noResetCache.get("key1"), "value1"); + + await new Promise((resolve) => setTimeout(resolve, 75)); + assert.equal(noResetCache.get("key1"), undefined); + }); + }); + + describe("Edge cases and complex scenarios", function () { + it("should handle updating existing key with set()", function () { + const cache = new LRU(3); + cache.set("key1", "value1"); + cache.set("key2", "value2"); + cache.set("key1", "newvalue1"); + + assert.equal(cache.get("key1"), "newvalue1"); + assert.equal(cache.size, 2); + }); + + it("should maintain correct first/last pointers during deletion", function () { + const cache = new LRU(3); + cache.set("key1", "value1"); + cache.set("key2", "value2"); + cache.set("key3", "value3"); + + cache.delete("key2"); + assert.deepEqual(cache.keys(), ["key1", "key3"]); + + cache.delete("key1"); + assert.deepEqual(cache.keys(), ["key3"]); + + cache.delete("key3"); + assert.deepEqual(cache.keys(), []); + assert.equal(cache.first, null); + assert.equal(cache.last, null); + }); + + it("should handle complex LRU repositioning", function () { + const cache = new LRU(4); + cache.set("a", 1); + cache.set("b", 2); + cache.set("c", 3); + cache.set("d", 4); + + cache.set("b", 22); + cache.get("a"); + cache.set("c", 33); + + assert.deepEqual(cache.keys(), ["d", "b", "a", "c"]); + }); + + it("should handle set with bypass parameter", function () { + const cache = new LRU(3); + cache.set("key1", "value1"); + cache.set("key2", "value2"); + + cache.set("key1", "newvalue1", true); + assert.deepEqual(cache.keys(), ["key2", "key1"]); + }); + + it("should handle resetTtl parameter in set method", function () { + const cache = new LRU(3, 1000, false); + const beforeTime = Date.now(); + cache.set("key1", "value1"); + + cache.set("key1", "newvalue1", false, true); + const expiresAt = cache.expiresAt("key1"); + assert.ok(expiresAt > beforeTime + 900); + }); + + it("should handle single item cache operations", function () { + const cache = new LRU(1); + + cache.set("key1", "value1"); + assert.equal(cache.first, cache.last); + assert.equal(cache.size, 1); + + cache.set("key2", "value2"); + assert.equal(cache.first, cache.last); + assert.equal(cache.size, 1); + assert.equal(cache.has("key1"), false); + assert.equal(cache.has("key2"), true); + }); + + it("should handle empty cache operations", function () { + const cache = new LRU(3); + + assert.equal(cache.get("key1"), undefined); + assert.equal(cache.has("key1"), false); + cache.delete("key1"); + assert.equal(cache.expiresAt("key1"), undefined); + + cache.evict(); + assert.equal(cache.size, 0); + }); + + it("should handle accessing items that become last", function () { + const cache = new LRU(3); + cache.set("key1", "value1"); + cache.set("key2", "value2"); + cache.set("key3", "value3"); + + cache.get("key3"); + assert.deepEqual(cache.keys(), ["key1", "key2", "key3"]); + }); + }); + + describe("Memory and performance", function () { + it("should handle large number of operations", function () { + const cache = new LRU(1000); + + for (let i = 0; i < 1000; i++) { + cache.set(`key${i}`, `value${i}`); + } + assert.equal(cache.size, 1000); + + for (let i = 0; i < 100; i++) { + const key = `key${Math.floor(Math.random() * 1000)}`; + cache.get(key); + } + + for (let i = 1000; i < 1100; i++) { + cache.set(`key${i}`, `value${i}`); + } + assert.equal(cache.size, 1000); + }); + + it("should handle alternating set/get operations", function () { + const cache = new LRU(10); + + for (let i = 0; i < 100; i++) { + cache.set(`key${i % 10}`, `value${i}`); + cache.get(`key${(i + 5) % 10}`); + } + + assert.equal(cache.size, 10); + }); + }); + + describe("Additional coverage tests", function () { + it("should handle setWithEvicted with unlimited cache size", function () { + const cache = new LRU(0); + const evicted = cache.setWithEvicted("key1", "value1"); + assert.equal(evicted, null); + assert.equal(cache.size, 1); + }); + + it("should handle setWithEvicted with first item insertion", function () { + const cache = new LRU(2); + cache.setWithEvicted("key1", "value1"); + assert.equal(cache.size, 1); + assert.equal(cache.first, cache.last); + }); + + it("should handle bypass parameter with resetTtl false", function () { + const cache = new LRU(3, 1000, false); + cache.set("key1", "value1"); + const originalExpiry = cache.expiresAt("key1"); + + cache.set("key1", "newvalue1", true, false); + const newExpiry = cache.expiresAt("key1"); + + assert.equal(originalExpiry, newExpiry); + }); + + it("should set expiry when using setWithEvicted with ttl > 0", function () { + const cache = new LRU(2, 100); + const before = Date.now(); + cache.set("a", 1); + cache.set("b", 2); + const evicted = cache.setWithEvicted("c", 3); + assert.notEqual(evicted, null); + const expiry = cache.expiresAt("c"); + assert.ok(expiry >= before + 100); + assert.ok(expiry <= before + 250); + }); + + it("should set expiry to 0 when resetTtl=true and ttl=0 on update", function () { + const cache = new LRU(2, 0); + cache.set("x", 1); + assert.equal(cache.expiresAt("x"), 0); + cache.set("x", 2, false, true); + assert.equal(cache.expiresAt("x"), 0); + }); + }); }); From 87d89fe4fdf3b3def03bb4eac5e110b0b6473090 Mon Sep 17 00:00:00 2001 From: Jason Mulligan Date: Fri, 20 Mar 2026 20:56:35 -0400 Subject: [PATCH 22/28] Add coverage script and rename test file --- package.json | 1 + tests/unit/lru.test.js | 536 +++++++++++++++++++++++++++++++++++++++++ 2 files changed, 537 insertions(+) create mode 100644 tests/unit/lru.test.js diff --git a/package.json b/package.json index a9df343..383207f 100644 --- a/package.json +++ b/package.json @@ -40,6 +40,7 @@ "changelog": "auto-changelog -p", "fix": "oxlint --fix *.js benchmarks src tests/unit && oxfmt *.js benchmarks src tests/unit --write", "lint": "oxlint *.js benchmarks src tests/unit && oxfmt *.js benchmarks/*.js src/*.js tests/unit/*.js --check", + "coverage": "node --test --experimental-test-coverage --test-coverage-exclude=dist/** --test-coverage-exclude=tests/** --test-reporter=spec tests/**/*.test.js 2>&1 | grep -A 1000 \"start of coverage report\" > coverage.txt", "rollup": "rollup --config", "test": "npm run lint && node --test tests/**/*.js", "prepare": "husky" diff --git a/tests/unit/lru.test.js b/tests/unit/lru.test.js new file mode 100644 index 0000000..ff34bd0 --- /dev/null +++ b/tests/unit/lru.test.js @@ -0,0 +1,536 @@ +import { LRU, lru } from "../../src/lru.js"; +import { describe, it, beforeEach } from "node:test"; +import assert from "node:assert"; + +describe("LRU Cache", function () { + describe("Constructor", function () { + it("should create an LRU instance with default parameters", function () { + const cache = new LRU(); + assert.equal(cache.max, 0); + assert.equal(cache.ttl, 0); + assert.equal(cache.resetTtl, false); + assert.equal(cache.size, 0); + assert.equal(cache.first, null); + assert.equal(cache.last, null); + assert.notEqual(cache.items, null); + assert.equal(typeof cache.items, "object"); + }); + + it("should create an LRU instance with custom parameters", function () { + const cache = new LRU(10, 5000, true); + assert.equal(cache.max, 10); + assert.equal(cache.ttl, 5000); + assert.equal(cache.resetTtl, true); + assert.equal(cache.size, 0); + }); + }); + + describe("lru factory function", function () { + it("should create an LRU instance with default parameters", function () { + const cache = lru(); + assert.equal(cache.max, 1000); + assert.equal(cache.ttl, 0); + assert.equal(cache.resetTtl, false); + }); + + it("should create an LRU instance with custom parameters", function () { + const cache = lru(50, 1000, true); + assert.equal(cache.max, 50); + assert.equal(cache.ttl, 1000); + assert.equal(cache.resetTtl, true); + }); + + it("should throw TypeError for invalid max value", function () { + assert.throws(() => lru("invalid"), TypeError, "Invalid max value"); + assert.throws(() => lru(-1), TypeError, "Invalid max value"); + assert.throws(() => lru(NaN), TypeError, "Invalid max value"); + }); + + it("should throw TypeError for invalid ttl value", function () { + assert.throws(() => lru(10, "invalid"), TypeError, "Invalid ttl value"); + assert.throws(() => lru(10, -1), TypeError, "Invalid ttl value"); + assert.throws(() => lru(10, NaN), TypeError, "Invalid ttl value"); + }); + + it("should throw TypeError for invalid resetTtl value", function () { + assert.throws(() => lru(10, 0, "invalid"), TypeError, "Invalid resetTtl value"); + assert.throws(() => lru(10, 0, 1), TypeError, "Invalid resetTtl value"); + }); + }); + + describe("Basic operations", function () { + let cache; + + beforeEach(function () { + cache = new LRU(3); + }); + + it("should set and get values", function () { + cache.set("key1", "value1"); + assert.equal(cache.get("key1"), "value1"); + assert.equal(cache.size, 1); + }); + + it("should return undefined for non-existent keys", function () { + assert.equal(cache.get("nonexistent"), undefined); + }); + + it("should check if key exists with has()", function () { + cache.set("key1", "value1"); + assert.equal(cache.has("key1"), true); + assert.equal(cache.has("nonexistent"), false); + }); + + it("should delete items", function () { + cache.set("key1", "value1"); + cache.set("key2", "value2"); + assert.equal(cache.size, 2); + + cache.delete("key1"); + assert.equal(cache.size, 1); + assert.equal(cache.has("key1"), false); + assert.equal(cache.get("key1"), undefined); + assert.equal(cache.get("key2"), "value2"); + }); + + it("should delete non-existent key gracefully", function () { + cache.set("key1", "value1"); + cache.delete("nonexistent"); + assert.equal(cache.size, 1); + assert.equal(cache.get("key1"), "value1"); + }); + + it("should clear all items", function () { + cache.set("key1", "value1"); + cache.set("key2", "value2"); + assert.equal(cache.size, 2); + + cache.clear(); + assert.equal(cache.size, 0); + assert.equal(cache.first, null); + assert.equal(cache.last, null); + assert.notEqual(cache.items, null); + assert.equal(typeof cache.items, "object"); + }); + + it("should support method chaining", function () { + const result = cache.set("key1", "value1").set("key2", "value2").clear(); + assert.equal(result, cache); + }); + }); + + describe("LRU eviction", function () { + let cache; + + beforeEach(function () { + cache = new LRU(3); + }); + + it("should evict least recently used item when max is reached", function () { + cache.set("key1", "value1"); + cache.set("key2", "value2"); + cache.set("key3", "value3"); + cache.set("key4", "value4"); + + assert.equal(cache.size, 3); + assert.equal(cache.has("key1"), false); + assert.equal(cache.has("key2"), true); + assert.equal(cache.has("key3"), true); + assert.equal(cache.has("key4"), true); + }); + + it("should update position when accessing existing item", function () { + cache.set("key1", "value1"); + cache.set("key2", "value2"); + cache.set("key3", "value3"); + + cache.get("key1"); + + cache.set("key4", "value4"); + + assert.equal(cache.has("key1"), true); + assert.equal(cache.has("key2"), false); + assert.equal(cache.has("key3"), true); + assert.equal(cache.has("key4"), true); + }); + + it("should maintain correct order in keys()", function () { + cache.set("key1", "value1"); + cache.set("key2", "value2"); + cache.set("key3", "value3"); + + let keys = cache.keys(); + assert.deepEqual(keys, ["key1", "key2", "key3"]); + + cache.get("key1"); + keys = cache.keys(); + assert.deepEqual(keys, ["key2", "key3", "key1"]); + }); + + it("should handle unlimited cache size (max = 0)", function () { + const unlimitedCache = new LRU(0); + for (let i = 0; i < 1000; i++) { + unlimitedCache.set(`key${i}`, `value${i}`); + } + assert.equal(unlimitedCache.size, 1000); + }); + }); + + describe("Eviction methods", function () { + let cache; + + beforeEach(function () { + cache = new LRU(3); + cache.set("key1", "value1"); + cache.set("key2", "value2"); + cache.set("key3", "value3"); + }); + + it("should evict first item with evict()", function () { + cache.evict(); + assert.equal(cache.size, 2); + assert.equal(cache.has("key1"), false); + assert.equal(cache.has("key2"), true); + assert.equal(cache.has("key3"), true); + }); + + it("should evict with bypass flag", function () { + cache.evict(true); + assert.equal(cache.size, 2); + }); + + it("should handle evict on empty cache", function () { + cache.clear(); + cache.evict(); + assert.equal(cache.size, 0); + }); + + it("should handle evict on single item cache", function () { + cache.clear(); + cache.set("only", "value"); + cache.evict(); + assert.equal(cache.size, 0); + assert.equal(cache.first, null); + assert.equal(cache.last, null); + }); + }); + + describe("setWithEvicted method", function () { + let cache; + + beforeEach(function () { + cache = new LRU(2); + }); + + it("should return null when no eviction occurs", function () { + const evicted = cache.setWithEvicted("key1", "value1"); + assert.equal(evicted, null); + }); + + it("should return evicted item when max is reached", function () { + cache.set("key1", "value1"); + cache.set("key2", "value2"); + + const evicted = cache.setWithEvicted("key3", "value3"); + assert.notEqual(evicted, null); + assert.equal(evicted.key, "key1"); + assert.equal(evicted.value, "value1"); + }); + + it("should update existing key without eviction", function () { + cache.set("key1", "value1"); + const evicted = cache.setWithEvicted("key1", "newvalue1"); + assert.equal(evicted, null); + assert.equal(cache.get("key1"), "newvalue1"); + }); + }); + + describe("Array methods", function () { + let cache; + + beforeEach(function () { + cache = new LRU(5); + cache.set("key1", "value1"); + cache.set("key2", "value2"); + cache.set("key3", "value3"); + }); + + it("should return all keys in LRU order", function () { + const keys = cache.keys(); + assert.deepEqual(keys, ["key1", "key2", "key3"]); + }); + + it("should return all values in LRU order", function () { + const values = cache.values(); + assert.deepEqual(values, ["value1", "value2", "value3"]); + }); + + it("should return values for specific keys", function () { + const values = cache.values(["key3", "key1"]); + assert.deepEqual(values, ["value3", "value1"]); + }); + + it("should return entries as [key, value] pairs", function () { + const entries = cache.entries(); + assert.deepEqual(entries, [ + ["key1", "value1"], + ["key2", "value2"], + ["key3", "value3"], + ]); + }); + + it("should return entries for specific keys", function () { + const entries = cache.entries(["key3", "key1"]); + assert.deepEqual(entries, [ + ["key3", "value3"], + ["key1", "value1"], + ]); + }); + + it("should handle empty cache", function () { + cache.clear(); + assert.deepEqual(cache.keys(), []); + assert.deepEqual(cache.values(), []); + assert.deepEqual(cache.entries(), []); + }); + }); + + describe("TTL (Time To Live)", function () { + let cache; + + beforeEach(function () { + cache = new LRU(5, 100); + }); + + it("should set expiration time", function () { + const beforeTime = Date.now(); + cache.set("key1", "value1"); + const expiresAt = cache.expiresAt("key1"); + + assert.ok(expiresAt >= beforeTime + 100); + assert.ok(expiresAt <= beforeTime + 200); + }); + + it("should return undefined for non-existent key expiration", function () { + assert.equal(cache.expiresAt("nonexistent"), undefined); + }); + + it("should expire items after TTL", async function () { + cache.set("key1", "value1"); + assert.equal(cache.get("key1"), "value1"); + + await new Promise((resolve) => setTimeout(resolve, 150)); + assert.equal(cache.get("key1"), undefined); + assert.equal(cache.has("key1"), false); + assert.equal(cache.size, 0); + }); + + it("should handle TTL = 0 (no expiration)", function () { + const neverExpireCache = new LRU(5, 0); + neverExpireCache.set("key1", "value1"); + assert.equal(neverExpireCache.expiresAt("key1"), 0); + }); + + it("should reset TTL when accessing with resetTtl=true", async function () { + const resetCache = new LRU(5, 1000, true); + resetCache.set("key1", "value1"); + + const firstExpiry = resetCache.expiresAt("key1"); + + await new Promise((resolve) => setTimeout(resolve, 10)); + resetCache.set("key1", "value1", false, true); + const secondExpiry = resetCache.expiresAt("key1"); + + assert.ok(secondExpiry > firstExpiry, "TTL should be reset"); + }); + + it("should not reset TTL when resetTtl=false", async function () { + const noResetCache = new LRU(5, 100, false); + noResetCache.set("key1", "value1"); + + await new Promise((resolve) => setTimeout(resolve, 50)); + assert.equal(noResetCache.get("key1"), "value1"); + + await new Promise((resolve) => setTimeout(resolve, 75)); + assert.equal(noResetCache.get("key1"), undefined); + }); + }); + + describe("Edge cases and complex scenarios", function () { + it("should handle updating existing key with set()", function () { + const cache = new LRU(3); + cache.set("key1", "value1"); + cache.set("key2", "value2"); + cache.set("key1", "newvalue1"); + + assert.equal(cache.get("key1"), "newvalue1"); + assert.equal(cache.size, 2); + }); + + it("should maintain correct first/last pointers during deletion", function () { + const cache = new LRU(3); + cache.set("key1", "value1"); + cache.set("key2", "value2"); + cache.set("key3", "value3"); + + cache.delete("key2"); + assert.deepEqual(cache.keys(), ["key1", "key3"]); + + cache.delete("key1"); + assert.deepEqual(cache.keys(), ["key3"]); + + cache.delete("key3"); + assert.deepEqual(cache.keys(), []); + assert.equal(cache.first, null); + assert.equal(cache.last, null); + }); + + it("should handle complex LRU repositioning", function () { + const cache = new LRU(4); + cache.set("a", 1); + cache.set("b", 2); + cache.set("c", 3); + cache.set("d", 4); + + cache.set("b", 22); + cache.get("a"); + cache.set("c", 33); + + assert.deepEqual(cache.keys(), ["d", "b", "a", "c"]); + }); + + it("should handle set with bypass parameter", function () { + const cache = new LRU(3); + cache.set("key1", "value1"); + cache.set("key2", "value2"); + + cache.set("key1", "newvalue1", true); + assert.deepEqual(cache.keys(), ["key2", "key1"]); + }); + + it("should handle resetTtl parameter in set method", function () { + const cache = new LRU(3, 1000, false); + const beforeTime = Date.now(); + cache.set("key1", "value1"); + + cache.set("key1", "newvalue1", false, true); + const expiresAt = cache.expiresAt("key1"); + assert.ok(expiresAt > beforeTime + 900); + }); + + it("should handle single item cache operations", function () { + const cache = new LRU(1); + + cache.set("key1", "value1"); + assert.equal(cache.first, cache.last); + assert.equal(cache.size, 1); + + cache.set("key2", "value2"); + assert.equal(cache.first, cache.last); + assert.equal(cache.size, 1); + assert.equal(cache.has("key1"), false); + assert.equal(cache.has("key2"), true); + }); + + it("should handle empty cache operations", function () { + const cache = new LRU(3); + + assert.equal(cache.get("key1"), undefined); + assert.equal(cache.has("key1"), false); + cache.delete("key1"); + assert.equal(cache.expiresAt("key1"), undefined); + + cache.evict(); + assert.equal(cache.size, 0); + }); + + it("should handle accessing items that become last", function () { + const cache = new LRU(3); + cache.set("key1", "value1"); + cache.set("key2", "value2"); + cache.set("key3", "value3"); + + cache.get("key3"); + assert.deepEqual(cache.keys(), ["key1", "key2", "key3"]); + }); + }); + + describe("Memory and performance", function () { + it("should handle large number of operations", function () { + const cache = new LRU(1000); + + for (let i = 0; i < 1000; i++) { + cache.set(`key${i}`, `value${i}`); + } + assert.equal(cache.size, 1000); + + for (let i = 0; i < 100; i++) { + const key = `key${Math.floor(Math.random() * 1000)}`; + cache.get(key); + } + + for (let i = 1000; i < 1100; i++) { + cache.set(`key${i}`, `value${i}`); + } + assert.equal(cache.size, 1000); + }); + + it("should handle alternating set/get operations", function () { + const cache = new LRU(10); + + for (let i = 0; i < 100; i++) { + cache.set(`key${i % 10}`, `value${i}`); + cache.get(`key${(i + 5) % 10}`); + } + + assert.equal(cache.size, 10); + }); + }); + + describe("Additional coverage tests", function () { + it("should handle setWithEvicted with unlimited cache size", function () { + const cache = new LRU(0); + const evicted = cache.setWithEvicted("key1", "value1"); + assert.equal(evicted, null); + assert.equal(cache.size, 1); + }); + + it("should handle setWithEvicted with first item insertion", function () { + const cache = new LRU(2); + cache.setWithEvicted("key1", "value1"); + assert.equal(cache.size, 1); + assert.equal(cache.first, cache.last); + }); + + it("should handle bypass parameter with resetTtl false", function () { + const cache = new LRU(3, 1000, false); + cache.set("key1", "value1"); + const originalExpiry = cache.expiresAt("key1"); + + cache.set("key1", "newvalue1", true, false); + const newExpiry = cache.expiresAt("key1"); + + assert.equal(originalExpiry, newExpiry); + }); + + it("should set expiry when using setWithEvicted with ttl > 0", function () { + const cache = new LRU(2, 100); + const before = Date.now(); + cache.set("a", 1); + cache.set("b", 2); + const evicted = cache.setWithEvicted("c", 3); + assert.notEqual(evicted, null); + const expiry = cache.expiresAt("c"); + assert.ok(expiry >= before + 100); + assert.ok(expiry <= before + 250); + }); + + it("should set expiry to 0 when resetTtl=true and ttl=0 on update", function () { + const cache = new LRU(2, 0); + cache.set("x", 1); + assert.equal(cache.expiresAt("x"), 0); + cache.set("x", 2, false, true); + assert.equal(cache.expiresAt("x"), 0); + }); + }); +}); From 96736a2d204b2631b97b88c61a1ba3a50b5c7336 Mon Sep 17 00:00:00 2001 From: Jason Mulligan Date: Fri, 20 Mar 2026 20:57:47 -0400 Subject: [PATCH 23/28] Add tests for 100% line coverage --- coverage.txt | 10 ++++++++++ tests/unit/lru.test.js | 16 ++++++++++++++++ 2 files changed, 26 insertions(+) create mode 100644 coverage.txt diff --git a/coverage.txt b/coverage.txt new file mode 100644 index 0000000..a965e38 --- /dev/null +++ b/coverage.txt @@ -0,0 +1,10 @@ +ℹ start of coverage report +ℹ ---------------------------------------------------------- +ℹ file | line % | branch % | funcs % | uncovered lines +ℹ ---------------------------------------------------------- +ℹ src | | | | +ℹ lru.js | 100.00 | 95.00 | 100.00 | +ℹ ---------------------------------------------------------- +ℹ all files | 100.00 | 95.00 | 100.00 | +ℹ ---------------------------------------------------------- +ℹ end of coverage report diff --git a/tests/unit/lru.test.js b/tests/unit/lru.test.js index ff34bd0..60c9de5 100644 --- a/tests/unit/lru.test.js +++ b/tests/unit/lru.test.js @@ -532,5 +532,21 @@ describe("LRU Cache", function () { cache.set("x", 2, false, true); assert.equal(cache.expiresAt("x"), 0); }); + + it("should handle evict with bypass on empty cache", function () { + const cache = new LRU(3); + cache.evict(true); + assert.equal(cache.size, 0); + assert.equal(cache.first, null); + assert.equal(cache.last, null); + }); + + it("should set expiry to 0 when resetTtl=true and ttl=0 on setWithEvicted", function () { + const cache = new LRU(2, 0); + cache.set("x", 1); + assert.equal(cache.expiresAt("x"), 0); + cache.setWithEvicted("x", 2, true); + assert.equal(cache.expiresAt("x"), 0); + }); }); }); From 1dad65b180132a92dfa0b03124c6addffa6ca486 Mon Sep 17 00:00:00 2001 From: Jason Mulligan Date: Fri, 20 Mar 2026 20:58:24 -0400 Subject: [PATCH 24/28] Add test coverage info to README --- README.md | 13 +++++++++++-- 1 file changed, 11 insertions(+), 2 deletions(-) diff --git a/README.md b/README.md index 2aec976..e3a1539 100644 --- a/README.md +++ b/README.md @@ -216,11 +216,20 @@ All core operations are O(1): ```bash npm install # Install dependencies npm test # Run lint and tests -npm run lint # Lint code -npm run fmt # Format code +npm run lint # Lint and check formatting +npm run fix # Fix lint and formatting issues npm run build # Build distribution files +npm run coverage # Generate test coverage report ``` +## Test Coverage + +| Metric | Coverage | +|--------|----------| +| Lines | 100% | +| Branches | 95% | +| Functions | 100% | + ## License BSD-3-Clause From e5f5109f9a874828cd4173d275234b31170a169b Mon Sep 17 00:00:00 2001 From: Jason Mulligan Date: Fri, 20 Mar 2026 20:59:42 -0400 Subject: [PATCH 25/28] Remove unused eslint config --- eslint.config.js | 180 ----------------------------------------------- 1 file changed, 180 deletions(-) delete mode 100644 eslint.config.js diff --git a/eslint.config.js b/eslint.config.js deleted file mode 100644 index ccd8eb4..0000000 --- a/eslint.config.js +++ /dev/null @@ -1,180 +0,0 @@ -import globals from "globals"; -import pluginJs from "@eslint/js"; - -export default [ - { - languageOptions: { - globals: { - ...globals.node, - it: true, - describe: true, - beforeEach: true, - }, - parserOptions: { - ecmaVersion: 2022, - }, - }, - rules: { - "arrow-parens": [2, "as-needed"], - "arrow-spacing": [2, { before: true, after: true }], - "block-scoped-var": [0], - "brace-style": [2, "1tbs", { allowSingleLine: true }], - camelcase: [0], - "comma-dangle": [2, "never"], - "comma-spacing": [2], - "comma-style": [2, "last"], - complexity: [0, 11], - "consistent-return": [2], - "consistent-this": [0, "that"], - curly: [2, "multi-line"], - "default-case": [2], - "dot-notation": [2, { allowKeywords: true }], - "eol-last": [2], - eqeqeq: [2], - "func-names": [0], - "func-style": [0, "declaration"], - "generator-star-spacing": [2, "after"], - "guard-for-in": [0], - "handle-callback-err": [0], - indent: ["error", "tab", { VariableDeclarator: { var: 1, let: 1, const: 1 }, SwitchCase: 1 }], - "key-spacing": [2, { beforeColon: false, afterColon: true }], - quotes: [2, "double", "avoid-escape"], - "max-depth": [0, 4], - "max-len": [0, 80, 4], - "max-nested-callbacks": [0, 2], - "max-params": [0, 3], - "max-statements": [0, 10], - "new-parens": [2], - "new-cap": [2, { capIsNewExceptions: ["ToInteger", "ToObject", "ToPrimitive", "ToUint32"] }], - "newline-after-var": [0], - "newline-before-return": [2], - "no-alert": [2], - "no-array-constructor": [2], - "no-bitwise": [0], - "no-caller": [2], - "no-catch-shadow": [2], - "no-cond-assign": [2], - "no-console": [0], - "no-constant-condition": [1], - "no-continue": [2], - "no-control-regex": [2], - "no-debugger": [2], - "no-delete-var": [2], - "no-div-regex": [0], - "no-dupe-args": [2], - "no-dupe-keys": [2], - "no-duplicate-case": [2], - "no-else-return": [0], - "no-empty": [2], - "no-eq-null": [0], - "no-eval": [2], - "no-ex-assign": [2], - "no-extend-native": [1], - "no-extra-bind": [2], - "no-extra-boolean-cast": [2], - "no-extra-semi": [1], - "no-empty-character-class": [2], - "no-fallthrough": [2], - "no-floating-decimal": [2], - "no-func-assign": [2], - "no-implied-eval": [2], - "no-inline-comments": [0], - "no-inner-declarations": [2, "functions"], - "no-invalid-regexp": [2], - "no-irregular-whitespace": [2], - "no-iterator": [2], - "no-label-var": [2], - "no-labels": [2], - "no-lone-blocks": [2], - "no-lonely-if": [2], - "no-loop-func": [2], - "no-mixed-requires": [0, false], - "no-mixed-spaces-and-tabs": [2, false], - "no-multi-spaces": [2], - "no-multi-str": [2], - "no-multiple-empty-lines": [2, { max: 2 }], - "no-native-reassign": [0], - "no-negated-in-lhs": [2], - "no-nested-ternary": [0], - "no-new": [2], - "no-new-func": [0], - "no-new-object": [2], - "no-new-require": [0], - "no-new-wrappers": [2], - "no-obj-calls": [2], - "no-octal": [2], - "no-octal-escape": [2], - "no-param-reassign": [0], - "no-path-concat": [0], - "no-plusplus": [0], - "no-process-env": [0], - "no-process-exit": [0], - "no-proto": [2], - "no-redeclare": [2], - "no-regex-spaces": [2], - "no-reserved-keys": [0], - "no-reno-new-funced-modules": [0], - "no-return-assign": [2], - "no-script-url": [2], - "no-self-compare": [0], - "no-sequences": [2], - "no-shadow": [2], - "no-shadow-restricted-names": [2], - "no-spaced-func": [2], - "no-sparse-arrays": [2], - "no-sync": [0], - "no-ternary": [0], - "no-throw-literal": [2], - "no-trailing-spaces": [2], - "no-undef": [2], - "no-undef-init": [2], - "no-undefined": [0], - "no-underscore-dangle": [0], - "no-unreachable": [2], - "no-unused-expressions": [2], - "no-unused-vars": [2, { vars: "all", args: "after-used" }], - "no-use-before-define": [2], - "no-void": [0], - "no-warning-comments": [0, { terms: ["todo", "fixme", "xxx"], location: "start" }], - "no-with": [2], - "no-extra-parens": [2], - "one-var": [0], - "operator-assignment": [0, "always"], - "operator-linebreak": [2, "after"], - "padded-blocks": [0], - "quote-props": [0], - radix: [0], - semi: [2], - "semi-spacing": [2, { before: false, after: true }], - "sort-vars": [0], - "keyword-spacing": [2], - "space-before-function-paren": [2, { anonymous: "always", named: "always" }], - "space-before-blocks": [2, "always"], - "space-in-brackets": [ - 0, - "never", - { - singleValue: true, - arraysInArrays: false, - arraysInObjects: false, - objectsInArrays: true, - objectsInObjects: true, - propertyName: false, - }, - ], - "space-in-parens": [2, "never"], - "space-infix-ops": [2], - "space-unary-ops": [2, { words: true, nonwords: false }], - "spaced-line-comment": [0, "always"], - strict: [0], - "use-isnan": [2], - "valid-jsdoc": [0], - "valid-typeof": [2], - "vars-on-top": [0], - "wrap-iife": [2], - "wrap-regex": [2], - yoda: [2, "never", { exceptRange: true }], - }, - }, - pluginJs.configs.recommended, -]; From f235aa9f01fe4dd39a36ab950afad8d8b0972fda Mon Sep 17 00:00:00 2001 From: Jason Mulligan Date: Fri, 20 Mar 2026 21:05:34 -0400 Subject: [PATCH 26/28] Fix Mathematical Foundation section to match implementation --- docs/TECHNICAL_DOCUMENTATION.md | 17 +++++++++++------ 1 file changed, 11 insertions(+), 6 deletions(-) diff --git a/docs/TECHNICAL_DOCUMENTATION.md b/docs/TECHNICAL_DOCUMENTATION.md index 02a67cb..2840241 100644 --- a/docs/TECHNICAL_DOCUMENTATION.md +++ b/docs/TECHNICAL_DOCUMENTATION.md @@ -186,17 +186,22 @@ last.next \leftarrow H[k] & \text{otherwise} #### Set With Evicted Operation: $setWithEvicted(k, v, resetTtl = resetTtl) \rightarrow \{key: K, value: V, expiry: \mathbb{N}_0\} \cup \{\bot\}$ $$\begin{align} setWithEvicted(k, v, resetTtl) &= \begin{cases} -set(k, v, true, resetTtl) \land \bot & \text{if } k \in H \\ +update(k, v, resetTtl) \land \bot & \text{if } k \in H \\ evicted \land create(k, v) & \text{if } k \notin H \land max > 0 \land size = max \\ \bot \land create(k, v) & \text{if } k \notin H \land (max = 0 \lor size < max) \end{cases} \\ +update(k, v, resetTtl) &= H[k].value \leftarrow v \land moveToEnd(H[k]) \\ +& \quad \land \begin{cases} +H[k].expiry \leftarrow t_{now} + ttl & \text{if } resetTtl = true \land ttl > 0 \\ +\text{no-op} & \text{otherwise} +\end{cases} \\ \text{where } evicted &= \begin{cases} \{key: this.first.key, value: this.first.value, expiry: this.first.expiry\} & \text{if } size > 0 \\ \bot & \text{otherwise} \end{cases} \end{align}$$ -**Note:** `setWithEvicted()` always calls `set()` with `bypass = true`, which means TTL is never reset during `setWithEvicted()` operations, regardless of the `resetTtl` parameter. +**Note:** Unlike `set()`, `setWithEvicted()` does not use a `bypass` parameter, so TTL is reset when `resetTtl = true`. **Time Complexity:** $O(1)$ amortized @@ -232,7 +237,7 @@ first \leftarrow null \land last \leftarrow null & \text{if } item.prev = null \ $$\begin{align} moveToEnd(item) &= \begin{cases} \text{no-op} & \text{if } item = last \\ -item.prev.next \leftarrow item.next \land item.next.prev \leftarrow item.prev \land first \leftarrow item.next \land item.prev \leftarrow last \land last.next \leftarrow item \land last \leftarrow item \land first \leftarrow item \lor first & \text{if } item \neq last +item.prev.next \leftarrow item.next \land item.next.prev \leftarrow item.prev \land first \leftarrow item.next \land item.prev \leftarrow last \land last.next \leftarrow item \land last \leftarrow item & \text{if } item \neq last \end{cases} \end{align}$$ @@ -265,7 +270,7 @@ delete(k) & \text{if } isExpired(k) \\ **TTL Reset Behavior:** - TTL is only reset during `set()` operations when `resetTtl = true` and `bypass = false` - `get()` operations never reset TTL, regardless of the `resetTtl` setting -- `setWithEvicted()` operations never reset TTL because they always call `set()` with `bypass = true` +- `setWithEvicted()` operations reset TTL when `resetTtl = true` (does not use bypass parameter) ### Space Complexity @@ -280,8 +285,8 @@ delete(k) & \text{if } isExpired(k) \\ 2. **List Consistency:** $first \neq null \iff last \neq null \iff size > 0$ 3. **Hash Consistency:** $|H| = size$ 4. **LRU Order:** Items in list are ordered from least to most recently used -5. **TTL Validity:** $(ttl = 0 \Rightarrow \forall k \in H: H[k].expiry = 0) \land (ttl > 0 \Rightarrow \forall k \in H: H[k].expiry > t_{now})$ -6. **TTL Reset Invariant:** TTL is only reset during `set()` operations when `bypass = false`, never during `get()` or `setWithEvicted()` operations +5. **TTL Validity:** $(ttl = 0 \Rightarrow \forall k \in H: H[k].expiry = 0) \land (ttl > 0 \Rightarrow \forall k \in H: H[k].expiry \geq t_{now})$ +6. **TTL Reset Invariant:** TTL is only reset during `set()` operations when `bypass = false`, and during `setWithEvicted()` operations when `resetTtl = true` ## TypeScript Support From b40d6b4543b0670dfa168dace6a5075e08b5e628 Mon Sep 17 00:00:00 2001 From: Jason Mulligan Date: Fri, 20 Mar 2026 21:13:28 -0400 Subject: [PATCH 27/28] Update TypeScript definitions to match implementation --- types/lru.d.ts | 58 ++++++++++++++++++++++++++++++-------------------- 1 file changed, 35 insertions(+), 23 deletions(-) diff --git a/types/lru.d.ts b/types/lru.d.ts index 3f83b9d..f401d7d 100644 --- a/types/lru.d.ts +++ b/types/lru.d.ts @@ -24,6 +24,18 @@ export interface LRUItem { value: T; } +/** + * Represents the evicted item returned by setWithEvicted(). + */ +export interface EvictedItem { + /** The key of the evicted item */ + key: any; + /** The value of the evicted item */ + value: T; + /** The expiration timestamp of the evicted item */ + expiry: number; +} + /** * High-performance Least Recently Used (LRU) cache with optional TTL support. * All core operations (get, set, delete) are O(1). @@ -37,7 +49,7 @@ export class LRU { * @param resetTtl Whether to reset TTL when accessing existing items via get() (default: false) */ constructor(max?: number, ttl?: number, resetTtl?: boolean); - + /** Pointer to the least recently used item (first to be evicted) */ readonly first: LRUItem | null; /** Hash map for O(1) key-based access to cache nodes */ @@ -52,86 +64,86 @@ export class LRU { readonly size: number; /** Time-to-live in milliseconds (0 = no expiration) */ readonly ttl: number; - + /** * Removes all items from the cache. * @returns The LRU instance for method chaining */ clear(): this; - + /** * Removes an item from the cache by key. * @param key The key of the item to delete * @returns The LRU instance for method chaining */ delete(key: any): this; - + /** * Returns an array of [key, value] pairs for the specified keys. * Order follows LRU order (least to most recently used). * @param keys Array of keys to get entries for (defaults to all keys) * @returns Array of [key, value] pairs in LRU order */ - entries(keys?: any[]): [any, T][]; - + entries(keys?: any[]): [any, T | undefined][]; + /** * Removes the least recently used item from the cache. - * @param bypass Whether to force eviction even when cache is empty + * @param bypass Whether to force eviction even when cache is empty (default: false) * @returns The LRU instance for method chaining */ evict(bypass?: boolean): this; - + /** * Returns the expiration timestamp for a given key. * @param key The key to check expiration for * @returns The expiration timestamp in milliseconds, or undefined if key doesn't exist */ expiresAt(key: any): number | undefined; - + /** * Retrieves a value from the cache by key. Updates the item's position to most recently used. * @param key The key to retrieve * @returns The value associated with the key, or undefined if not found or expired */ get(key: any): T | undefined; - + /** - * Checks if a key exists in the cache. + * Checks if a key exists in the cache (not expired). * @param key The key to check for - * @returns True if the key exists, false otherwise + * @returns True if the key exists and is not expired, false otherwise */ has(key: any): boolean; - + /** * Returns an array of all keys in the cache, ordered from least to most recently used. * @returns Array of keys in LRU order */ keys(): any[]; - + /** * Sets a value in the cache. Updates the item's position to most recently used. * @param key The key to set * @param value The value to store - * @param bypass Internal parameter for setWithEvicted method - * @param resetTtl Whether to reset the TTL for this operation + * @param bypass Internal parameter for setWithEvicted method (default: false) + * @param resetTtl Whether to reset the TTL for this operation (default: this.resetTtl) * @returns The LRU instance for method chaining */ set(key: any, value: T, bypass?: boolean, resetTtl?: boolean): this; - + /** * Sets a value in the cache and returns any evicted item. * @param key The key to set * @param value The value to store - * @param resetTtl Whether to reset the TTL for this operation - * @returns The evicted item (if any) or null + * @param resetTtl Whether to reset the TTL for this operation (default: this.resetTtl) + * @returns The evicted item (if any) with {key, value, expiry} or null */ - setWithEvicted(key: any, value: T, resetTtl?: boolean): LRUItem | null; - + setWithEvicted(key: any, value: T, resetTtl?: boolean): EvictedItem | null; + /** * Returns an array of all values in the cache for the specified keys. * Order follows LRU order (least to most recently used). * @param keys Array of keys to get values for (defaults to all keys) - * @returns Array of values corresponding to the keys in LRU order + * @returns Array of values corresponding to the keys (undefined for missing/expired keys) */ - values(keys?: any[]): T[]; + values(keys?: any[]): (T | undefined)[]; } From 458f41488bffdf837f923a2664583e76ddc35876 Mon Sep 17 00:00:00 2001 From: Jason Mulligan Date: Fri, 20 Mar 2026 21:14:32 -0400 Subject: [PATCH 28/28] Rebuild distribution files --- dist/tiny-lru.cjs | 896 +++++++++++++++++------------------ dist/tiny-lru.js | 896 +++++++++++++++++------------------ dist/tiny-lru.min.js.map | 2 +- dist/tiny-lru.umd.js | 896 +++++++++++++++++------------------ dist/tiny-lru.umd.min.js.map | 2 +- tests/unit/lru.js | 536 --------------------- 6 files changed, 1346 insertions(+), 1882 deletions(-) delete mode 100644 tests/unit/lru.js diff --git a/dist/tiny-lru.cjs b/dist/tiny-lru.cjs index 478edac..67d0824 100644 --- a/dist/tiny-lru.cjs +++ b/dist/tiny-lru.cjs @@ -26,443 +26,443 @@ * // After 5 seconds, key1 will be expired */ class LRU { - /** - * Creates a new LRU cache instance. - * Note: Constructor does not validate parameters. Use lru() factory function for parameter validation. - * - * @constructor - * @param {number} [max=0] - Maximum number of items to store. 0 means unlimited. - * @param {number} [ttl=0] - Time to live in milliseconds. 0 means no expiration. - * @param {boolean} [resetTtl=false] - Whether to reset TTL when accessing existing items via get(). - * @example - * const cache = new LRU(1000, 60000, true); // 1000 items, 1 minute TTL, reset on access - * @see {@link lru} For parameter validation - * @since 1.0.0 - */ - constructor (max = 0, ttl = 0, resetTtl = false) { - this.first = null; - this.items = Object.create(null); - this.last = null; - this.max = max; - this.resetTtl = resetTtl; - this.size = 0; - this.ttl = ttl; - } - - /** - * Removes all items from the cache. - * - * @method clear - * @memberof LRU - * @returns {LRU} The LRU instance for method chaining. - * @example - * cache.clear(); - * console.log(cache.size); // 0 - * @since 1.0.0 - */ - clear () { - this.first = null; - this.items = Object.create(null); - this.last = null; - this.size = 0; - - return this; - } - - /** - * Removes an item from the cache by key. - * - * @method delete - * @memberof LRU - * @param {string} key - The key of the item to delete. - * @returns {LRU} The LRU instance for method chaining. - * @example - * cache.set('key1', 'value1'); - * cache.delete('key1'); - * console.log(cache.has('key1')); // false - * @see {@link LRU#has} - * @see {@link LRU#clear} - * @since 1.0.0 - */ - delete (key) { - const item = this.items[key]; - - if (item !== undefined) { - delete this.items[key]; - this.size--; - - if (item.prev !== null) { - item.prev.next = item.next; - } - - if (item.next !== null) { - item.next.prev = item.prev; - } - - if (this.first === item) { - this.first = item.next; - } - - if (this.last === item) { - this.last = item.prev; - } - - item.prev = null; - item.next = null; - } - - return this; - } - - /** - * Returns an array of [key, value] pairs for the specified keys. - * Order follows LRU order (least to most recently used). - * - * @method entries - * @memberof LRU - * @param {string[]} [keys=this.keys()] - Array of keys to get entries for. Defaults to all keys. - * @returns {Array>} Array of [key, value] pairs in LRU order. - * @example - * cache.set('a', 1).set('b', 2); - * console.log(cache.entries()); // [['a', 1], ['b', 2]] - * console.log(cache.entries(['a'])); // [['a', 1]] - * @see {@link LRU#keys} - * @see {@link LRU#values} - * @since 11.1.0 - */ - entries (keys) { - if (keys === undefined) { - keys = this.keys(); - } - - const result = Array.from({ length: keys.length }); - for (let i = 0; i < keys.length; i++) { - const key = keys[i]; - const item = this.items[key]; - result[i] = [key, item !== undefined ? item.value : undefined]; - } - - return result; - } - - /** - * Removes the least recently used item from the cache. - * - * @method evict - * @memberof LRU - * @param {boolean} [bypass=false] - Whether to force eviction even when cache is empty. - * @returns {LRU} The LRU instance for method chaining. - * @example - * cache.set('old', 'value').set('new', 'value'); - * cache.evict(); // Removes 'old' item - * @see {@link LRU#setWithEvicted} - * @since 1.0.0 - */ - evict (bypass = false) { - if (bypass || this.size > 0) { - const item = this.first; - - if (!item) { - return this; - } - - delete this.items[item.key]; - - if (--this.size === 0) { - this.first = null; - this.last = null; - } else { - this.first = item.next; - this.first.prev = null; - } - - item.next = null; - } - - return this; - } - - /** - * Returns the expiration timestamp for a given key. - * - * @method expiresAt - * @memberof LRU - * @param {string} key - The key to check expiration for. - * @returns {number|undefined} The expiration timestamp in milliseconds, or undefined if key doesn't exist. - * @example - * const cache = new LRU(100, 5000); // 5 second TTL - * cache.set('key1', 'value1'); - * console.log(cache.expiresAt('key1')); // timestamp 5 seconds from now - * @see {@link LRU#get} - * @see {@link LRU#has} - * @since 1.0.0 - */ - expiresAt (key) { - const item = this.items[key]; - return item !== undefined ? item.expiry : undefined; - } - - /** - * Retrieves a value from the cache by key. Updates the item's position to most recently used. - * - * @method get - * @memberof LRU - * @param {string} key - The key to retrieve. - * @returns {*} The value associated with the key, or undefined if not found or expired. - * @example - * cache.set('key1', 'value1'); - * console.log(cache.get('key1')); // 'value1' - * console.log(cache.get('nonexistent')); // undefined - * @see {@link LRU#set} - * @see {@link LRU#has} - * @since 1.0.0 - */ - get (key) { - const item = this.items[key]; - - if (item !== undefined) { - // Check TTL only if enabled to avoid unnecessary Date.now() calls - if (this.ttl > 0) { - if (item.expiry <= Date.now()) { - this.delete(key); - - return undefined; - } - } - - // Fast LRU update without full set() overhead - this.moveToEnd(item); - - return item.value; - } - - return undefined; - } - - /** - * Checks if a key exists in the cache. - * - * @method has - * @memberof LRU - * @param {string} key - The key to check for. - * @returns {boolean} True if the key exists, false otherwise. - * @example - * cache.set('key1', 'value1'); - * console.log(cache.has('key1')); // true - * console.log(cache.has('nonexistent')); // false - * @see {@link LRU#get} - * @see {@link LRU#delete} - * @since 9.0.0 - */ - has (key) { - const item = this.items[key]; - return item !== undefined && (this.ttl === 0 || item.expiry > Date.now()); - } - - /** - * Efficiently moves an item to the end of the LRU list (most recently used position). - * This is an internal optimization method that avoids the overhead of the full set() operation - * when only LRU position needs to be updated. - * - * @method moveToEnd - * @memberof LRU - * @param {Object} item - The cache item with prev/next pointers to reposition. - * @private - * @since 11.3.5 - */ - moveToEnd (item) { - if (this.last === item) { - return; - } - - if (item.prev !== null) { - item.prev.next = item.next; - } - - if (item.next !== null) { - item.next.prev = item.prev; - } - - if (this.first === item) { - this.first = item.next; - } - - item.prev = this.last; - item.next = null; - this.last.next = item; - this.last = item; - } - - /** - * Returns an array of all keys in the cache, ordered from least to most recently used. - * - * @method keys - * @memberof LRU - * @returns {string[]} Array of keys in LRU order. - * @example - * cache.set('a', 1).set('b', 2); - * cache.get('a'); // Move 'a' to most recent - * console.log(cache.keys()); // ['b', 'a'] - * @see {@link LRU#values} - * @see {@link LRU#entries} - * @since 9.0.0 - */ - keys () { - const result = Array.from({ length: this.size }); - let x = this.first; - let i = 0; - - while (x !== null) { - result[i++] = x.key; - x = x.next; - } - - return result; - } - - /** - * Sets a value in the cache and returns any evicted item. - * - * @method setWithEvicted - * @memberof LRU - * @param {string} key - The key to set. - * @param {*} value - The value to store. - * @param {boolean} [resetTtl=this.resetTtl] - Whether to reset the TTL for this operation. - * @returns {Object|null} The evicted item (if any) with shape {key, value, expiry, prev, next}, or null. - * @example - * const cache = new LRU(2); - * cache.set('a', 1).set('b', 2); - * const evicted = cache.setWithEvicted('c', 3); // evicted = {key: 'a', value: 1, ...} - * @see {@link LRU#set} - * @see {@link LRU#evict} - * @since 11.3.0 - */ - setWithEvicted (key, value, resetTtl = this.resetTtl) { - let evicted = null; - let item = this.items[key]; - - if (item !== undefined) { - item.value = value; - if (resetTtl) { - item.expiry = this.ttl > 0 ? Date.now() + this.ttl : this.ttl; - } - this.moveToEnd(item); - } else { - if (this.max > 0 && this.size === this.max) { - evicted = { - key: this.first.key, - value: this.first.value, - expiry: this.first.expiry - }; - this.evict(true); - } - - item = this.items[key] = { - expiry: this.ttl > 0 ? Date.now() + this.ttl : this.ttl, - key: key, - prev: this.last, - next: null, - value - }; - - if (++this.size === 1) { - this.first = item; - } else { - this.last.next = item; - } - - this.last = item; - } - - return evicted; - } - - /** - * Sets a value in the cache. Updates the item's position to most recently used. - * - * @method set - * @memberof LRU - * @param {string} key - The key to set. - * @param {*} value - The value to store. - * @param {boolean} [bypass=false] - Internal parameter for setWithEvicted method. - * @param {boolean} [resetTtl=this.resetTtl] - Whether to reset the TTL for this operation. - * @returns {LRU} The LRU instance for method chaining. - * @example - * cache.set('key1', 'value1') - * .set('key2', 'value2') - * .set('key3', 'value3'); - * @see {@link LRU#get} - * @see {@link LRU#setWithEvicted} - * @since 1.0.0 - */ - set (key, value, bypass = false, resetTtl = this.resetTtl) { - let item = this.items[key]; - - if (bypass || item !== undefined) { - // Existing item: update value and position - item.value = value; - - if (bypass === false && resetTtl) { - item.expiry = this.ttl > 0 ? Date.now() + this.ttl : this.ttl; - } - - // Always move to end, but the bypass parameter affects TTL reset behavior - this.moveToEnd(item); - } else { - // New item: check for eviction and create - if (this.max > 0 && this.size === this.max) { - this.evict(true); - } - - item = this.items[key] = { - expiry: this.ttl > 0 ? Date.now() + this.ttl : this.ttl, - key: key, - prev: this.last, - next: null, - value - }; - - if (++this.size === 1) { - this.first = item; - } else { - this.last.next = item; - } - - this.last = item; - } - - return this; - } - - /** - * Returns an array of all values in the cache for the specified keys. - * Order follows LRU order (least to most recently used). - * - * @method values - * @memberof LRU - * @param {string[]} [keys=this.keys()] - Array of keys to get values for. Defaults to all keys. - * @returns {Array<*>} Array of values corresponding to the keys in LRU order. - * @example - * cache.set('a', 1).set('b', 2); - * console.log(cache.values()); // [1, 2] - * console.log(cache.values(['a'])); // [1] - * @see {@link LRU#keys} - * @see {@link LRU#entries} - * @since 11.1.0 - */ - values (keys) { - if (keys === undefined) { - keys = this.keys(); - } - - const result = Array.from({ length: keys.length }); - for (let i = 0; i < keys.length; i++) { - const item = this.items[keys[i]]; - result[i] = item !== undefined ? item.value : undefined; - } - - return result; - } + /** + * Creates a new LRU cache instance. + * Note: Constructor does not validate parameters. Use lru() factory function for parameter validation. + * + * @constructor + * @param {number} [max=0] - Maximum number of items to store. 0 means unlimited. + * @param {number} [ttl=0] - Time to live in milliseconds. 0 means no expiration. + * @param {boolean} [resetTtl=false] - Whether to reset TTL when accessing existing items via get(). + * @example + * const cache = new LRU(1000, 60000, true); // 1000 items, 1 minute TTL, reset on access + * @see {@link lru} For parameter validation + * @since 1.0.0 + */ + constructor(max = 0, ttl = 0, resetTtl = false) { + this.first = null; + this.items = Object.create(null); + this.last = null; + this.max = max; + this.resetTtl = resetTtl; + this.size = 0; + this.ttl = ttl; + } + + /** + * Removes all items from the cache. + * + * @method clear + * @memberof LRU + * @returns {LRU} The LRU instance for method chaining. + * @example + * cache.clear(); + * console.log(cache.size); // 0 + * @since 1.0.0 + */ + clear() { + this.first = null; + this.items = Object.create(null); + this.last = null; + this.size = 0; + + return this; + } + + /** + * Removes an item from the cache by key. + * + * @method delete + * @memberof LRU + * @param {string} key - The key of the item to delete. + * @returns {LRU} The LRU instance for method chaining. + * @example + * cache.set('key1', 'value1'); + * cache.delete('key1'); + * console.log(cache.has('key1')); // false + * @see {@link LRU#has} + * @see {@link LRU#clear} + * @since 1.0.0 + */ + delete(key) { + const item = this.items[key]; + + if (item !== undefined) { + delete this.items[key]; + this.size--; + + if (item.prev !== null) { + item.prev.next = item.next; + } + + if (item.next !== null) { + item.next.prev = item.prev; + } + + if (this.first === item) { + this.first = item.next; + } + + if (this.last === item) { + this.last = item.prev; + } + + item.prev = null; + item.next = null; + } + + return this; + } + + /** + * Returns an array of [key, value] pairs for the specified keys. + * Order follows LRU order (least to most recently used). + * + * @method entries + * @memberof LRU + * @param {string[]} [keys=this.keys()] - Array of keys to get entries for. Defaults to all keys. + * @returns {Array>} Array of [key, value] pairs in LRU order. + * @example + * cache.set('a', 1).set('b', 2); + * console.log(cache.entries()); // [['a', 1], ['b', 2]] + * console.log(cache.entries(['a'])); // [['a', 1]] + * @see {@link LRU#keys} + * @see {@link LRU#values} + * @since 11.1.0 + */ + entries(keys) { + if (keys === undefined) { + keys = this.keys(); + } + + const result = Array.from({ length: keys.length }); + for (let i = 0; i < keys.length; i++) { + const key = keys[i]; + const item = this.items[key]; + result[i] = [key, item !== undefined ? item.value : undefined]; + } + + return result; + } + + /** + * Removes the least recently used item from the cache. + * + * @method evict + * @memberof LRU + * @param {boolean} [bypass=false] - Whether to force eviction even when cache is empty. + * @returns {LRU} The LRU instance for method chaining. + * @example + * cache.set('old', 'value').set('new', 'value'); + * cache.evict(); // Removes 'old' item + * @see {@link LRU#setWithEvicted} + * @since 1.0.0 + */ + evict(bypass = false) { + if (bypass || this.size > 0) { + const item = this.first; + + if (!item) { + return this; + } + + delete this.items[item.key]; + + if (--this.size === 0) { + this.first = null; + this.last = null; + } else { + this.first = item.next; + this.first.prev = null; + } + + item.next = null; + } + + return this; + } + + /** + * Returns the expiration timestamp for a given key. + * + * @method expiresAt + * @memberof LRU + * @param {string} key - The key to check expiration for. + * @returns {number|undefined} The expiration timestamp in milliseconds, or undefined if key doesn't exist. + * @example + * const cache = new LRU(100, 5000); // 5 second TTL + * cache.set('key1', 'value1'); + * console.log(cache.expiresAt('key1')); // timestamp 5 seconds from now + * @see {@link LRU#get} + * @see {@link LRU#has} + * @since 1.0.0 + */ + expiresAt(key) { + const item = this.items[key]; + return item !== undefined ? item.expiry : undefined; + } + + /** + * Retrieves a value from the cache by key. Updates the item's position to most recently used. + * + * @method get + * @memberof LRU + * @param {string} key - The key to retrieve. + * @returns {*} The value associated with the key, or undefined if not found or expired. + * @example + * cache.set('key1', 'value1'); + * console.log(cache.get('key1')); // 'value1' + * console.log(cache.get('nonexistent')); // undefined + * @see {@link LRU#set} + * @see {@link LRU#has} + * @since 1.0.0 + */ + get(key) { + const item = this.items[key]; + + if (item !== undefined) { + // Check TTL only if enabled to avoid unnecessary Date.now() calls + if (this.ttl > 0) { + if (item.expiry <= Date.now()) { + this.delete(key); + + return undefined; + } + } + + // Fast LRU update without full set() overhead + this.moveToEnd(item); + + return item.value; + } + + return undefined; + } + + /** + * Checks if a key exists in the cache. + * + * @method has + * @memberof LRU + * @param {string} key - The key to check for. + * @returns {boolean} True if the key exists, false otherwise. + * @example + * cache.set('key1', 'value1'); + * console.log(cache.has('key1')); // true + * console.log(cache.has('nonexistent')); // false + * @see {@link LRU#get} + * @see {@link LRU#delete} + * @since 9.0.0 + */ + has(key) { + const item = this.items[key]; + return item !== undefined && (this.ttl === 0 || item.expiry > Date.now()); + } + + /** + * Efficiently moves an item to the end of the LRU list (most recently used position). + * This is an internal optimization method that avoids the overhead of the full set() operation + * when only LRU position needs to be updated. + * + * @method moveToEnd + * @memberof LRU + * @param {Object} item - The cache item with prev/next pointers to reposition. + * @private + * @since 11.3.5 + */ + moveToEnd(item) { + if (this.last === item) { + return; + } + + if (item.prev !== null) { + item.prev.next = item.next; + } + + if (item.next !== null) { + item.next.prev = item.prev; + } + + if (this.first === item) { + this.first = item.next; + } + + item.prev = this.last; + item.next = null; + this.last.next = item; + this.last = item; + } + + /** + * Returns an array of all keys in the cache, ordered from least to most recently used. + * + * @method keys + * @memberof LRU + * @returns {string[]} Array of keys in LRU order. + * @example + * cache.set('a', 1).set('b', 2); + * cache.get('a'); // Move 'a' to most recent + * console.log(cache.keys()); // ['b', 'a'] + * @see {@link LRU#values} + * @see {@link LRU#entries} + * @since 9.0.0 + */ + keys() { + const result = Array.from({ length: this.size }); + let x = this.first; + let i = 0; + + while (x !== null) { + result[i++] = x.key; + x = x.next; + } + + return result; + } + + /** + * Sets a value in the cache and returns any evicted item. + * + * @method setWithEvicted + * @memberof LRU + * @param {string} key - The key to set. + * @param {*} value - The value to store. + * @param {boolean} [resetTtl=this.resetTtl] - Whether to reset the TTL for this operation. + * @returns {Object|null} The evicted item (if any) with shape {key, value, expiry, prev, next}, or null. + * @example + * const cache = new LRU(2); + * cache.set('a', 1).set('b', 2); + * const evicted = cache.setWithEvicted('c', 3); // evicted = {key: 'a', value: 1, ...} + * @see {@link LRU#set} + * @see {@link LRU#evict} + * @since 11.3.0 + */ + setWithEvicted(key, value, resetTtl = this.resetTtl) { + let evicted = null; + let item = this.items[key]; + + if (item !== undefined) { + item.value = value; + if (resetTtl) { + item.expiry = this.ttl > 0 ? Date.now() + this.ttl : this.ttl; + } + this.moveToEnd(item); + } else { + if (this.max > 0 && this.size === this.max) { + evicted = { + key: this.first.key, + value: this.first.value, + expiry: this.first.expiry, + }; + this.evict(true); + } + + item = this.items[key] = { + expiry: this.ttl > 0 ? Date.now() + this.ttl : this.ttl, + key: key, + prev: this.last, + next: null, + value, + }; + + if (++this.size === 1) { + this.first = item; + } else { + this.last.next = item; + } + + this.last = item; + } + + return evicted; + } + + /** + * Sets a value in the cache. Updates the item's position to most recently used. + * + * @method set + * @memberof LRU + * @param {string} key - The key to set. + * @param {*} value - The value to store. + * @param {boolean} [bypass=false] - Internal parameter for setWithEvicted method. + * @param {boolean} [resetTtl=this.resetTtl] - Whether to reset the TTL for this operation. + * @returns {LRU} The LRU instance for method chaining. + * @example + * cache.set('key1', 'value1') + * .set('key2', 'value2') + * .set('key3', 'value3'); + * @see {@link LRU#get} + * @see {@link LRU#setWithEvicted} + * @since 1.0.0 + */ + set(key, value, bypass = false, resetTtl = this.resetTtl) { + let item = this.items[key]; + + if (bypass || item !== undefined) { + // Existing item: update value and position + item.value = value; + + if (bypass === false && resetTtl) { + item.expiry = this.ttl > 0 ? Date.now() + this.ttl : this.ttl; + } + + // Always move to end, but the bypass parameter affects TTL reset behavior + this.moveToEnd(item); + } else { + // New item: check for eviction and create + if (this.max > 0 && this.size === this.max) { + this.evict(true); + } + + item = this.items[key] = { + expiry: this.ttl > 0 ? Date.now() + this.ttl : this.ttl, + key: key, + prev: this.last, + next: null, + value, + }; + + if (++this.size === 1) { + this.first = item; + } else { + this.last.next = item; + } + + this.last = item; + } + + return this; + } + + /** + * Returns an array of all values in the cache for the specified keys. + * Order follows LRU order (least to most recently used). + * + * @method values + * @memberof LRU + * @param {string[]} [keys=this.keys()] - Array of keys to get values for. Defaults to all keys. + * @returns {Array<*>} Array of values corresponding to the keys in LRU order. + * @example + * cache.set('a', 1).set('b', 2); + * console.log(cache.values()); // [1, 2] + * console.log(cache.values(['a'])); // [1] + * @see {@link LRU#keys} + * @see {@link LRU#entries} + * @since 11.1.0 + */ + values(keys) { + if (keys === undefined) { + keys = this.keys(); + } + + const result = Array.from({ length: keys.length }); + for (let i = 0; i < keys.length; i++) { + const item = this.items[keys[i]]; + result[i] = item !== undefined ? item.value : undefined; + } + + return result; + } } /** @@ -489,20 +489,20 @@ class LRU { * @see {@link LRU} * @since 1.0.0 */ -function lru (max = 1000, ttl = 0, resetTtl = false) { - if (isNaN(max) || max < 0) { - throw new TypeError("Invalid max value"); - } +function lru(max = 1000, ttl = 0, resetTtl = false) { + if (isNaN(max) || max < 0) { + throw new TypeError("Invalid max value"); + } - if (isNaN(ttl) || ttl < 0) { - throw new TypeError("Invalid ttl value"); - } + if (isNaN(ttl) || ttl < 0) { + throw new TypeError("Invalid ttl value"); + } - if (typeof resetTtl !== "boolean") { - throw new TypeError("Invalid resetTtl value"); - } + if (typeof resetTtl !== "boolean") { + throw new TypeError("Invalid resetTtl value"); + } - return new LRU(max, ttl, resetTtl); + return new LRU(max, ttl, resetTtl); } exports.LRU = LRU; diff --git a/dist/tiny-lru.js b/dist/tiny-lru.js index 6031d8a..be888e9 100644 --- a/dist/tiny-lru.js +++ b/dist/tiny-lru.js @@ -24,443 +24,443 @@ * // After 5 seconds, key1 will be expired */ class LRU { - /** - * Creates a new LRU cache instance. - * Note: Constructor does not validate parameters. Use lru() factory function for parameter validation. - * - * @constructor - * @param {number} [max=0] - Maximum number of items to store. 0 means unlimited. - * @param {number} [ttl=0] - Time to live in milliseconds. 0 means no expiration. - * @param {boolean} [resetTtl=false] - Whether to reset TTL when accessing existing items via get(). - * @example - * const cache = new LRU(1000, 60000, true); // 1000 items, 1 minute TTL, reset on access - * @see {@link lru} For parameter validation - * @since 1.0.0 - */ - constructor (max = 0, ttl = 0, resetTtl = false) { - this.first = null; - this.items = Object.create(null); - this.last = null; - this.max = max; - this.resetTtl = resetTtl; - this.size = 0; - this.ttl = ttl; - } - - /** - * Removes all items from the cache. - * - * @method clear - * @memberof LRU - * @returns {LRU} The LRU instance for method chaining. - * @example - * cache.clear(); - * console.log(cache.size); // 0 - * @since 1.0.0 - */ - clear () { - this.first = null; - this.items = Object.create(null); - this.last = null; - this.size = 0; - - return this; - } - - /** - * Removes an item from the cache by key. - * - * @method delete - * @memberof LRU - * @param {string} key - The key of the item to delete. - * @returns {LRU} The LRU instance for method chaining. - * @example - * cache.set('key1', 'value1'); - * cache.delete('key1'); - * console.log(cache.has('key1')); // false - * @see {@link LRU#has} - * @see {@link LRU#clear} - * @since 1.0.0 - */ - delete (key) { - const item = this.items[key]; - - if (item !== undefined) { - delete this.items[key]; - this.size--; - - if (item.prev !== null) { - item.prev.next = item.next; - } - - if (item.next !== null) { - item.next.prev = item.prev; - } - - if (this.first === item) { - this.first = item.next; - } - - if (this.last === item) { - this.last = item.prev; - } - - item.prev = null; - item.next = null; - } - - return this; - } - - /** - * Returns an array of [key, value] pairs for the specified keys. - * Order follows LRU order (least to most recently used). - * - * @method entries - * @memberof LRU - * @param {string[]} [keys=this.keys()] - Array of keys to get entries for. Defaults to all keys. - * @returns {Array>} Array of [key, value] pairs in LRU order. - * @example - * cache.set('a', 1).set('b', 2); - * console.log(cache.entries()); // [['a', 1], ['b', 2]] - * console.log(cache.entries(['a'])); // [['a', 1]] - * @see {@link LRU#keys} - * @see {@link LRU#values} - * @since 11.1.0 - */ - entries (keys) { - if (keys === undefined) { - keys = this.keys(); - } - - const result = Array.from({ length: keys.length }); - for (let i = 0; i < keys.length; i++) { - const key = keys[i]; - const item = this.items[key]; - result[i] = [key, item !== undefined ? item.value : undefined]; - } - - return result; - } - - /** - * Removes the least recently used item from the cache. - * - * @method evict - * @memberof LRU - * @param {boolean} [bypass=false] - Whether to force eviction even when cache is empty. - * @returns {LRU} The LRU instance for method chaining. - * @example - * cache.set('old', 'value').set('new', 'value'); - * cache.evict(); // Removes 'old' item - * @see {@link LRU#setWithEvicted} - * @since 1.0.0 - */ - evict (bypass = false) { - if (bypass || this.size > 0) { - const item = this.first; - - if (!item) { - return this; - } - - delete this.items[item.key]; - - if (--this.size === 0) { - this.first = null; - this.last = null; - } else { - this.first = item.next; - this.first.prev = null; - } - - item.next = null; - } - - return this; - } - - /** - * Returns the expiration timestamp for a given key. - * - * @method expiresAt - * @memberof LRU - * @param {string} key - The key to check expiration for. - * @returns {number|undefined} The expiration timestamp in milliseconds, or undefined if key doesn't exist. - * @example - * const cache = new LRU(100, 5000); // 5 second TTL - * cache.set('key1', 'value1'); - * console.log(cache.expiresAt('key1')); // timestamp 5 seconds from now - * @see {@link LRU#get} - * @see {@link LRU#has} - * @since 1.0.0 - */ - expiresAt (key) { - const item = this.items[key]; - return item !== undefined ? item.expiry : undefined; - } - - /** - * Retrieves a value from the cache by key. Updates the item's position to most recently used. - * - * @method get - * @memberof LRU - * @param {string} key - The key to retrieve. - * @returns {*} The value associated with the key, or undefined if not found or expired. - * @example - * cache.set('key1', 'value1'); - * console.log(cache.get('key1')); // 'value1' - * console.log(cache.get('nonexistent')); // undefined - * @see {@link LRU#set} - * @see {@link LRU#has} - * @since 1.0.0 - */ - get (key) { - const item = this.items[key]; - - if (item !== undefined) { - // Check TTL only if enabled to avoid unnecessary Date.now() calls - if (this.ttl > 0) { - if (item.expiry <= Date.now()) { - this.delete(key); - - return undefined; - } - } - - // Fast LRU update without full set() overhead - this.moveToEnd(item); - - return item.value; - } - - return undefined; - } - - /** - * Checks if a key exists in the cache. - * - * @method has - * @memberof LRU - * @param {string} key - The key to check for. - * @returns {boolean} True if the key exists, false otherwise. - * @example - * cache.set('key1', 'value1'); - * console.log(cache.has('key1')); // true - * console.log(cache.has('nonexistent')); // false - * @see {@link LRU#get} - * @see {@link LRU#delete} - * @since 9.0.0 - */ - has (key) { - const item = this.items[key]; - return item !== undefined && (this.ttl === 0 || item.expiry > Date.now()); - } - - /** - * Efficiently moves an item to the end of the LRU list (most recently used position). - * This is an internal optimization method that avoids the overhead of the full set() operation - * when only LRU position needs to be updated. - * - * @method moveToEnd - * @memberof LRU - * @param {Object} item - The cache item with prev/next pointers to reposition. - * @private - * @since 11.3.5 - */ - moveToEnd (item) { - if (this.last === item) { - return; - } - - if (item.prev !== null) { - item.prev.next = item.next; - } - - if (item.next !== null) { - item.next.prev = item.prev; - } - - if (this.first === item) { - this.first = item.next; - } - - item.prev = this.last; - item.next = null; - this.last.next = item; - this.last = item; - } - - /** - * Returns an array of all keys in the cache, ordered from least to most recently used. - * - * @method keys - * @memberof LRU - * @returns {string[]} Array of keys in LRU order. - * @example - * cache.set('a', 1).set('b', 2); - * cache.get('a'); // Move 'a' to most recent - * console.log(cache.keys()); // ['b', 'a'] - * @see {@link LRU#values} - * @see {@link LRU#entries} - * @since 9.0.0 - */ - keys () { - const result = Array.from({ length: this.size }); - let x = this.first; - let i = 0; - - while (x !== null) { - result[i++] = x.key; - x = x.next; - } - - return result; - } - - /** - * Sets a value in the cache and returns any evicted item. - * - * @method setWithEvicted - * @memberof LRU - * @param {string} key - The key to set. - * @param {*} value - The value to store. - * @param {boolean} [resetTtl=this.resetTtl] - Whether to reset the TTL for this operation. - * @returns {Object|null} The evicted item (if any) with shape {key, value, expiry, prev, next}, or null. - * @example - * const cache = new LRU(2); - * cache.set('a', 1).set('b', 2); - * const evicted = cache.setWithEvicted('c', 3); // evicted = {key: 'a', value: 1, ...} - * @see {@link LRU#set} - * @see {@link LRU#evict} - * @since 11.3.0 - */ - setWithEvicted (key, value, resetTtl = this.resetTtl) { - let evicted = null; - let item = this.items[key]; - - if (item !== undefined) { - item.value = value; - if (resetTtl) { - item.expiry = this.ttl > 0 ? Date.now() + this.ttl : this.ttl; - } - this.moveToEnd(item); - } else { - if (this.max > 0 && this.size === this.max) { - evicted = { - key: this.first.key, - value: this.first.value, - expiry: this.first.expiry - }; - this.evict(true); - } - - item = this.items[key] = { - expiry: this.ttl > 0 ? Date.now() + this.ttl : this.ttl, - key: key, - prev: this.last, - next: null, - value - }; - - if (++this.size === 1) { - this.first = item; - } else { - this.last.next = item; - } - - this.last = item; - } - - return evicted; - } - - /** - * Sets a value in the cache. Updates the item's position to most recently used. - * - * @method set - * @memberof LRU - * @param {string} key - The key to set. - * @param {*} value - The value to store. - * @param {boolean} [bypass=false] - Internal parameter for setWithEvicted method. - * @param {boolean} [resetTtl=this.resetTtl] - Whether to reset the TTL for this operation. - * @returns {LRU} The LRU instance for method chaining. - * @example - * cache.set('key1', 'value1') - * .set('key2', 'value2') - * .set('key3', 'value3'); - * @see {@link LRU#get} - * @see {@link LRU#setWithEvicted} - * @since 1.0.0 - */ - set (key, value, bypass = false, resetTtl = this.resetTtl) { - let item = this.items[key]; - - if (bypass || item !== undefined) { - // Existing item: update value and position - item.value = value; - - if (bypass === false && resetTtl) { - item.expiry = this.ttl > 0 ? Date.now() + this.ttl : this.ttl; - } - - // Always move to end, but the bypass parameter affects TTL reset behavior - this.moveToEnd(item); - } else { - // New item: check for eviction and create - if (this.max > 0 && this.size === this.max) { - this.evict(true); - } - - item = this.items[key] = { - expiry: this.ttl > 0 ? Date.now() + this.ttl : this.ttl, - key: key, - prev: this.last, - next: null, - value - }; - - if (++this.size === 1) { - this.first = item; - } else { - this.last.next = item; - } - - this.last = item; - } - - return this; - } - - /** - * Returns an array of all values in the cache for the specified keys. - * Order follows LRU order (least to most recently used). - * - * @method values - * @memberof LRU - * @param {string[]} [keys=this.keys()] - Array of keys to get values for. Defaults to all keys. - * @returns {Array<*>} Array of values corresponding to the keys in LRU order. - * @example - * cache.set('a', 1).set('b', 2); - * console.log(cache.values()); // [1, 2] - * console.log(cache.values(['a'])); // [1] - * @see {@link LRU#keys} - * @see {@link LRU#entries} - * @since 11.1.0 - */ - values (keys) { - if (keys === undefined) { - keys = this.keys(); - } - - const result = Array.from({ length: keys.length }); - for (let i = 0; i < keys.length; i++) { - const item = this.items[keys[i]]; - result[i] = item !== undefined ? item.value : undefined; - } - - return result; - } + /** + * Creates a new LRU cache instance. + * Note: Constructor does not validate parameters. Use lru() factory function for parameter validation. + * + * @constructor + * @param {number} [max=0] - Maximum number of items to store. 0 means unlimited. + * @param {number} [ttl=0] - Time to live in milliseconds. 0 means no expiration. + * @param {boolean} [resetTtl=false] - Whether to reset TTL when accessing existing items via get(). + * @example + * const cache = new LRU(1000, 60000, true); // 1000 items, 1 minute TTL, reset on access + * @see {@link lru} For parameter validation + * @since 1.0.0 + */ + constructor(max = 0, ttl = 0, resetTtl = false) { + this.first = null; + this.items = Object.create(null); + this.last = null; + this.max = max; + this.resetTtl = resetTtl; + this.size = 0; + this.ttl = ttl; + } + + /** + * Removes all items from the cache. + * + * @method clear + * @memberof LRU + * @returns {LRU} The LRU instance for method chaining. + * @example + * cache.clear(); + * console.log(cache.size); // 0 + * @since 1.0.0 + */ + clear() { + this.first = null; + this.items = Object.create(null); + this.last = null; + this.size = 0; + + return this; + } + + /** + * Removes an item from the cache by key. + * + * @method delete + * @memberof LRU + * @param {string} key - The key of the item to delete. + * @returns {LRU} The LRU instance for method chaining. + * @example + * cache.set('key1', 'value1'); + * cache.delete('key1'); + * console.log(cache.has('key1')); // false + * @see {@link LRU#has} + * @see {@link LRU#clear} + * @since 1.0.0 + */ + delete(key) { + const item = this.items[key]; + + if (item !== undefined) { + delete this.items[key]; + this.size--; + + if (item.prev !== null) { + item.prev.next = item.next; + } + + if (item.next !== null) { + item.next.prev = item.prev; + } + + if (this.first === item) { + this.first = item.next; + } + + if (this.last === item) { + this.last = item.prev; + } + + item.prev = null; + item.next = null; + } + + return this; + } + + /** + * Returns an array of [key, value] pairs for the specified keys. + * Order follows LRU order (least to most recently used). + * + * @method entries + * @memberof LRU + * @param {string[]} [keys=this.keys()] - Array of keys to get entries for. Defaults to all keys. + * @returns {Array>} Array of [key, value] pairs in LRU order. + * @example + * cache.set('a', 1).set('b', 2); + * console.log(cache.entries()); // [['a', 1], ['b', 2]] + * console.log(cache.entries(['a'])); // [['a', 1]] + * @see {@link LRU#keys} + * @see {@link LRU#values} + * @since 11.1.0 + */ + entries(keys) { + if (keys === undefined) { + keys = this.keys(); + } + + const result = Array.from({ length: keys.length }); + for (let i = 0; i < keys.length; i++) { + const key = keys[i]; + const item = this.items[key]; + result[i] = [key, item !== undefined ? item.value : undefined]; + } + + return result; + } + + /** + * Removes the least recently used item from the cache. + * + * @method evict + * @memberof LRU + * @param {boolean} [bypass=false] - Whether to force eviction even when cache is empty. + * @returns {LRU} The LRU instance for method chaining. + * @example + * cache.set('old', 'value').set('new', 'value'); + * cache.evict(); // Removes 'old' item + * @see {@link LRU#setWithEvicted} + * @since 1.0.0 + */ + evict(bypass = false) { + if (bypass || this.size > 0) { + const item = this.first; + + if (!item) { + return this; + } + + delete this.items[item.key]; + + if (--this.size === 0) { + this.first = null; + this.last = null; + } else { + this.first = item.next; + this.first.prev = null; + } + + item.next = null; + } + + return this; + } + + /** + * Returns the expiration timestamp for a given key. + * + * @method expiresAt + * @memberof LRU + * @param {string} key - The key to check expiration for. + * @returns {number|undefined} The expiration timestamp in milliseconds, or undefined if key doesn't exist. + * @example + * const cache = new LRU(100, 5000); // 5 second TTL + * cache.set('key1', 'value1'); + * console.log(cache.expiresAt('key1')); // timestamp 5 seconds from now + * @see {@link LRU#get} + * @see {@link LRU#has} + * @since 1.0.0 + */ + expiresAt(key) { + const item = this.items[key]; + return item !== undefined ? item.expiry : undefined; + } + + /** + * Retrieves a value from the cache by key. Updates the item's position to most recently used. + * + * @method get + * @memberof LRU + * @param {string} key - The key to retrieve. + * @returns {*} The value associated with the key, or undefined if not found or expired. + * @example + * cache.set('key1', 'value1'); + * console.log(cache.get('key1')); // 'value1' + * console.log(cache.get('nonexistent')); // undefined + * @see {@link LRU#set} + * @see {@link LRU#has} + * @since 1.0.0 + */ + get(key) { + const item = this.items[key]; + + if (item !== undefined) { + // Check TTL only if enabled to avoid unnecessary Date.now() calls + if (this.ttl > 0) { + if (item.expiry <= Date.now()) { + this.delete(key); + + return undefined; + } + } + + // Fast LRU update without full set() overhead + this.moveToEnd(item); + + return item.value; + } + + return undefined; + } + + /** + * Checks if a key exists in the cache. + * + * @method has + * @memberof LRU + * @param {string} key - The key to check for. + * @returns {boolean} True if the key exists, false otherwise. + * @example + * cache.set('key1', 'value1'); + * console.log(cache.has('key1')); // true + * console.log(cache.has('nonexistent')); // false + * @see {@link LRU#get} + * @see {@link LRU#delete} + * @since 9.0.0 + */ + has(key) { + const item = this.items[key]; + return item !== undefined && (this.ttl === 0 || item.expiry > Date.now()); + } + + /** + * Efficiently moves an item to the end of the LRU list (most recently used position). + * This is an internal optimization method that avoids the overhead of the full set() operation + * when only LRU position needs to be updated. + * + * @method moveToEnd + * @memberof LRU + * @param {Object} item - The cache item with prev/next pointers to reposition. + * @private + * @since 11.3.5 + */ + moveToEnd(item) { + if (this.last === item) { + return; + } + + if (item.prev !== null) { + item.prev.next = item.next; + } + + if (item.next !== null) { + item.next.prev = item.prev; + } + + if (this.first === item) { + this.first = item.next; + } + + item.prev = this.last; + item.next = null; + this.last.next = item; + this.last = item; + } + + /** + * Returns an array of all keys in the cache, ordered from least to most recently used. + * + * @method keys + * @memberof LRU + * @returns {string[]} Array of keys in LRU order. + * @example + * cache.set('a', 1).set('b', 2); + * cache.get('a'); // Move 'a' to most recent + * console.log(cache.keys()); // ['b', 'a'] + * @see {@link LRU#values} + * @see {@link LRU#entries} + * @since 9.0.0 + */ + keys() { + const result = Array.from({ length: this.size }); + let x = this.first; + let i = 0; + + while (x !== null) { + result[i++] = x.key; + x = x.next; + } + + return result; + } + + /** + * Sets a value in the cache and returns any evicted item. + * + * @method setWithEvicted + * @memberof LRU + * @param {string} key - The key to set. + * @param {*} value - The value to store. + * @param {boolean} [resetTtl=this.resetTtl] - Whether to reset the TTL for this operation. + * @returns {Object|null} The evicted item (if any) with shape {key, value, expiry, prev, next}, or null. + * @example + * const cache = new LRU(2); + * cache.set('a', 1).set('b', 2); + * const evicted = cache.setWithEvicted('c', 3); // evicted = {key: 'a', value: 1, ...} + * @see {@link LRU#set} + * @see {@link LRU#evict} + * @since 11.3.0 + */ + setWithEvicted(key, value, resetTtl = this.resetTtl) { + let evicted = null; + let item = this.items[key]; + + if (item !== undefined) { + item.value = value; + if (resetTtl) { + item.expiry = this.ttl > 0 ? Date.now() + this.ttl : this.ttl; + } + this.moveToEnd(item); + } else { + if (this.max > 0 && this.size === this.max) { + evicted = { + key: this.first.key, + value: this.first.value, + expiry: this.first.expiry, + }; + this.evict(true); + } + + item = this.items[key] = { + expiry: this.ttl > 0 ? Date.now() + this.ttl : this.ttl, + key: key, + prev: this.last, + next: null, + value, + }; + + if (++this.size === 1) { + this.first = item; + } else { + this.last.next = item; + } + + this.last = item; + } + + return evicted; + } + + /** + * Sets a value in the cache. Updates the item's position to most recently used. + * + * @method set + * @memberof LRU + * @param {string} key - The key to set. + * @param {*} value - The value to store. + * @param {boolean} [bypass=false] - Internal parameter for setWithEvicted method. + * @param {boolean} [resetTtl=this.resetTtl] - Whether to reset the TTL for this operation. + * @returns {LRU} The LRU instance for method chaining. + * @example + * cache.set('key1', 'value1') + * .set('key2', 'value2') + * .set('key3', 'value3'); + * @see {@link LRU#get} + * @see {@link LRU#setWithEvicted} + * @since 1.0.0 + */ + set(key, value, bypass = false, resetTtl = this.resetTtl) { + let item = this.items[key]; + + if (bypass || item !== undefined) { + // Existing item: update value and position + item.value = value; + + if (bypass === false && resetTtl) { + item.expiry = this.ttl > 0 ? Date.now() + this.ttl : this.ttl; + } + + // Always move to end, but the bypass parameter affects TTL reset behavior + this.moveToEnd(item); + } else { + // New item: check for eviction and create + if (this.max > 0 && this.size === this.max) { + this.evict(true); + } + + item = this.items[key] = { + expiry: this.ttl > 0 ? Date.now() + this.ttl : this.ttl, + key: key, + prev: this.last, + next: null, + value, + }; + + if (++this.size === 1) { + this.first = item; + } else { + this.last.next = item; + } + + this.last = item; + } + + return this; + } + + /** + * Returns an array of all values in the cache for the specified keys. + * Order follows LRU order (least to most recently used). + * + * @method values + * @memberof LRU + * @param {string[]} [keys=this.keys()] - Array of keys to get values for. Defaults to all keys. + * @returns {Array<*>} Array of values corresponding to the keys in LRU order. + * @example + * cache.set('a', 1).set('b', 2); + * console.log(cache.values()); // [1, 2] + * console.log(cache.values(['a'])); // [1] + * @see {@link LRU#keys} + * @see {@link LRU#entries} + * @since 11.1.0 + */ + values(keys) { + if (keys === undefined) { + keys = this.keys(); + } + + const result = Array.from({ length: keys.length }); + for (let i = 0; i < keys.length; i++) { + const item = this.items[keys[i]]; + result[i] = item !== undefined ? item.value : undefined; + } + + return result; + } } /** @@ -487,18 +487,18 @@ class LRU { * @see {@link LRU} * @since 1.0.0 */ -function lru (max = 1000, ttl = 0, resetTtl = false) { - if (isNaN(max) || max < 0) { - throw new TypeError("Invalid max value"); - } +function lru(max = 1000, ttl = 0, resetTtl = false) { + if (isNaN(max) || max < 0) { + throw new TypeError("Invalid max value"); + } - if (isNaN(ttl) || ttl < 0) { - throw new TypeError("Invalid ttl value"); - } + if (isNaN(ttl) || ttl < 0) { + throw new TypeError("Invalid ttl value"); + } - if (typeof resetTtl !== "boolean") { - throw new TypeError("Invalid resetTtl value"); - } + if (typeof resetTtl !== "boolean") { + throw new TypeError("Invalid resetTtl value"); + } - return new LRU(max, ttl, resetTtl); + return new LRU(max, ttl, resetTtl); }export{LRU,lru}; \ No newline at end of file diff --git a/dist/tiny-lru.min.js.map b/dist/tiny-lru.min.js.map index d1b4589..6365343 100644 --- a/dist/tiny-lru.min.js.map +++ b/dist/tiny-lru.min.js.map @@ -1 +1 @@ -{"version":3,"file":"tiny-lru.min.js","sources":["../src/lru.js"],"sourcesContent":["/**\n * A high-performance Least Recently Used (LRU) cache implementation with optional TTL support.\n * Items are automatically evicted when the cache reaches its maximum size,\n * removing the least recently used items first. All core operations (get, set, delete) are O(1).\n *\n * @class LRU\n * @example\n * // Create a cache with max 100 items\n * const cache = new LRU(100);\n * cache.set('key1', 'value1');\n * console.log(cache.get('key1')); // 'value1'\n *\n * @example\n * // Create a cache with TTL\n * const cache = new LRU(100, 5000); // 5 second TTL\n * cache.set('key1', 'value1');\n * // After 5 seconds, key1 will be expired\n */\nexport class LRU {\n\t/**\n\t * Creates a new LRU cache instance.\n\t * Note: Constructor does not validate parameters. Use lru() factory function for parameter validation.\n\t *\n\t * @constructor\n\t * @param {number} [max=0] - Maximum number of items to store. 0 means unlimited.\n\t * @param {number} [ttl=0] - Time to live in milliseconds. 0 means no expiration.\n\t * @param {boolean} [resetTtl=false] - Whether to reset TTL when accessing existing items via get().\n\t * @example\n\t * const cache = new LRU(1000, 60000, true); // 1000 items, 1 minute TTL, reset on access\n\t * @see {@link lru} For parameter validation\n\t * @since 1.0.0\n\t */\n\tconstructor (max = 0, ttl = 0, resetTtl = false) {\n\t\tthis.first = null;\n\t\tthis.items = Object.create(null);\n\t\tthis.last = null;\n\t\tthis.max = max;\n\t\tthis.resetTtl = resetTtl;\n\t\tthis.size = 0;\n\t\tthis.ttl = ttl;\n\t}\n\n\t/**\n\t * Removes all items from the cache.\n\t *\n\t * @method clear\n\t * @memberof LRU\n\t * @returns {LRU} The LRU instance for method chaining.\n\t * @example\n\t * cache.clear();\n\t * console.log(cache.size); // 0\n\t * @since 1.0.0\n\t */\n\tclear () {\n\t\tthis.first = null;\n\t\tthis.items = Object.create(null);\n\t\tthis.last = null;\n\t\tthis.size = 0;\n\n\t\treturn this;\n\t}\n\n\t/**\n\t * Removes an item from the cache by key.\n\t *\n\t * @method delete\n\t * @memberof LRU\n\t * @param {string} key - The key of the item to delete.\n\t * @returns {LRU} The LRU instance for method chaining.\n\t * @example\n\t * cache.set('key1', 'value1');\n\t * cache.delete('key1');\n\t * console.log(cache.has('key1')); // false\n\t * @see {@link LRU#has}\n\t * @see {@link LRU#clear}\n\t * @since 1.0.0\n\t */\n\tdelete (key) {\n\t\tconst item = this.items[key];\n\n\t\tif (item !== undefined) {\n\t\t\tdelete this.items[key];\n\t\t\tthis.size--;\n\n\t\t\tif (item.prev !== null) {\n\t\t\t\titem.prev.next = item.next;\n\t\t\t}\n\n\t\t\tif (item.next !== null) {\n\t\t\t\titem.next.prev = item.prev;\n\t\t\t}\n\n\t\t\tif (this.first === item) {\n\t\t\t\tthis.first = item.next;\n\t\t\t}\n\n\t\t\tif (this.last === item) {\n\t\t\t\tthis.last = item.prev;\n\t\t\t}\n\n\t\t\titem.prev = null;\n\t\t\titem.next = null;\n\t\t}\n\n\t\treturn this;\n\t}\n\n\t/**\n\t * Returns an array of [key, value] pairs for the specified keys.\n\t * Order follows LRU order (least to most recently used).\n\t *\n\t * @method entries\n\t * @memberof LRU\n\t * @param {string[]} [keys=this.keys()] - Array of keys to get entries for. Defaults to all keys.\n\t * @returns {Array>} Array of [key, value] pairs in LRU order.\n\t * @example\n\t * cache.set('a', 1).set('b', 2);\n\t * console.log(cache.entries()); // [['a', 1], ['b', 2]]\n\t * console.log(cache.entries(['a'])); // [['a', 1]]\n\t * @see {@link LRU#keys}\n\t * @see {@link LRU#values}\n\t * @since 11.1.0\n\t */\n\tentries (keys) {\n\t\tif (keys === undefined) {\n\t\t\tkeys = this.keys();\n\t\t}\n\n\t\tconst result = Array.from({ length: keys.length });\n\t\tfor (let i = 0; i < keys.length; i++) {\n\t\t\tconst key = keys[i];\n\t\t\tconst item = this.items[key];\n\t\t\tresult[i] = [key, item !== undefined ? item.value : undefined];\n\t\t}\n\n\t\treturn result;\n\t}\n\n\t/**\n\t * Removes the least recently used item from the cache.\n\t *\n\t * @method evict\n\t * @memberof LRU\n\t * @param {boolean} [bypass=false] - Whether to force eviction even when cache is empty.\n\t * @returns {LRU} The LRU instance for method chaining.\n\t * @example\n\t * cache.set('old', 'value').set('new', 'value');\n\t * cache.evict(); // Removes 'old' item\n\t * @see {@link LRU#setWithEvicted}\n\t * @since 1.0.0\n\t */\n\tevict (bypass = false) {\n\t\tif (bypass || this.size > 0) {\n\t\t\tconst item = this.first;\n\n\t\t\tif (!item) {\n\t\t\t\treturn this;\n\t\t\t}\n\n\t\t\tdelete this.items[item.key];\n\n\t\t\tif (--this.size === 0) {\n\t\t\t\tthis.first = null;\n\t\t\t\tthis.last = null;\n\t\t\t} else {\n\t\t\t\tthis.first = item.next;\n\t\t\t\tthis.first.prev = null;\n\t\t\t}\n\n\t\t\titem.next = null;\n\t\t}\n\n\t\treturn this;\n\t}\n\n\t/**\n\t * Returns the expiration timestamp for a given key.\n\t *\n\t * @method expiresAt\n\t * @memberof LRU\n\t * @param {string} key - The key to check expiration for.\n\t * @returns {number|undefined} The expiration timestamp in milliseconds, or undefined if key doesn't exist.\n\t * @example\n\t * const cache = new LRU(100, 5000); // 5 second TTL\n\t * cache.set('key1', 'value1');\n\t * console.log(cache.expiresAt('key1')); // timestamp 5 seconds from now\n\t * @see {@link LRU#get}\n\t * @see {@link LRU#has}\n\t * @since 1.0.0\n\t */\n\texpiresAt (key) {\n\t\tconst item = this.items[key];\n\t\treturn item !== undefined ? item.expiry : undefined;\n\t}\n\n\t/**\n\t * Retrieves a value from the cache by key. Updates the item's position to most recently used.\n\t *\n\t * @method get\n\t * @memberof LRU\n\t * @param {string} key - The key to retrieve.\n\t * @returns {*} The value associated with the key, or undefined if not found or expired.\n\t * @example\n\t * cache.set('key1', 'value1');\n\t * console.log(cache.get('key1')); // 'value1'\n\t * console.log(cache.get('nonexistent')); // undefined\n\t * @see {@link LRU#set}\n\t * @see {@link LRU#has}\n\t * @since 1.0.0\n\t */\n\tget (key) {\n\t\tconst item = this.items[key];\n\n\t\tif (item !== undefined) {\n\t\t\t// Check TTL only if enabled to avoid unnecessary Date.now() calls\n\t\t\tif (this.ttl > 0) {\n\t\t\t\tif (item.expiry <= Date.now()) {\n\t\t\t\t\tthis.delete(key);\n\n\t\t\t\t\treturn undefined;\n\t\t\t\t}\n\t\t\t}\n\n\t\t\t// Fast LRU update without full set() overhead\n\t\t\tthis.moveToEnd(item);\n\n\t\t\treturn item.value;\n\t\t}\n\n\t\treturn undefined;\n\t}\n\n\t/**\n\t * Checks if a key exists in the cache.\n\t *\n\t * @method has\n\t * @memberof LRU\n\t * @param {string} key - The key to check for.\n\t * @returns {boolean} True if the key exists, false otherwise.\n\t * @example\n\t * cache.set('key1', 'value1');\n\t * console.log(cache.has('key1')); // true\n\t * console.log(cache.has('nonexistent')); // false\n\t * @see {@link LRU#get}\n\t * @see {@link LRU#delete}\n\t * @since 9.0.0\n\t */\n\thas (key) {\n\t\tconst item = this.items[key];\n\t\treturn item !== undefined && (this.ttl === 0 || item.expiry > Date.now());\n\t}\n\n\t/**\n\t * Efficiently moves an item to the end of the LRU list (most recently used position).\n\t * This is an internal optimization method that avoids the overhead of the full set() operation\n\t * when only LRU position needs to be updated.\n\t *\n\t * @method moveToEnd\n\t * @memberof LRU\n\t * @param {Object} item - The cache item with prev/next pointers to reposition.\n\t * @private\n\t * @since 11.3.5\n\t */\n\tmoveToEnd (item) {\n\t\tif (this.last === item) {\n\t\t\treturn;\n\t\t}\n\n\t\tif (item.prev !== null) {\n\t\t\titem.prev.next = item.next;\n\t\t}\n\n\t\tif (item.next !== null) {\n\t\t\titem.next.prev = item.prev;\n\t\t}\n\n\t\tif (this.first === item) {\n\t\t\tthis.first = item.next;\n\t\t}\n\n\t\titem.prev = this.last;\n\t\titem.next = null;\n\t\tthis.last.next = item;\n\t\tthis.last = item;\n\t}\n\n\t/**\n\t * Returns an array of all keys in the cache, ordered from least to most recently used.\n\t *\n\t * @method keys\n\t * @memberof LRU\n\t * @returns {string[]} Array of keys in LRU order.\n\t * @example\n\t * cache.set('a', 1).set('b', 2);\n\t * cache.get('a'); // Move 'a' to most recent\n\t * console.log(cache.keys()); // ['b', 'a']\n\t * @see {@link LRU#values}\n\t * @see {@link LRU#entries}\n\t * @since 9.0.0\n\t */\n\tkeys () {\n\t\tconst result = Array.from({ length: this.size });\n\t\tlet x = this.first;\n\t\tlet i = 0;\n\n\t\twhile (x !== null) {\n\t\t\tresult[i++] = x.key;\n\t\t\tx = x.next;\n\t\t}\n\n\t\treturn result;\n\t}\n\n\t/**\n\t * Sets a value in the cache and returns any evicted item.\n\t *\n\t * @method setWithEvicted\n\t * @memberof LRU\n\t * @param {string} key - The key to set.\n\t * @param {*} value - The value to store.\n\t * @param {boolean} [resetTtl=this.resetTtl] - Whether to reset the TTL for this operation.\n\t * @returns {Object|null} The evicted item (if any) with shape {key, value, expiry, prev, next}, or null.\n\t * @example\n\t * const cache = new LRU(2);\n\t * cache.set('a', 1).set('b', 2);\n\t * const evicted = cache.setWithEvicted('c', 3); // evicted = {key: 'a', value: 1, ...}\n\t * @see {@link LRU#set}\n\t * @see {@link LRU#evict}\n\t * @since 11.3.0\n\t */\n\tsetWithEvicted (key, value, resetTtl = this.resetTtl) {\n\t\tlet evicted = null;\n\t\tlet item = this.items[key];\n\n\t\tif (item !== undefined) {\n\t\t\titem.value = value;\n\t\t\tif (resetTtl) {\n\t\t\t\titem.expiry = this.ttl > 0 ? Date.now() + this.ttl : this.ttl;\n\t\t\t}\n\t\t\tthis.moveToEnd(item);\n\t\t} else {\n\t\t\tif (this.max > 0 && this.size === this.max) {\n\t\t\t\tevicted = {\n\t\t\t\t\tkey: this.first.key,\n\t\t\t\t\tvalue: this.first.value,\n\t\t\t\t\texpiry: this.first.expiry\n\t\t\t\t};\n\t\t\t\tthis.evict(true);\n\t\t\t}\n\n\t\t\titem = this.items[key] = {\n\t\t\t\texpiry: this.ttl > 0 ? Date.now() + this.ttl : this.ttl,\n\t\t\t\tkey: key,\n\t\t\t\tprev: this.last,\n\t\t\t\tnext: null,\n\t\t\t\tvalue\n\t\t\t};\n\n\t\t\tif (++this.size === 1) {\n\t\t\t\tthis.first = item;\n\t\t\t} else {\n\t\t\t\tthis.last.next = item;\n\t\t\t}\n\n\t\t\tthis.last = item;\n\t\t}\n\n\t\treturn evicted;\n\t}\n\n\t/**\n\t * Sets a value in the cache. Updates the item's position to most recently used.\n\t *\n\t * @method set\n\t * @memberof LRU\n\t * @param {string} key - The key to set.\n\t * @param {*} value - The value to store.\n\t * @param {boolean} [bypass=false] - Internal parameter for setWithEvicted method.\n\t * @param {boolean} [resetTtl=this.resetTtl] - Whether to reset the TTL for this operation.\n\t * @returns {LRU} The LRU instance for method chaining.\n\t * @example\n\t * cache.set('key1', 'value1')\n\t * .set('key2', 'value2')\n\t * .set('key3', 'value3');\n\t * @see {@link LRU#get}\n\t * @see {@link LRU#setWithEvicted}\n\t * @since 1.0.0\n\t */\n\tset (key, value, bypass = false, resetTtl = this.resetTtl) {\n\t\tlet item = this.items[key];\n\n\t\tif (bypass || item !== undefined) {\n\t\t\t// Existing item: update value and position\n\t\t\titem.value = value;\n\n\t\t\tif (bypass === false && resetTtl) {\n\t\t\t\titem.expiry = this.ttl > 0 ? Date.now() + this.ttl : this.ttl;\n\t\t\t}\n\n\t\t\t// Always move to end, but the bypass parameter affects TTL reset behavior\n\t\t\tthis.moveToEnd(item);\n\t\t} else {\n\t\t\t// New item: check for eviction and create\n\t\t\tif (this.max > 0 && this.size === this.max) {\n\t\t\t\tthis.evict(true);\n\t\t\t}\n\n\t\t\titem = this.items[key] = {\n\t\t\t\texpiry: this.ttl > 0 ? Date.now() + this.ttl : this.ttl,\n\t\t\t\tkey: key,\n\t\t\t\tprev: this.last,\n\t\t\t\tnext: null,\n\t\t\t\tvalue\n\t\t\t};\n\n\t\t\tif (++this.size === 1) {\n\t\t\t\tthis.first = item;\n\t\t\t} else {\n\t\t\t\tthis.last.next = item;\n\t\t\t}\n\n\t\t\tthis.last = item;\n\t\t}\n\n\t\treturn this;\n\t}\n\n\t/**\n\t * Returns an array of all values in the cache for the specified keys.\n\t * Order follows LRU order (least to most recently used).\n\t *\n\t * @method values\n\t * @memberof LRU\n\t * @param {string[]} [keys=this.keys()] - Array of keys to get values for. Defaults to all keys.\n\t * @returns {Array<*>} Array of values corresponding to the keys in LRU order.\n\t * @example\n\t * cache.set('a', 1).set('b', 2);\n\t * console.log(cache.values()); // [1, 2]\n\t * console.log(cache.values(['a'])); // [1]\n\t * @see {@link LRU#keys}\n\t * @see {@link LRU#entries}\n\t * @since 11.1.0\n\t */\n\tvalues (keys) {\n\t\tif (keys === undefined) {\n\t\t\tkeys = this.keys();\n\t\t}\n\n\t\tconst result = Array.from({ length: keys.length });\n\t\tfor (let i = 0; i < keys.length; i++) {\n\t\t\tconst item = this.items[keys[i]];\n\t\t\tresult[i] = item !== undefined ? item.value : undefined;\n\t\t}\n\n\t\treturn result;\n\t}\n}\n\n/**\n * Factory function to create a new LRU cache instance with parameter validation.\n *\n * @function lru\n * @param {number} [max=1000] - Maximum number of items to store. Must be >= 0. Use 0 for unlimited size.\n * @param {number} [ttl=0] - Time to live in milliseconds. Must be >= 0. Use 0 for no expiration.\n * @param {boolean} [resetTtl=false] - Whether to reset TTL when accessing existing items via get().\n * @returns {LRU} A new LRU cache instance.\n * @throws {TypeError} When parameters are invalid (negative numbers or wrong types).\n * @example\n * // Create cache with factory function\n * const cache = lru(100, 5000, true);\n * cache.set('key', 'value');\n *\n * @example\n * // Error handling\n * try {\n * const cache = lru(-1); // Invalid max\n * } catch (error) {\n * console.error(error.message); // \"Invalid max value\"\n * }\n * @see {@link LRU}\n * @since 1.0.0\n */\nexport function lru (max = 1000, ttl = 0, resetTtl = false) {\n\tif (isNaN(max) || max < 0) {\n\t\tthrow new TypeError(\"Invalid max value\");\n\t}\n\n\tif (isNaN(ttl) || ttl < 0) {\n\t\tthrow new TypeError(\"Invalid ttl value\");\n\t}\n\n\tif (typeof resetTtl !== \"boolean\") {\n\t\tthrow new TypeError(\"Invalid resetTtl value\");\n\t}\n\n\treturn new LRU(max, ttl, 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\ No newline at end of file +{"version":3,"file":"tiny-lru.min.js","sources":["../src/lru.js"],"sourcesContent":["/**\n * A high-performance Least Recently Used (LRU) cache implementation with optional TTL support.\n * Items are automatically evicted when the cache reaches its maximum size,\n * removing the least recently used items first. All core operations (get, set, delete) are O(1).\n *\n * @class LRU\n * @example\n * // Create a cache with max 100 items\n * const cache = new LRU(100);\n * cache.set('key1', 'value1');\n * console.log(cache.get('key1')); // 'value1'\n *\n * @example\n * // Create a cache with TTL\n * const cache = new LRU(100, 5000); // 5 second TTL\n * cache.set('key1', 'value1');\n * // After 5 seconds, key1 will be expired\n */\nexport class LRU {\n /**\n * Creates a new LRU cache instance.\n * Note: Constructor does not validate parameters. Use lru() factory function for parameter validation.\n *\n * @constructor\n * @param {number} [max=0] - Maximum number of items to store. 0 means unlimited.\n * @param {number} [ttl=0] - Time to live in milliseconds. 0 means no expiration.\n * @param {boolean} [resetTtl=false] - Whether to reset TTL when accessing existing items via get().\n * @example\n * const cache = new LRU(1000, 60000, true); // 1000 items, 1 minute TTL, reset on access\n * @see {@link lru} For parameter validation\n * @since 1.0.0\n */\n constructor(max = 0, ttl = 0, resetTtl = false) {\n this.first = null;\n this.items = Object.create(null);\n this.last = null;\n this.max = max;\n this.resetTtl = resetTtl;\n this.size = 0;\n this.ttl = ttl;\n }\n\n /**\n * Removes all items from the cache.\n *\n * @method clear\n * @memberof LRU\n * @returns {LRU} The LRU instance for method chaining.\n * @example\n * cache.clear();\n * console.log(cache.size); // 0\n * @since 1.0.0\n */\n clear() {\n this.first = null;\n this.items = Object.create(null);\n this.last = null;\n this.size = 0;\n\n return this;\n }\n\n /**\n * Removes an item from the cache by key.\n *\n * @method delete\n * @memberof LRU\n * @param {string} key - The key of the item to delete.\n * @returns {LRU} The LRU instance for method chaining.\n * @example\n * cache.set('key1', 'value1');\n * cache.delete('key1');\n * console.log(cache.has('key1')); // false\n * @see {@link LRU#has}\n * @see {@link LRU#clear}\n * @since 1.0.0\n */\n delete(key) {\n const item = this.items[key];\n\n if (item !== undefined) {\n delete this.items[key];\n this.size--;\n\n if (item.prev !== null) {\n item.prev.next = item.next;\n }\n\n if (item.next !== null) {\n item.next.prev = item.prev;\n }\n\n if (this.first === item) {\n this.first = item.next;\n }\n\n if (this.last === item) {\n this.last = item.prev;\n }\n\n item.prev = null;\n item.next = null;\n }\n\n return this;\n }\n\n /**\n * Returns an array of [key, value] pairs for the specified keys.\n * Order follows LRU order (least to most recently used).\n *\n * @method entries\n * @memberof LRU\n * @param {string[]} [keys=this.keys()] - Array of keys to get entries for. Defaults to all keys.\n * @returns {Array>} Array of [key, value] pairs in LRU order.\n * @example\n * cache.set('a', 1).set('b', 2);\n * console.log(cache.entries()); // [['a', 1], ['b', 2]]\n * console.log(cache.entries(['a'])); // [['a', 1]]\n * @see {@link LRU#keys}\n * @see {@link LRU#values}\n * @since 11.1.0\n */\n entries(keys) {\n if (keys === undefined) {\n keys = this.keys();\n }\n\n const result = Array.from({ length: keys.length });\n for (let i = 0; i < keys.length; i++) {\n const key = keys[i];\n const item = this.items[key];\n result[i] = [key, item !== undefined ? item.value : undefined];\n }\n\n return result;\n }\n\n /**\n * Removes the least recently used item from the cache.\n *\n * @method evict\n * @memberof LRU\n * @param {boolean} [bypass=false] - Whether to force eviction even when cache is empty.\n * @returns {LRU} The LRU instance for method chaining.\n * @example\n * cache.set('old', 'value').set('new', 'value');\n * cache.evict(); // Removes 'old' item\n * @see {@link LRU#setWithEvicted}\n * @since 1.0.0\n */\n evict(bypass = false) {\n if (bypass || this.size > 0) {\n const item = this.first;\n\n if (!item) {\n return this;\n }\n\n delete this.items[item.key];\n\n if (--this.size === 0) {\n this.first = null;\n this.last = null;\n } else {\n this.first = item.next;\n this.first.prev = null;\n }\n\n item.next = null;\n }\n\n return this;\n }\n\n /**\n * Returns the expiration timestamp for a given key.\n *\n * @method expiresAt\n * @memberof LRU\n * @param {string} key - The key to check expiration for.\n * @returns {number|undefined} The expiration timestamp in milliseconds, or undefined if key doesn't exist.\n * @example\n * const cache = new LRU(100, 5000); // 5 second TTL\n * cache.set('key1', 'value1');\n * console.log(cache.expiresAt('key1')); // timestamp 5 seconds from now\n * @see {@link LRU#get}\n * @see {@link LRU#has}\n * @since 1.0.0\n */\n expiresAt(key) {\n const item = this.items[key];\n return item !== undefined ? item.expiry : undefined;\n }\n\n /**\n * Retrieves a value from the cache by key. Updates the item's position to most recently used.\n *\n * @method get\n * @memberof LRU\n * @param {string} key - The key to retrieve.\n * @returns {*} The value associated with the key, or undefined if not found or expired.\n * @example\n * cache.set('key1', 'value1');\n * console.log(cache.get('key1')); // 'value1'\n * console.log(cache.get('nonexistent')); // undefined\n * @see {@link LRU#set}\n * @see {@link LRU#has}\n * @since 1.0.0\n */\n get(key) {\n const item = this.items[key];\n\n if (item !== undefined) {\n // Check TTL only if enabled to avoid unnecessary Date.now() calls\n if (this.ttl > 0) {\n if (item.expiry <= Date.now()) {\n this.delete(key);\n\n return undefined;\n }\n }\n\n // Fast LRU update without full set() overhead\n this.moveToEnd(item);\n\n return item.value;\n }\n\n return undefined;\n }\n\n /**\n * Checks if a key exists in the cache.\n *\n * @method has\n * @memberof LRU\n * @param {string} key - The key to check for.\n * @returns {boolean} True if the key exists, false otherwise.\n * @example\n * cache.set('key1', 'value1');\n * console.log(cache.has('key1')); // true\n * console.log(cache.has('nonexistent')); // false\n * @see {@link LRU#get}\n * @see {@link LRU#delete}\n * @since 9.0.0\n */\n has(key) {\n const item = this.items[key];\n return item !== undefined && (this.ttl === 0 || item.expiry > Date.now());\n }\n\n /**\n * Efficiently moves an item to the end of the LRU list (most recently used position).\n * This is an internal optimization method that avoids the overhead of the full set() operation\n * when only LRU position needs to be updated.\n *\n * @method moveToEnd\n * @memberof LRU\n * @param {Object} item - The cache item with prev/next pointers to reposition.\n * @private\n * @since 11.3.5\n */\n moveToEnd(item) {\n if (this.last === item) {\n return;\n }\n\n if (item.prev !== null) {\n item.prev.next = item.next;\n }\n\n if (item.next !== null) {\n item.next.prev = item.prev;\n }\n\n if (this.first === item) {\n this.first = item.next;\n }\n\n item.prev = this.last;\n item.next = null;\n this.last.next = item;\n this.last = item;\n }\n\n /**\n * Returns an array of all keys in the cache, ordered from least to most recently used.\n *\n * @method keys\n * @memberof LRU\n * @returns {string[]} Array of keys in LRU order.\n * @example\n * cache.set('a', 1).set('b', 2);\n * cache.get('a'); // Move 'a' to most recent\n * console.log(cache.keys()); // ['b', 'a']\n * @see {@link LRU#values}\n * @see {@link LRU#entries}\n * @since 9.0.0\n */\n keys() {\n const result = Array.from({ length: this.size });\n let x = this.first;\n let i = 0;\n\n while (x !== null) {\n result[i++] = x.key;\n x = x.next;\n }\n\n return result;\n }\n\n /**\n * Sets a value in the cache and returns any evicted item.\n *\n * @method setWithEvicted\n * @memberof LRU\n * @param {string} key - The key to set.\n * @param {*} value - The value to store.\n * @param {boolean} [resetTtl=this.resetTtl] - Whether to reset the TTL for this operation.\n * @returns {Object|null} The evicted item (if any) with shape {key, value, expiry, prev, next}, or null.\n * @example\n * const cache = new LRU(2);\n * cache.set('a', 1).set('b', 2);\n * const evicted = cache.setWithEvicted('c', 3); // evicted = {key: 'a', value: 1, ...}\n * @see {@link LRU#set}\n * @see {@link LRU#evict}\n * @since 11.3.0\n */\n setWithEvicted(key, value, resetTtl = this.resetTtl) {\n let evicted = null;\n let item = this.items[key];\n\n if (item !== undefined) {\n item.value = value;\n if (resetTtl) {\n item.expiry = this.ttl > 0 ? Date.now() + this.ttl : this.ttl;\n }\n this.moveToEnd(item);\n } else {\n if (this.max > 0 && this.size === this.max) {\n evicted = {\n key: this.first.key,\n value: this.first.value,\n expiry: this.first.expiry,\n };\n this.evict(true);\n }\n\n item = this.items[key] = {\n expiry: this.ttl > 0 ? Date.now() + this.ttl : this.ttl,\n key: key,\n prev: this.last,\n next: null,\n value,\n };\n\n if (++this.size === 1) {\n this.first = item;\n } else {\n this.last.next = item;\n }\n\n this.last = item;\n }\n\n return evicted;\n }\n\n /**\n * Sets a value in the cache. Updates the item's position to most recently used.\n *\n * @method set\n * @memberof LRU\n * @param {string} key - The key to set.\n * @param {*} value - The value to store.\n * @param {boolean} [bypass=false] - Internal parameter for setWithEvicted method.\n * @param {boolean} [resetTtl=this.resetTtl] - Whether to reset the TTL for this operation.\n * @returns {LRU} The LRU instance for method chaining.\n * @example\n * cache.set('key1', 'value1')\n * .set('key2', 'value2')\n * .set('key3', 'value3');\n * @see {@link LRU#get}\n * @see {@link LRU#setWithEvicted}\n * @since 1.0.0\n */\n set(key, value, bypass = false, resetTtl = this.resetTtl) {\n let item = this.items[key];\n\n if (bypass || item !== undefined) {\n // Existing item: update value and position\n item.value = value;\n\n if (bypass === false && resetTtl) {\n item.expiry = this.ttl > 0 ? Date.now() + this.ttl : this.ttl;\n }\n\n // Always move to end, but the bypass parameter affects TTL reset behavior\n this.moveToEnd(item);\n } else {\n // New item: check for eviction and create\n if (this.max > 0 && this.size === this.max) {\n this.evict(true);\n }\n\n item = this.items[key] = {\n expiry: this.ttl > 0 ? Date.now() + this.ttl : this.ttl,\n key: key,\n prev: this.last,\n next: null,\n value,\n };\n\n if (++this.size === 1) {\n this.first = item;\n } else {\n this.last.next = item;\n }\n\n this.last = item;\n }\n\n return this;\n }\n\n /**\n * Returns an array of all values in the cache for the specified keys.\n * Order follows LRU order (least to most recently used).\n *\n * @method values\n * @memberof LRU\n * @param {string[]} [keys=this.keys()] - Array of keys to get values for. Defaults to all keys.\n * @returns {Array<*>} Array of values corresponding to the keys in LRU order.\n * @example\n * cache.set('a', 1).set('b', 2);\n * console.log(cache.values()); // [1, 2]\n * console.log(cache.values(['a'])); // [1]\n * @see {@link LRU#keys}\n * @see {@link LRU#entries}\n * @since 11.1.0\n */\n values(keys) {\n if (keys === undefined) {\n keys = this.keys();\n }\n\n const result = Array.from({ length: keys.length });\n for (let i = 0; i < keys.length; i++) {\n const item = this.items[keys[i]];\n result[i] = item !== undefined ? item.value : undefined;\n }\n\n return result;\n }\n}\n\n/**\n * Factory function to create a new LRU cache instance with parameter validation.\n *\n * @function lru\n * @param {number} [max=1000] - Maximum number of items to store. Must be >= 0. Use 0 for unlimited size.\n * @param {number} [ttl=0] - Time to live in milliseconds. Must be >= 0. Use 0 for no expiration.\n * @param {boolean} [resetTtl=false] - Whether to reset TTL when accessing existing items via get().\n * @returns {LRU} A new LRU cache instance.\n * @throws {TypeError} When parameters are invalid (negative numbers or wrong types).\n * @example\n * // Create cache with factory function\n * const cache = lru(100, 5000, true);\n * cache.set('key', 'value');\n *\n * @example\n * // Error handling\n * try {\n * const cache = lru(-1); // Invalid max\n * } catch (error) {\n * console.error(error.message); // \"Invalid max value\"\n * }\n * @see {@link LRU}\n * @since 1.0.0\n */\nexport function lru(max = 1000, ttl = 0, resetTtl = false) {\n if (isNaN(max) || max < 0) {\n throw new TypeError(\"Invalid max value\");\n }\n\n if (isNaN(ttl) || ttl < 0) {\n throw new TypeError(\"Invalid ttl value\");\n }\n\n if (typeof resetTtl !== \"boolean\") {\n throw new TypeError(\"Invalid resetTtl value\");\n }\n\n return new LRU(max, ttl, 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\ No newline at end of file diff --git a/dist/tiny-lru.umd.js b/dist/tiny-lru.umd.js index d2efcfa..6d40874 100644 --- a/dist/tiny-lru.umd.js +++ b/dist/tiny-lru.umd.js @@ -24,443 +24,443 @@ * // After 5 seconds, key1 will be expired */ class LRU { - /** - * Creates a new LRU cache instance. - * Note: Constructor does not validate parameters. Use lru() factory function for parameter validation. - * - * @constructor - * @param {number} [max=0] - Maximum number of items to store. 0 means unlimited. - * @param {number} [ttl=0] - Time to live in milliseconds. 0 means no expiration. - * @param {boolean} [resetTtl=false] - Whether to reset TTL when accessing existing items via get(). - * @example - * const cache = new LRU(1000, 60000, true); // 1000 items, 1 minute TTL, reset on access - * @see {@link lru} For parameter validation - * @since 1.0.0 - */ - constructor (max = 0, ttl = 0, resetTtl = false) { - this.first = null; - this.items = Object.create(null); - this.last = null; - this.max = max; - this.resetTtl = resetTtl; - this.size = 0; - this.ttl = ttl; - } - - /** - * Removes all items from the cache. - * - * @method clear - * @memberof LRU - * @returns {LRU} The LRU instance for method chaining. - * @example - * cache.clear(); - * console.log(cache.size); // 0 - * @since 1.0.0 - */ - clear () { - this.first = null; - this.items = Object.create(null); - this.last = null; - this.size = 0; - - return this; - } - - /** - * Removes an item from the cache by key. - * - * @method delete - * @memberof LRU - * @param {string} key - The key of the item to delete. - * @returns {LRU} The LRU instance for method chaining. - * @example - * cache.set('key1', 'value1'); - * cache.delete('key1'); - * console.log(cache.has('key1')); // false - * @see {@link LRU#has} - * @see {@link LRU#clear} - * @since 1.0.0 - */ - delete (key) { - const item = this.items[key]; - - if (item !== undefined) { - delete this.items[key]; - this.size--; - - if (item.prev !== null) { - item.prev.next = item.next; - } - - if (item.next !== null) { - item.next.prev = item.prev; - } - - if (this.first === item) { - this.first = item.next; - } - - if (this.last === item) { - this.last = item.prev; - } - - item.prev = null; - item.next = null; - } - - return this; - } - - /** - * Returns an array of [key, value] pairs for the specified keys. - * Order follows LRU order (least to most recently used). - * - * @method entries - * @memberof LRU - * @param {string[]} [keys=this.keys()] - Array of keys to get entries for. Defaults to all keys. - * @returns {Array>} Array of [key, value] pairs in LRU order. - * @example - * cache.set('a', 1).set('b', 2); - * console.log(cache.entries()); // [['a', 1], ['b', 2]] - * console.log(cache.entries(['a'])); // [['a', 1]] - * @see {@link LRU#keys} - * @see {@link LRU#values} - * @since 11.1.0 - */ - entries (keys) { - if (keys === undefined) { - keys = this.keys(); - } - - const result = Array.from({ length: keys.length }); - for (let i = 0; i < keys.length; i++) { - const key = keys[i]; - const item = this.items[key]; - result[i] = [key, item !== undefined ? item.value : undefined]; - } - - return result; - } - - /** - * Removes the least recently used item from the cache. - * - * @method evict - * @memberof LRU - * @param {boolean} [bypass=false] - Whether to force eviction even when cache is empty. - * @returns {LRU} The LRU instance for method chaining. - * @example - * cache.set('old', 'value').set('new', 'value'); - * cache.evict(); // Removes 'old' item - * @see {@link LRU#setWithEvicted} - * @since 1.0.0 - */ - evict (bypass = false) { - if (bypass || this.size > 0) { - const item = this.first; - - if (!item) { - return this; - } - - delete this.items[item.key]; - - if (--this.size === 0) { - this.first = null; - this.last = null; - } else { - this.first = item.next; - this.first.prev = null; - } - - item.next = null; - } - - return this; - } - - /** - * Returns the expiration timestamp for a given key. - * - * @method expiresAt - * @memberof LRU - * @param {string} key - The key to check expiration for. - * @returns {number|undefined} The expiration timestamp in milliseconds, or undefined if key doesn't exist. - * @example - * const cache = new LRU(100, 5000); // 5 second TTL - * cache.set('key1', 'value1'); - * console.log(cache.expiresAt('key1')); // timestamp 5 seconds from now - * @see {@link LRU#get} - * @see {@link LRU#has} - * @since 1.0.0 - */ - expiresAt (key) { - const item = this.items[key]; - return item !== undefined ? item.expiry : undefined; - } - - /** - * Retrieves a value from the cache by key. Updates the item's position to most recently used. - * - * @method get - * @memberof LRU - * @param {string} key - The key to retrieve. - * @returns {*} The value associated with the key, or undefined if not found or expired. - * @example - * cache.set('key1', 'value1'); - * console.log(cache.get('key1')); // 'value1' - * console.log(cache.get('nonexistent')); // undefined - * @see {@link LRU#set} - * @see {@link LRU#has} - * @since 1.0.0 - */ - get (key) { - const item = this.items[key]; - - if (item !== undefined) { - // Check TTL only if enabled to avoid unnecessary Date.now() calls - if (this.ttl > 0) { - if (item.expiry <= Date.now()) { - this.delete(key); - - return undefined; - } - } - - // Fast LRU update without full set() overhead - this.moveToEnd(item); - - return item.value; - } - - return undefined; - } - - /** - * Checks if a key exists in the cache. - * - * @method has - * @memberof LRU - * @param {string} key - The key to check for. - * @returns {boolean} True if the key exists, false otherwise. - * @example - * cache.set('key1', 'value1'); - * console.log(cache.has('key1')); // true - * console.log(cache.has('nonexistent')); // false - * @see {@link LRU#get} - * @see {@link LRU#delete} - * @since 9.0.0 - */ - has (key) { - const item = this.items[key]; - return item !== undefined && (this.ttl === 0 || item.expiry > Date.now()); - } - - /** - * Efficiently moves an item to the end of the LRU list (most recently used position). - * This is an internal optimization method that avoids the overhead of the full set() operation - * when only LRU position needs to be updated. - * - * @method moveToEnd - * @memberof LRU - * @param {Object} item - The cache item with prev/next pointers to reposition. - * @private - * @since 11.3.5 - */ - moveToEnd (item) { - if (this.last === item) { - return; - } - - if (item.prev !== null) { - item.prev.next = item.next; - } - - if (item.next !== null) { - item.next.prev = item.prev; - } - - if (this.first === item) { - this.first = item.next; - } - - item.prev = this.last; - item.next = null; - this.last.next = item; - this.last = item; - } - - /** - * Returns an array of all keys in the cache, ordered from least to most recently used. - * - * @method keys - * @memberof LRU - * @returns {string[]} Array of keys in LRU order. - * @example - * cache.set('a', 1).set('b', 2); - * cache.get('a'); // Move 'a' to most recent - * console.log(cache.keys()); // ['b', 'a'] - * @see {@link LRU#values} - * @see {@link LRU#entries} - * @since 9.0.0 - */ - keys () { - const result = Array.from({ length: this.size }); - let x = this.first; - let i = 0; - - while (x !== null) { - result[i++] = x.key; - x = x.next; - } - - return result; - } - - /** - * Sets a value in the cache and returns any evicted item. - * - * @method setWithEvicted - * @memberof LRU - * @param {string} key - The key to set. - * @param {*} value - The value to store. - * @param {boolean} [resetTtl=this.resetTtl] - Whether to reset the TTL for this operation. - * @returns {Object|null} The evicted item (if any) with shape {key, value, expiry, prev, next}, or null. - * @example - * const cache = new LRU(2); - * cache.set('a', 1).set('b', 2); - * const evicted = cache.setWithEvicted('c', 3); // evicted = {key: 'a', value: 1, ...} - * @see {@link LRU#set} - * @see {@link LRU#evict} - * @since 11.3.0 - */ - setWithEvicted (key, value, resetTtl = this.resetTtl) { - let evicted = null; - let item = this.items[key]; - - if (item !== undefined) { - item.value = value; - if (resetTtl) { - item.expiry = this.ttl > 0 ? Date.now() + this.ttl : this.ttl; - } - this.moveToEnd(item); - } else { - if (this.max > 0 && this.size === this.max) { - evicted = { - key: this.first.key, - value: this.first.value, - expiry: this.first.expiry - }; - this.evict(true); - } - - item = this.items[key] = { - expiry: this.ttl > 0 ? Date.now() + this.ttl : this.ttl, - key: key, - prev: this.last, - next: null, - value - }; - - if (++this.size === 1) { - this.first = item; - } else { - this.last.next = item; - } - - this.last = item; - } - - return evicted; - } - - /** - * Sets a value in the cache. Updates the item's position to most recently used. - * - * @method set - * @memberof LRU - * @param {string} key - The key to set. - * @param {*} value - The value to store. - * @param {boolean} [bypass=false] - Internal parameter for setWithEvicted method. - * @param {boolean} [resetTtl=this.resetTtl] - Whether to reset the TTL for this operation. - * @returns {LRU} The LRU instance for method chaining. - * @example - * cache.set('key1', 'value1') - * .set('key2', 'value2') - * .set('key3', 'value3'); - * @see {@link LRU#get} - * @see {@link LRU#setWithEvicted} - * @since 1.0.0 - */ - set (key, value, bypass = false, resetTtl = this.resetTtl) { - let item = this.items[key]; - - if (bypass || item !== undefined) { - // Existing item: update value and position - item.value = value; - - if (bypass === false && resetTtl) { - item.expiry = this.ttl > 0 ? Date.now() + this.ttl : this.ttl; - } - - // Always move to end, but the bypass parameter affects TTL reset behavior - this.moveToEnd(item); - } else { - // New item: check for eviction and create - if (this.max > 0 && this.size === this.max) { - this.evict(true); - } - - item = this.items[key] = { - expiry: this.ttl > 0 ? Date.now() + this.ttl : this.ttl, - key: key, - prev: this.last, - next: null, - value - }; - - if (++this.size === 1) { - this.first = item; - } else { - this.last.next = item; - } - - this.last = item; - } - - return this; - } - - /** - * Returns an array of all values in the cache for the specified keys. - * Order follows LRU order (least to most recently used). - * - * @method values - * @memberof LRU - * @param {string[]} [keys=this.keys()] - Array of keys to get values for. Defaults to all keys. - * @returns {Array<*>} Array of values corresponding to the keys in LRU order. - * @example - * cache.set('a', 1).set('b', 2); - * console.log(cache.values()); // [1, 2] - * console.log(cache.values(['a'])); // [1] - * @see {@link LRU#keys} - * @see {@link LRU#entries} - * @since 11.1.0 - */ - values (keys) { - if (keys === undefined) { - keys = this.keys(); - } - - const result = Array.from({ length: keys.length }); - for (let i = 0; i < keys.length; i++) { - const item = this.items[keys[i]]; - result[i] = item !== undefined ? item.value : undefined; - } - - return result; - } + /** + * Creates a new LRU cache instance. + * Note: Constructor does not validate parameters. Use lru() factory function for parameter validation. + * + * @constructor + * @param {number} [max=0] - Maximum number of items to store. 0 means unlimited. + * @param {number} [ttl=0] - Time to live in milliseconds. 0 means no expiration. + * @param {boolean} [resetTtl=false] - Whether to reset TTL when accessing existing items via get(). + * @example + * const cache = new LRU(1000, 60000, true); // 1000 items, 1 minute TTL, reset on access + * @see {@link lru} For parameter validation + * @since 1.0.0 + */ + constructor(max = 0, ttl = 0, resetTtl = false) { + this.first = null; + this.items = Object.create(null); + this.last = null; + this.max = max; + this.resetTtl = resetTtl; + this.size = 0; + this.ttl = ttl; + } + + /** + * Removes all items from the cache. + * + * @method clear + * @memberof LRU + * @returns {LRU} The LRU instance for method chaining. + * @example + * cache.clear(); + * console.log(cache.size); // 0 + * @since 1.0.0 + */ + clear() { + this.first = null; + this.items = Object.create(null); + this.last = null; + this.size = 0; + + return this; + } + + /** + * Removes an item from the cache by key. + * + * @method delete + * @memberof LRU + * @param {string} key - The key of the item to delete. + * @returns {LRU} The LRU instance for method chaining. + * @example + * cache.set('key1', 'value1'); + * cache.delete('key1'); + * console.log(cache.has('key1')); // false + * @see {@link LRU#has} + * @see {@link LRU#clear} + * @since 1.0.0 + */ + delete(key) { + const item = this.items[key]; + + if (item !== undefined) { + delete this.items[key]; + this.size--; + + if (item.prev !== null) { + item.prev.next = item.next; + } + + if (item.next !== null) { + item.next.prev = item.prev; + } + + if (this.first === item) { + this.first = item.next; + } + + if (this.last === item) { + this.last = item.prev; + } + + item.prev = null; + item.next = null; + } + + return this; + } + + /** + * Returns an array of [key, value] pairs for the specified keys. + * Order follows LRU order (least to most recently used). + * + * @method entries + * @memberof LRU + * @param {string[]} [keys=this.keys()] - Array of keys to get entries for. Defaults to all keys. + * @returns {Array>} Array of [key, value] pairs in LRU order. + * @example + * cache.set('a', 1).set('b', 2); + * console.log(cache.entries()); // [['a', 1], ['b', 2]] + * console.log(cache.entries(['a'])); // [['a', 1]] + * @see {@link LRU#keys} + * @see {@link LRU#values} + * @since 11.1.0 + */ + entries(keys) { + if (keys === undefined) { + keys = this.keys(); + } + + const result = Array.from({ length: keys.length }); + for (let i = 0; i < keys.length; i++) { + const key = keys[i]; + const item = this.items[key]; + result[i] = [key, item !== undefined ? item.value : undefined]; + } + + return result; + } + + /** + * Removes the least recently used item from the cache. + * + * @method evict + * @memberof LRU + * @param {boolean} [bypass=false] - Whether to force eviction even when cache is empty. + * @returns {LRU} The LRU instance for method chaining. + * @example + * cache.set('old', 'value').set('new', 'value'); + * cache.evict(); // Removes 'old' item + * @see {@link LRU#setWithEvicted} + * @since 1.0.0 + */ + evict(bypass = false) { + if (bypass || this.size > 0) { + const item = this.first; + + if (!item) { + return this; + } + + delete this.items[item.key]; + + if (--this.size === 0) { + this.first = null; + this.last = null; + } else { + this.first = item.next; + this.first.prev = null; + } + + item.next = null; + } + + return this; + } + + /** + * Returns the expiration timestamp for a given key. + * + * @method expiresAt + * @memberof LRU + * @param {string} key - The key to check expiration for. + * @returns {number|undefined} The expiration timestamp in milliseconds, or undefined if key doesn't exist. + * @example + * const cache = new LRU(100, 5000); // 5 second TTL + * cache.set('key1', 'value1'); + * console.log(cache.expiresAt('key1')); // timestamp 5 seconds from now + * @see {@link LRU#get} + * @see {@link LRU#has} + * @since 1.0.0 + */ + expiresAt(key) { + const item = this.items[key]; + return item !== undefined ? item.expiry : undefined; + } + + /** + * Retrieves a value from the cache by key. Updates the item's position to most recently used. + * + * @method get + * @memberof LRU + * @param {string} key - The key to retrieve. + * @returns {*} The value associated with the key, or undefined if not found or expired. + * @example + * cache.set('key1', 'value1'); + * console.log(cache.get('key1')); // 'value1' + * console.log(cache.get('nonexistent')); // undefined + * @see {@link LRU#set} + * @see {@link LRU#has} + * @since 1.0.0 + */ + get(key) { + const item = this.items[key]; + + if (item !== undefined) { + // Check TTL only if enabled to avoid unnecessary Date.now() calls + if (this.ttl > 0) { + if (item.expiry <= Date.now()) { + this.delete(key); + + return undefined; + } + } + + // Fast LRU update without full set() overhead + this.moveToEnd(item); + + return item.value; + } + + return undefined; + } + + /** + * Checks if a key exists in the cache. + * + * @method has + * @memberof LRU + * @param {string} key - The key to check for. + * @returns {boolean} True if the key exists, false otherwise. + * @example + * cache.set('key1', 'value1'); + * console.log(cache.has('key1')); // true + * console.log(cache.has('nonexistent')); // false + * @see {@link LRU#get} + * @see {@link LRU#delete} + * @since 9.0.0 + */ + has(key) { + const item = this.items[key]; + return item !== undefined && (this.ttl === 0 || item.expiry > Date.now()); + } + + /** + * Efficiently moves an item to the end of the LRU list (most recently used position). + * This is an internal optimization method that avoids the overhead of the full set() operation + * when only LRU position needs to be updated. + * + * @method moveToEnd + * @memberof LRU + * @param {Object} item - The cache item with prev/next pointers to reposition. + * @private + * @since 11.3.5 + */ + moveToEnd(item) { + if (this.last === item) { + return; + } + + if (item.prev !== null) { + item.prev.next = item.next; + } + + if (item.next !== null) { + item.next.prev = item.prev; + } + + if (this.first === item) { + this.first = item.next; + } + + item.prev = this.last; + item.next = null; + this.last.next = item; + this.last = item; + } + + /** + * Returns an array of all keys in the cache, ordered from least to most recently used. + * + * @method keys + * @memberof LRU + * @returns {string[]} Array of keys in LRU order. + * @example + * cache.set('a', 1).set('b', 2); + * cache.get('a'); // Move 'a' to most recent + * console.log(cache.keys()); // ['b', 'a'] + * @see {@link LRU#values} + * @see {@link LRU#entries} + * @since 9.0.0 + */ + keys() { + const result = Array.from({ length: this.size }); + let x = this.first; + let i = 0; + + while (x !== null) { + result[i++] = x.key; + x = x.next; + } + + return result; + } + + /** + * Sets a value in the cache and returns any evicted item. + * + * @method setWithEvicted + * @memberof LRU + * @param {string} key - The key to set. + * @param {*} value - The value to store. + * @param {boolean} [resetTtl=this.resetTtl] - Whether to reset the TTL for this operation. + * @returns {Object|null} The evicted item (if any) with shape {key, value, expiry, prev, next}, or null. + * @example + * const cache = new LRU(2); + * cache.set('a', 1).set('b', 2); + * const evicted = cache.setWithEvicted('c', 3); // evicted = {key: 'a', value: 1, ...} + * @see {@link LRU#set} + * @see {@link LRU#evict} + * @since 11.3.0 + */ + setWithEvicted(key, value, resetTtl = this.resetTtl) { + let evicted = null; + let item = this.items[key]; + + if (item !== undefined) { + item.value = value; + if (resetTtl) { + item.expiry = this.ttl > 0 ? Date.now() + this.ttl : this.ttl; + } + this.moveToEnd(item); + } else { + if (this.max > 0 && this.size === this.max) { + evicted = { + key: this.first.key, + value: this.first.value, + expiry: this.first.expiry, + }; + this.evict(true); + } + + item = this.items[key] = { + expiry: this.ttl > 0 ? Date.now() + this.ttl : this.ttl, + key: key, + prev: this.last, + next: null, + value, + }; + + if (++this.size === 1) { + this.first = item; + } else { + this.last.next = item; + } + + this.last = item; + } + + return evicted; + } + + /** + * Sets a value in the cache. Updates the item's position to most recently used. + * + * @method set + * @memberof LRU + * @param {string} key - The key to set. + * @param {*} value - The value to store. + * @param {boolean} [bypass=false] - Internal parameter for setWithEvicted method. + * @param {boolean} [resetTtl=this.resetTtl] - Whether to reset the TTL for this operation. + * @returns {LRU} The LRU instance for method chaining. + * @example + * cache.set('key1', 'value1') + * .set('key2', 'value2') + * .set('key3', 'value3'); + * @see {@link LRU#get} + * @see {@link LRU#setWithEvicted} + * @since 1.0.0 + */ + set(key, value, bypass = false, resetTtl = this.resetTtl) { + let item = this.items[key]; + + if (bypass || item !== undefined) { + // Existing item: update value and position + item.value = value; + + if (bypass === false && resetTtl) { + item.expiry = this.ttl > 0 ? Date.now() + this.ttl : this.ttl; + } + + // Always move to end, but the bypass parameter affects TTL reset behavior + this.moveToEnd(item); + } else { + // New item: check for eviction and create + if (this.max > 0 && this.size === this.max) { + this.evict(true); + } + + item = this.items[key] = { + expiry: this.ttl > 0 ? Date.now() + this.ttl : this.ttl, + key: key, + prev: this.last, + next: null, + value, + }; + + if (++this.size === 1) { + this.first = item; + } else { + this.last.next = item; + } + + this.last = item; + } + + return this; + } + + /** + * Returns an array of all values in the cache for the specified keys. + * Order follows LRU order (least to most recently used). + * + * @method values + * @memberof LRU + * @param {string[]} [keys=this.keys()] - Array of keys to get values for. Defaults to all keys. + * @returns {Array<*>} Array of values corresponding to the keys in LRU order. + * @example + * cache.set('a', 1).set('b', 2); + * console.log(cache.values()); // [1, 2] + * console.log(cache.values(['a'])); // [1] + * @see {@link LRU#keys} + * @see {@link LRU#entries} + * @since 11.1.0 + */ + values(keys) { + if (keys === undefined) { + keys = this.keys(); + } + + const result = Array.from({ length: keys.length }); + for (let i = 0; i < keys.length; i++) { + const item = this.items[keys[i]]; + result[i] = item !== undefined ? item.value : undefined; + } + + return result; + } } /** @@ -487,18 +487,18 @@ class LRU { * @see {@link LRU} * @since 1.0.0 */ -function lru (max = 1000, ttl = 0, resetTtl = false) { - if (isNaN(max) || max < 0) { - throw new TypeError("Invalid max value"); - } +function lru(max = 1000, ttl = 0, resetTtl = false) { + if (isNaN(max) || max < 0) { + throw new TypeError("Invalid max value"); + } - if (isNaN(ttl) || ttl < 0) { - throw new TypeError("Invalid ttl value"); - } + if (isNaN(ttl) || ttl < 0) { + throw new TypeError("Invalid ttl value"); + } - if (typeof resetTtl !== "boolean") { - throw new TypeError("Invalid resetTtl value"); - } + if (typeof resetTtl !== "boolean") { + throw new TypeError("Invalid resetTtl value"); + } - return new LRU(max, ttl, resetTtl); + return new LRU(max, ttl, resetTtl); }exports.LRU=LRU;exports.lru=lru;})); \ No newline at end of file diff --git a/dist/tiny-lru.umd.min.js.map b/dist/tiny-lru.umd.min.js.map index d486cb7..26ed482 100644 --- a/dist/tiny-lru.umd.min.js.map +++ b/dist/tiny-lru.umd.min.js.map @@ -1 +1 @@ -{"version":3,"file":"tiny-lru.umd.min.js","sources":["../src/lru.js"],"sourcesContent":["/**\n * A high-performance Least Recently Used (LRU) cache implementation with optional TTL support.\n * Items are automatically evicted when the cache reaches its maximum size,\n * removing the least recently used items first. All core operations (get, set, delete) are O(1).\n *\n * @class LRU\n * @example\n * // Create a cache with max 100 items\n * const cache = new LRU(100);\n * cache.set('key1', 'value1');\n * console.log(cache.get('key1')); // 'value1'\n *\n * @example\n * // Create a cache with TTL\n * const cache = new LRU(100, 5000); // 5 second TTL\n * cache.set('key1', 'value1');\n * // After 5 seconds, key1 will be expired\n */\nexport class LRU {\n\t/**\n\t * Creates a new LRU cache instance.\n\t * Note: Constructor does not validate parameters. Use lru() factory function for parameter validation.\n\t *\n\t * @constructor\n\t * @param {number} [max=0] - Maximum number of items to store. 0 means unlimited.\n\t * @param {number} [ttl=0] - Time to live in milliseconds. 0 means no expiration.\n\t * @param {boolean} [resetTtl=false] - Whether to reset TTL when accessing existing items via get().\n\t * @example\n\t * const cache = new LRU(1000, 60000, true); // 1000 items, 1 minute TTL, reset on access\n\t * @see {@link lru} For parameter validation\n\t * @since 1.0.0\n\t */\n\tconstructor (max = 0, ttl = 0, resetTtl = false) {\n\t\tthis.first = null;\n\t\tthis.items = Object.create(null);\n\t\tthis.last = null;\n\t\tthis.max = max;\n\t\tthis.resetTtl = resetTtl;\n\t\tthis.size = 0;\n\t\tthis.ttl = ttl;\n\t}\n\n\t/**\n\t * Removes all items from the cache.\n\t *\n\t * @method clear\n\t * @memberof LRU\n\t * @returns {LRU} The LRU instance for method chaining.\n\t * @example\n\t * cache.clear();\n\t * console.log(cache.size); // 0\n\t * @since 1.0.0\n\t */\n\tclear () {\n\t\tthis.first = null;\n\t\tthis.items = Object.create(null);\n\t\tthis.last = null;\n\t\tthis.size = 0;\n\n\t\treturn this;\n\t}\n\n\t/**\n\t * Removes an item from the cache by key.\n\t *\n\t * @method delete\n\t * @memberof LRU\n\t * @param {string} key - The key of the item to delete.\n\t * @returns {LRU} The LRU instance for method chaining.\n\t * @example\n\t * cache.set('key1', 'value1');\n\t * cache.delete('key1');\n\t * console.log(cache.has('key1')); // false\n\t * @see {@link LRU#has}\n\t * @see {@link LRU#clear}\n\t * @since 1.0.0\n\t */\n\tdelete (key) {\n\t\tconst item = this.items[key];\n\n\t\tif (item !== undefined) {\n\t\t\tdelete this.items[key];\n\t\t\tthis.size--;\n\n\t\t\tif (item.prev !== null) {\n\t\t\t\titem.prev.next = item.next;\n\t\t\t}\n\n\t\t\tif (item.next !== null) {\n\t\t\t\titem.next.prev = item.prev;\n\t\t\t}\n\n\t\t\tif (this.first === item) {\n\t\t\t\tthis.first = item.next;\n\t\t\t}\n\n\t\t\tif (this.last === item) {\n\t\t\t\tthis.last = item.prev;\n\t\t\t}\n\n\t\t\titem.prev = null;\n\t\t\titem.next = null;\n\t\t}\n\n\t\treturn this;\n\t}\n\n\t/**\n\t * Returns an array of [key, value] pairs for the specified keys.\n\t * Order follows LRU order (least to most recently used).\n\t *\n\t * @method entries\n\t * @memberof LRU\n\t * @param {string[]} [keys=this.keys()] - Array of keys to get entries for. Defaults to all keys.\n\t * @returns {Array>} Array of [key, value] pairs in LRU order.\n\t * @example\n\t * cache.set('a', 1).set('b', 2);\n\t * console.log(cache.entries()); // [['a', 1], ['b', 2]]\n\t * console.log(cache.entries(['a'])); // [['a', 1]]\n\t * @see {@link LRU#keys}\n\t * @see {@link LRU#values}\n\t * @since 11.1.0\n\t */\n\tentries (keys) {\n\t\tif (keys === undefined) {\n\t\t\tkeys = this.keys();\n\t\t}\n\n\t\tconst result = Array.from({ length: keys.length });\n\t\tfor (let i = 0; i < keys.length; i++) {\n\t\t\tconst key = keys[i];\n\t\t\tconst item = this.items[key];\n\t\t\tresult[i] = [key, item !== undefined ? item.value : undefined];\n\t\t}\n\n\t\treturn result;\n\t}\n\n\t/**\n\t * Removes the least recently used item from the cache.\n\t *\n\t * @method evict\n\t * @memberof LRU\n\t * @param {boolean} [bypass=false] - Whether to force eviction even when cache is empty.\n\t * @returns {LRU} The LRU instance for method chaining.\n\t * @example\n\t * cache.set('old', 'value').set('new', 'value');\n\t * cache.evict(); // Removes 'old' item\n\t * @see {@link LRU#setWithEvicted}\n\t * @since 1.0.0\n\t */\n\tevict (bypass = false) {\n\t\tif (bypass || this.size > 0) {\n\t\t\tconst item = this.first;\n\n\t\t\tif (!item) {\n\t\t\t\treturn this;\n\t\t\t}\n\n\t\t\tdelete this.items[item.key];\n\n\t\t\tif (--this.size === 0) {\n\t\t\t\tthis.first = null;\n\t\t\t\tthis.last = null;\n\t\t\t} else {\n\t\t\t\tthis.first = item.next;\n\t\t\t\tthis.first.prev = null;\n\t\t\t}\n\n\t\t\titem.next = null;\n\t\t}\n\n\t\treturn this;\n\t}\n\n\t/**\n\t * Returns the expiration timestamp for a given key.\n\t *\n\t * @method expiresAt\n\t * @memberof LRU\n\t * @param {string} key - The key to check expiration for.\n\t * @returns {number|undefined} The expiration timestamp in milliseconds, or undefined if key doesn't exist.\n\t * @example\n\t * const cache = new LRU(100, 5000); // 5 second TTL\n\t * cache.set('key1', 'value1');\n\t * console.log(cache.expiresAt('key1')); // timestamp 5 seconds from now\n\t * @see {@link LRU#get}\n\t * @see {@link LRU#has}\n\t * @since 1.0.0\n\t */\n\texpiresAt (key) {\n\t\tconst item = this.items[key];\n\t\treturn item !== undefined ? item.expiry : undefined;\n\t}\n\n\t/**\n\t * Retrieves a value from the cache by key. Updates the item's position to most recently used.\n\t *\n\t * @method get\n\t * @memberof LRU\n\t * @param {string} key - The key to retrieve.\n\t * @returns {*} The value associated with the key, or undefined if not found or expired.\n\t * @example\n\t * cache.set('key1', 'value1');\n\t * console.log(cache.get('key1')); // 'value1'\n\t * console.log(cache.get('nonexistent')); // undefined\n\t * @see {@link LRU#set}\n\t * @see {@link LRU#has}\n\t * @since 1.0.0\n\t */\n\tget (key) {\n\t\tconst item = this.items[key];\n\n\t\tif (item !== undefined) {\n\t\t\t// Check TTL only if enabled to avoid unnecessary Date.now() calls\n\t\t\tif (this.ttl > 0) {\n\t\t\t\tif (item.expiry <= Date.now()) {\n\t\t\t\t\tthis.delete(key);\n\n\t\t\t\t\treturn undefined;\n\t\t\t\t}\n\t\t\t}\n\n\t\t\t// Fast LRU update without full set() overhead\n\t\t\tthis.moveToEnd(item);\n\n\t\t\treturn item.value;\n\t\t}\n\n\t\treturn undefined;\n\t}\n\n\t/**\n\t * Checks if a key exists in the cache.\n\t *\n\t * @method has\n\t * @memberof LRU\n\t * @param {string} key - The key to check for.\n\t * @returns {boolean} True if the key exists, false otherwise.\n\t * @example\n\t * cache.set('key1', 'value1');\n\t * console.log(cache.has('key1')); // true\n\t * console.log(cache.has('nonexistent')); // false\n\t * @see {@link LRU#get}\n\t * @see {@link LRU#delete}\n\t * @since 9.0.0\n\t */\n\thas (key) {\n\t\tconst item = this.items[key];\n\t\treturn item !== undefined && (this.ttl === 0 || item.expiry > Date.now());\n\t}\n\n\t/**\n\t * Efficiently moves an item to the end of the LRU list (most recently used position).\n\t * This is an internal optimization method that avoids the overhead of the full set() operation\n\t * when only LRU position needs to be updated.\n\t *\n\t * @method moveToEnd\n\t * @memberof LRU\n\t * @param {Object} item - The cache item with prev/next pointers to reposition.\n\t * @private\n\t * @since 11.3.5\n\t */\n\tmoveToEnd (item) {\n\t\tif (this.last === item) {\n\t\t\treturn;\n\t\t}\n\n\t\tif (item.prev !== null) {\n\t\t\titem.prev.next = item.next;\n\t\t}\n\n\t\tif (item.next !== null) {\n\t\t\titem.next.prev = item.prev;\n\t\t}\n\n\t\tif (this.first === item) {\n\t\t\tthis.first = item.next;\n\t\t}\n\n\t\titem.prev = this.last;\n\t\titem.next = null;\n\t\tthis.last.next = item;\n\t\tthis.last = item;\n\t}\n\n\t/**\n\t * Returns an array of all keys in the cache, ordered from least to most recently used.\n\t *\n\t * @method keys\n\t * @memberof LRU\n\t * @returns {string[]} Array of keys in LRU order.\n\t * @example\n\t * cache.set('a', 1).set('b', 2);\n\t * cache.get('a'); // Move 'a' to most recent\n\t * console.log(cache.keys()); // ['b', 'a']\n\t * @see {@link LRU#values}\n\t * @see {@link LRU#entries}\n\t * @since 9.0.0\n\t */\n\tkeys () {\n\t\tconst result = Array.from({ length: this.size });\n\t\tlet x = this.first;\n\t\tlet i = 0;\n\n\t\twhile (x !== null) {\n\t\t\tresult[i++] = x.key;\n\t\t\tx = x.next;\n\t\t}\n\n\t\treturn result;\n\t}\n\n\t/**\n\t * Sets a value in the cache and returns any evicted item.\n\t *\n\t * @method setWithEvicted\n\t * @memberof LRU\n\t * @param {string} key - The key to set.\n\t * @param {*} value - The value to store.\n\t * @param {boolean} [resetTtl=this.resetTtl] - Whether to reset the TTL for this operation.\n\t * @returns {Object|null} The evicted item (if any) with shape {key, value, expiry, prev, next}, or null.\n\t * @example\n\t * const cache = new LRU(2);\n\t * cache.set('a', 1).set('b', 2);\n\t * const evicted = cache.setWithEvicted('c', 3); // evicted = {key: 'a', value: 1, ...}\n\t * @see {@link LRU#set}\n\t * @see {@link LRU#evict}\n\t * @since 11.3.0\n\t */\n\tsetWithEvicted (key, value, resetTtl = this.resetTtl) {\n\t\tlet evicted = null;\n\t\tlet item = this.items[key];\n\n\t\tif (item !== undefined) {\n\t\t\titem.value = value;\n\t\t\tif (resetTtl) {\n\t\t\t\titem.expiry = this.ttl > 0 ? Date.now() + this.ttl : this.ttl;\n\t\t\t}\n\t\t\tthis.moveToEnd(item);\n\t\t} else {\n\t\t\tif (this.max > 0 && this.size === this.max) {\n\t\t\t\tevicted = {\n\t\t\t\t\tkey: this.first.key,\n\t\t\t\t\tvalue: this.first.value,\n\t\t\t\t\texpiry: this.first.expiry\n\t\t\t\t};\n\t\t\t\tthis.evict(true);\n\t\t\t}\n\n\t\t\titem = this.items[key] = {\n\t\t\t\texpiry: this.ttl > 0 ? Date.now() + this.ttl : this.ttl,\n\t\t\t\tkey: key,\n\t\t\t\tprev: this.last,\n\t\t\t\tnext: null,\n\t\t\t\tvalue\n\t\t\t};\n\n\t\t\tif (++this.size === 1) {\n\t\t\t\tthis.first = item;\n\t\t\t} else {\n\t\t\t\tthis.last.next = item;\n\t\t\t}\n\n\t\t\tthis.last = item;\n\t\t}\n\n\t\treturn evicted;\n\t}\n\n\t/**\n\t * Sets a value in the cache. 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Defaults to all keys.\n\t * @returns {Array<*>} Array of values corresponding to the keys in LRU order.\n\t * @example\n\t * cache.set('a', 1).set('b', 2);\n\t * console.log(cache.values()); // [1, 2]\n\t * console.log(cache.values(['a'])); // [1]\n\t * @see {@link LRU#keys}\n\t * @see {@link LRU#entries}\n\t * @since 11.1.0\n\t */\n\tvalues (keys) {\n\t\tif (keys === undefined) {\n\t\t\tkeys = this.keys();\n\t\t}\n\n\t\tconst result = Array.from({ length: keys.length });\n\t\tfor (let i = 0; i < keys.length; i++) {\n\t\t\tconst item = this.items[keys[i]];\n\t\t\tresult[i] = item !== undefined ? item.value : undefined;\n\t\t}\n\n\t\treturn result;\n\t}\n}\n\n/**\n * Factory function to create a new LRU cache instance with parameter validation.\n *\n * @function lru\n * @param {number} [max=1000] - Maximum number of items to store. Must be >= 0. Use 0 for unlimited size.\n * @param {number} [ttl=0] - Time to live in milliseconds. Must be >= 0. 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\ No newline at end of file +{"version":3,"file":"tiny-lru.umd.min.js","sources":["../src/lru.js"],"sourcesContent":["/**\n * A high-performance Least Recently Used (LRU) cache implementation with optional TTL support.\n * Items are automatically evicted when the cache reaches its maximum size,\n * removing the least recently used items first. All core operations (get, set, delete) are O(1).\n *\n * @class LRU\n * @example\n * // Create a cache with max 100 items\n * const cache = new LRU(100);\n * cache.set('key1', 'value1');\n * console.log(cache.get('key1')); // 'value1'\n *\n * @example\n * // Create a cache with TTL\n * const cache = new LRU(100, 5000); // 5 second TTL\n * cache.set('key1', 'value1');\n * // After 5 seconds, key1 will be expired\n */\nexport class LRU {\n /**\n * Creates a new LRU cache instance.\n * Note: Constructor does not validate parameters. Use lru() factory function for parameter validation.\n *\n * @constructor\n * @param {number} [max=0] - Maximum number of items to store. 0 means unlimited.\n * @param {number} [ttl=0] - Time to live in milliseconds. 0 means no expiration.\n * @param {boolean} [resetTtl=false] - Whether to reset TTL when accessing existing items via get().\n * @example\n * const cache = new LRU(1000, 60000, true); // 1000 items, 1 minute TTL, reset on access\n * @see {@link lru} For parameter validation\n * @since 1.0.0\n */\n constructor(max = 0, ttl = 0, resetTtl = false) {\n this.first = null;\n this.items = Object.create(null);\n this.last = null;\n this.max = max;\n this.resetTtl = resetTtl;\n this.size = 0;\n this.ttl = ttl;\n }\n\n /**\n * Removes all items from the cache.\n *\n * @method clear\n * @memberof LRU\n * @returns {LRU} The LRU instance for method chaining.\n * @example\n * cache.clear();\n * console.log(cache.size); // 0\n * @since 1.0.0\n */\n clear() {\n this.first = null;\n this.items = Object.create(null);\n this.last = null;\n this.size = 0;\n\n return this;\n }\n\n /**\n * Removes an item from the cache by key.\n *\n * @method delete\n * @memberof LRU\n * @param {string} key - The key of the item to delete.\n * @returns {LRU} The LRU instance for method chaining.\n * @example\n * cache.set('key1', 'value1');\n * cache.delete('key1');\n * console.log(cache.has('key1')); // false\n * @see {@link LRU#has}\n * @see {@link LRU#clear}\n * @since 1.0.0\n */\n delete(key) {\n const item = this.items[key];\n\n if (item !== undefined) {\n delete this.items[key];\n this.size--;\n\n if (item.prev !== null) {\n item.prev.next = item.next;\n }\n\n if (item.next !== null) {\n item.next.prev = item.prev;\n }\n\n if (this.first === item) {\n this.first = item.next;\n }\n\n if (this.last === item) {\n this.last = item.prev;\n }\n\n item.prev = null;\n item.next = null;\n }\n\n return this;\n }\n\n /**\n * Returns an array of [key, value] pairs for the specified keys.\n * Order follows LRU order (least to most recently used).\n *\n * @method entries\n * @memberof LRU\n * @param {string[]} [keys=this.keys()] - Array of keys to get entries for. Defaults to all keys.\n * @returns {Array>} Array of [key, value] pairs in LRU order.\n * @example\n * cache.set('a', 1).set('b', 2);\n * console.log(cache.entries()); // [['a', 1], ['b', 2]]\n * console.log(cache.entries(['a'])); // [['a', 1]]\n * @see {@link LRU#keys}\n * @see {@link LRU#values}\n * @since 11.1.0\n */\n entries(keys) {\n if (keys === undefined) {\n keys = this.keys();\n }\n\n const result = Array.from({ length: keys.length });\n for (let i = 0; i < keys.length; i++) {\n const key = keys[i];\n const item = this.items[key];\n result[i] = [key, item !== undefined ? item.value : undefined];\n }\n\n return result;\n }\n\n /**\n * Removes the least recently used item from the cache.\n *\n * @method evict\n * @memberof LRU\n * @param {boolean} [bypass=false] - Whether to force eviction even when cache is empty.\n * @returns {LRU} The LRU instance for method chaining.\n * @example\n * cache.set('old', 'value').set('new', 'value');\n * cache.evict(); // Removes 'old' item\n * @see {@link LRU#setWithEvicted}\n * @since 1.0.0\n */\n evict(bypass = false) {\n if (bypass || this.size > 0) {\n const item = this.first;\n\n if (!item) {\n return this;\n }\n\n delete this.items[item.key];\n\n if (--this.size === 0) {\n this.first = null;\n this.last = null;\n } else {\n this.first = item.next;\n this.first.prev = null;\n }\n\n item.next = null;\n }\n\n return this;\n }\n\n /**\n * Returns the expiration timestamp for a given key.\n *\n * @method expiresAt\n * @memberof LRU\n * @param {string} key - The key to check expiration for.\n * @returns {number|undefined} The expiration timestamp in milliseconds, or undefined if key doesn't exist.\n * @example\n * const cache = new LRU(100, 5000); // 5 second TTL\n * cache.set('key1', 'value1');\n * console.log(cache.expiresAt('key1')); // timestamp 5 seconds from now\n * @see {@link LRU#get}\n * @see {@link LRU#has}\n * @since 1.0.0\n */\n expiresAt(key) {\n const item = this.items[key];\n return item !== undefined ? item.expiry : undefined;\n }\n\n /**\n * Retrieves a value from the cache by key. Updates the item's position to most recently used.\n *\n * @method get\n * @memberof LRU\n * @param {string} key - The key to retrieve.\n * @returns {*} The value associated with the key, or undefined if not found or expired.\n * @example\n * cache.set('key1', 'value1');\n * console.log(cache.get('key1')); // 'value1'\n * console.log(cache.get('nonexistent')); // undefined\n * @see {@link LRU#set}\n * @see {@link LRU#has}\n * @since 1.0.0\n */\n get(key) {\n const item = this.items[key];\n\n if (item !== undefined) {\n // Check TTL only if enabled to avoid unnecessary Date.now() calls\n if (this.ttl > 0) {\n if (item.expiry <= Date.now()) {\n this.delete(key);\n\n return undefined;\n }\n }\n\n // Fast LRU update without full set() overhead\n this.moveToEnd(item);\n\n return item.value;\n }\n\n return undefined;\n }\n\n /**\n * Checks if a key exists in the cache.\n *\n * @method has\n * @memberof LRU\n * @param {string} key - The key to check for.\n * @returns {boolean} True if the key exists, false otherwise.\n * @example\n * cache.set('key1', 'value1');\n * console.log(cache.has('key1')); // true\n * console.log(cache.has('nonexistent')); // false\n * @see {@link LRU#get}\n * @see {@link LRU#delete}\n * @since 9.0.0\n */\n has(key) {\n const item = this.items[key];\n return item !== undefined && (this.ttl === 0 || item.expiry > Date.now());\n }\n\n /**\n * Efficiently moves an item to the end of the LRU list (most recently used position).\n * This is an internal optimization method that avoids the overhead of the full set() operation\n * when only LRU position needs to be updated.\n *\n * @method moveToEnd\n * @memberof LRU\n * @param {Object} item - The cache item with prev/next pointers to reposition.\n * @private\n * @since 11.3.5\n */\n moveToEnd(item) {\n if (this.last === item) {\n return;\n }\n\n if (item.prev !== null) {\n item.prev.next = item.next;\n }\n\n if (item.next !== null) {\n item.next.prev = item.prev;\n }\n\n if (this.first === item) {\n this.first = item.next;\n }\n\n item.prev = this.last;\n item.next = null;\n this.last.next = item;\n this.last = item;\n }\n\n /**\n * Returns an array of all keys in the cache, ordered from least to most recently used.\n *\n * @method keys\n * @memberof LRU\n * @returns {string[]} Array of keys in LRU order.\n * @example\n * cache.set('a', 1).set('b', 2);\n * cache.get('a'); // Move 'a' to most recent\n * console.log(cache.keys()); // ['b', 'a']\n * @see {@link LRU#values}\n * @see {@link LRU#entries}\n * @since 9.0.0\n */\n keys() {\n const result = Array.from({ length: this.size });\n let x = this.first;\n let i = 0;\n\n while (x !== null) {\n result[i++] = x.key;\n x = x.next;\n }\n\n return result;\n }\n\n /**\n * Sets a value in the cache and returns any evicted item.\n *\n * @method setWithEvicted\n * @memberof LRU\n * @param {string} key - The key to set.\n * @param {*} value - The value to store.\n * @param {boolean} [resetTtl=this.resetTtl] - Whether to reset the TTL for this operation.\n * @returns {Object|null} The evicted item (if any) with shape {key, value, expiry, prev, next}, or null.\n * @example\n * const cache = new LRU(2);\n * cache.set('a', 1).set('b', 2);\n * const evicted = cache.setWithEvicted('c', 3); // evicted = {key: 'a', value: 1, ...}\n * @see {@link LRU#set}\n * @see {@link LRU#evict}\n * @since 11.3.0\n */\n setWithEvicted(key, value, resetTtl = this.resetTtl) {\n let evicted = null;\n let item = this.items[key];\n\n if (item !== undefined) {\n item.value = value;\n if (resetTtl) {\n item.expiry = this.ttl > 0 ? Date.now() + this.ttl : this.ttl;\n }\n this.moveToEnd(item);\n } else {\n if (this.max > 0 && this.size === this.max) {\n evicted = {\n key: this.first.key,\n value: this.first.value,\n expiry: this.first.expiry,\n };\n this.evict(true);\n }\n\n item = this.items[key] = {\n expiry: this.ttl > 0 ? Date.now() + this.ttl : this.ttl,\n key: key,\n prev: this.last,\n next: null,\n value,\n };\n\n if (++this.size === 1) {\n this.first = item;\n } else {\n this.last.next = item;\n }\n\n this.last = item;\n }\n\n return evicted;\n }\n\n /**\n * Sets a value in the cache. Updates the item's position to most recently used.\n *\n * @method set\n * @memberof LRU\n * @param {string} key - The key to set.\n * @param {*} value - The value to store.\n * @param {boolean} [bypass=false] - Internal parameter for setWithEvicted method.\n * @param {boolean} [resetTtl=this.resetTtl] - Whether to reset the TTL for this operation.\n * @returns {LRU} The LRU instance for method chaining.\n * @example\n * cache.set('key1', 'value1')\n * .set('key2', 'value2')\n * .set('key3', 'value3');\n * @see {@link LRU#get}\n * @see {@link LRU#setWithEvicted}\n * @since 1.0.0\n */\n set(key, value, bypass = false, resetTtl = this.resetTtl) {\n let item = this.items[key];\n\n if (bypass || item !== undefined) {\n // Existing item: update value and position\n item.value = value;\n\n if (bypass === false && resetTtl) {\n item.expiry = this.ttl > 0 ? Date.now() + this.ttl : this.ttl;\n }\n\n // Always move to end, but the bypass parameter affects TTL reset behavior\n this.moveToEnd(item);\n } else {\n // New item: check for eviction and create\n if (this.max > 0 && this.size === this.max) {\n this.evict(true);\n }\n\n item = this.items[key] = {\n expiry: this.ttl > 0 ? Date.now() + this.ttl : this.ttl,\n key: key,\n prev: this.last,\n next: null,\n value,\n };\n\n if (++this.size === 1) {\n this.first = item;\n } else {\n this.last.next = item;\n }\n\n this.last = item;\n }\n\n return this;\n }\n\n /**\n * Returns an array of all values in the cache for the specified keys.\n * Order follows LRU order (least to most recently used).\n *\n * @method values\n * @memberof LRU\n * @param {string[]} [keys=this.keys()] - Array of keys to get values for. Defaults to all keys.\n * @returns {Array<*>} Array of values corresponding to the keys in LRU order.\n * @example\n * cache.set('a', 1).set('b', 2);\n * console.log(cache.values()); // [1, 2]\n * console.log(cache.values(['a'])); // [1]\n * @see {@link LRU#keys}\n * @see {@link LRU#entries}\n * @since 11.1.0\n */\n values(keys) {\n if (keys === undefined) {\n keys = this.keys();\n }\n\n const result = Array.from({ length: keys.length });\n for (let i = 0; i < keys.length; i++) {\n const item = this.items[keys[i]];\n result[i] = item !== undefined ? item.value : undefined;\n }\n\n return result;\n }\n}\n\n/**\n * Factory function to create a new LRU cache instance with parameter validation.\n *\n * @function lru\n * @param {number} [max=1000] - Maximum number of items to store. Must be >= 0. Use 0 for unlimited size.\n * @param {number} [ttl=0] - Time to live in milliseconds. Must be >= 0. 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\ No newline at end of file diff --git a/tests/unit/lru.js b/tests/unit/lru.js deleted file mode 100644 index ff34bd0..0000000 --- a/tests/unit/lru.js +++ /dev/null @@ -1,536 +0,0 @@ -import { LRU, lru } from "../../src/lru.js"; -import { describe, it, beforeEach } from "node:test"; -import assert from "node:assert"; - -describe("LRU Cache", function () { - describe("Constructor", function () { - it("should create an LRU instance with default parameters", function () { - const cache = new LRU(); - assert.equal(cache.max, 0); - assert.equal(cache.ttl, 0); - assert.equal(cache.resetTtl, false); - assert.equal(cache.size, 0); - assert.equal(cache.first, null); - assert.equal(cache.last, null); - assert.notEqual(cache.items, null); - assert.equal(typeof cache.items, "object"); - }); - - it("should create an LRU instance with custom parameters", function () { - const cache = new LRU(10, 5000, true); - assert.equal(cache.max, 10); - assert.equal(cache.ttl, 5000); - assert.equal(cache.resetTtl, true); - assert.equal(cache.size, 0); - }); - }); - - describe("lru factory function", function () { - it("should create an LRU instance with default parameters", function () { - const cache = lru(); - assert.equal(cache.max, 1000); - assert.equal(cache.ttl, 0); - assert.equal(cache.resetTtl, false); - }); - - it("should create an LRU instance with custom parameters", function () { - const cache = lru(50, 1000, true); - assert.equal(cache.max, 50); - assert.equal(cache.ttl, 1000); - assert.equal(cache.resetTtl, true); - }); - - it("should throw TypeError for invalid max value", function () { - assert.throws(() => lru("invalid"), TypeError, "Invalid max value"); - assert.throws(() => lru(-1), TypeError, "Invalid max value"); - assert.throws(() => lru(NaN), TypeError, "Invalid max value"); - }); - - it("should throw TypeError for invalid ttl value", function () { - assert.throws(() => lru(10, "invalid"), TypeError, "Invalid ttl value"); - assert.throws(() => lru(10, -1), TypeError, "Invalid ttl value"); - assert.throws(() => lru(10, NaN), TypeError, "Invalid ttl value"); - }); - - it("should throw TypeError for invalid resetTtl value", function () { - assert.throws(() => lru(10, 0, "invalid"), TypeError, "Invalid resetTtl value"); - assert.throws(() => lru(10, 0, 1), TypeError, "Invalid resetTtl value"); - }); - }); - - describe("Basic operations", function () { - let cache; - - beforeEach(function () { - cache = new LRU(3); - }); - - it("should set and get values", function () { - cache.set("key1", "value1"); - assert.equal(cache.get("key1"), "value1"); - assert.equal(cache.size, 1); - }); - - it("should return undefined for non-existent keys", function () { - assert.equal(cache.get("nonexistent"), undefined); - }); - - it("should check if key exists with has()", function () { - cache.set("key1", "value1"); - assert.equal(cache.has("key1"), true); - assert.equal(cache.has("nonexistent"), false); - }); - - it("should delete items", function () { - cache.set("key1", "value1"); - cache.set("key2", "value2"); - assert.equal(cache.size, 2); - - cache.delete("key1"); - assert.equal(cache.size, 1); - assert.equal(cache.has("key1"), false); - assert.equal(cache.get("key1"), undefined); - assert.equal(cache.get("key2"), "value2"); - }); - - it("should delete non-existent key gracefully", function () { - cache.set("key1", "value1"); - cache.delete("nonexistent"); - assert.equal(cache.size, 1); - assert.equal(cache.get("key1"), "value1"); - }); - - it("should clear all items", function () { - cache.set("key1", "value1"); - cache.set("key2", "value2"); - assert.equal(cache.size, 2); - - cache.clear(); - assert.equal(cache.size, 0); - assert.equal(cache.first, null); - assert.equal(cache.last, null); - assert.notEqual(cache.items, null); - assert.equal(typeof cache.items, "object"); - }); - - it("should support method chaining", function () { - const result = cache.set("key1", "value1").set("key2", "value2").clear(); - assert.equal(result, cache); - }); - }); - - describe("LRU eviction", function () { - let cache; - - beforeEach(function () { - cache = new LRU(3); - }); - - it("should evict least recently used item when max is reached", function () { - cache.set("key1", "value1"); - cache.set("key2", "value2"); - cache.set("key3", "value3"); - cache.set("key4", "value4"); - - assert.equal(cache.size, 3); - assert.equal(cache.has("key1"), false); - assert.equal(cache.has("key2"), true); - assert.equal(cache.has("key3"), true); - assert.equal(cache.has("key4"), true); - }); - - it("should update position when accessing existing item", function () { - cache.set("key1", "value1"); - cache.set("key2", "value2"); - cache.set("key3", "value3"); - - cache.get("key1"); - - cache.set("key4", "value4"); - - assert.equal(cache.has("key1"), true); - assert.equal(cache.has("key2"), false); - assert.equal(cache.has("key3"), true); - assert.equal(cache.has("key4"), true); - }); - - it("should maintain correct order in keys()", function () { - cache.set("key1", "value1"); - cache.set("key2", "value2"); - cache.set("key3", "value3"); - - let keys = cache.keys(); - assert.deepEqual(keys, ["key1", "key2", "key3"]); - - cache.get("key1"); - keys = cache.keys(); - assert.deepEqual(keys, ["key2", "key3", "key1"]); - }); - - it("should handle unlimited cache size (max = 0)", function () { - const unlimitedCache = new LRU(0); - for (let i = 0; i < 1000; i++) { - unlimitedCache.set(`key${i}`, `value${i}`); - } - assert.equal(unlimitedCache.size, 1000); - }); - }); - - describe("Eviction methods", function () { - let cache; - - beforeEach(function () { - cache = new LRU(3); - cache.set("key1", "value1"); - cache.set("key2", "value2"); - cache.set("key3", "value3"); - }); - - it("should evict first item with evict()", function () { - cache.evict(); - assert.equal(cache.size, 2); - assert.equal(cache.has("key1"), false); - assert.equal(cache.has("key2"), true); - assert.equal(cache.has("key3"), true); - }); - - it("should evict with bypass flag", function () { - cache.evict(true); - assert.equal(cache.size, 2); - }); - - it("should handle evict on empty cache", function () { - cache.clear(); - cache.evict(); - assert.equal(cache.size, 0); - }); - - it("should handle evict on single item cache", function () { - cache.clear(); - cache.set("only", "value"); - cache.evict(); - assert.equal(cache.size, 0); - assert.equal(cache.first, null); - assert.equal(cache.last, null); - }); - }); - - describe("setWithEvicted method", function () { - let cache; - - beforeEach(function () { - cache = new LRU(2); - }); - - it("should return null when no eviction occurs", function () { - const evicted = cache.setWithEvicted("key1", "value1"); - assert.equal(evicted, null); - }); - - it("should return evicted item when max is reached", function () { - cache.set("key1", "value1"); - cache.set("key2", "value2"); - - const evicted = cache.setWithEvicted("key3", "value3"); - assert.notEqual(evicted, null); - assert.equal(evicted.key, "key1"); - assert.equal(evicted.value, "value1"); - }); - - it("should update existing key without eviction", function () { - cache.set("key1", "value1"); - const evicted = cache.setWithEvicted("key1", "newvalue1"); - assert.equal(evicted, null); - assert.equal(cache.get("key1"), "newvalue1"); - }); - }); - - describe("Array methods", function () { - let cache; - - beforeEach(function () { - cache = new LRU(5); - cache.set("key1", "value1"); - cache.set("key2", "value2"); - cache.set("key3", "value3"); - }); - - it("should return all keys in LRU order", function () { - const keys = cache.keys(); - assert.deepEqual(keys, ["key1", "key2", "key3"]); - }); - - it("should return all values in LRU order", function () { - const values = cache.values(); - assert.deepEqual(values, ["value1", "value2", "value3"]); - }); - - it("should return values for specific keys", function () { - const values = cache.values(["key3", "key1"]); - assert.deepEqual(values, ["value3", "value1"]); - }); - - it("should return entries as [key, value] pairs", function () { - const entries = cache.entries(); - assert.deepEqual(entries, [ - ["key1", "value1"], - ["key2", "value2"], - ["key3", "value3"], - ]); - }); - - it("should return entries for specific keys", function () { - const entries = cache.entries(["key3", "key1"]); - assert.deepEqual(entries, [ - ["key3", "value3"], - ["key1", "value1"], - ]); - }); - - it("should handle empty cache", function () { - cache.clear(); - assert.deepEqual(cache.keys(), []); - assert.deepEqual(cache.values(), []); - assert.deepEqual(cache.entries(), []); - }); - }); - - describe("TTL (Time To Live)", function () { - let cache; - - beforeEach(function () { - cache = new LRU(5, 100); - }); - - it("should set expiration time", function () { - const beforeTime = Date.now(); - cache.set("key1", "value1"); - const expiresAt = cache.expiresAt("key1"); - - assert.ok(expiresAt >= beforeTime + 100); - assert.ok(expiresAt <= beforeTime + 200); - }); - - it("should return undefined for non-existent key expiration", function () { - assert.equal(cache.expiresAt("nonexistent"), undefined); - }); - - it("should expire items after TTL", async function () { - cache.set("key1", "value1"); - assert.equal(cache.get("key1"), "value1"); - - await new Promise((resolve) => setTimeout(resolve, 150)); - assert.equal(cache.get("key1"), undefined); - assert.equal(cache.has("key1"), false); - assert.equal(cache.size, 0); - }); - - it("should handle TTL = 0 (no expiration)", function () { - const neverExpireCache = new LRU(5, 0); - neverExpireCache.set("key1", "value1"); - assert.equal(neverExpireCache.expiresAt("key1"), 0); - }); - - it("should reset TTL when accessing with resetTtl=true", async function () { - const resetCache = new LRU(5, 1000, true); - resetCache.set("key1", "value1"); - - const firstExpiry = resetCache.expiresAt("key1"); - - await new Promise((resolve) => setTimeout(resolve, 10)); - resetCache.set("key1", "value1", false, true); - const secondExpiry = resetCache.expiresAt("key1"); - - assert.ok(secondExpiry > firstExpiry, "TTL should be reset"); - }); - - it("should not reset TTL when resetTtl=false", async function () { - const noResetCache = new LRU(5, 100, false); - noResetCache.set("key1", "value1"); - - await new Promise((resolve) => setTimeout(resolve, 50)); - assert.equal(noResetCache.get("key1"), "value1"); - - await new Promise((resolve) => setTimeout(resolve, 75)); - assert.equal(noResetCache.get("key1"), undefined); - }); - }); - - describe("Edge cases and complex scenarios", function () { - it("should handle updating existing key with set()", function () { - const cache = new LRU(3); - cache.set("key1", "value1"); - cache.set("key2", "value2"); - cache.set("key1", "newvalue1"); - - assert.equal(cache.get("key1"), "newvalue1"); - assert.equal(cache.size, 2); - }); - - it("should maintain correct first/last pointers during deletion", function () { - const cache = new LRU(3); - cache.set("key1", "value1"); - cache.set("key2", "value2"); - cache.set("key3", "value3"); - - cache.delete("key2"); - assert.deepEqual(cache.keys(), ["key1", "key3"]); - - cache.delete("key1"); - assert.deepEqual(cache.keys(), ["key3"]); - - cache.delete("key3"); - assert.deepEqual(cache.keys(), []); - assert.equal(cache.first, null); - assert.equal(cache.last, null); - }); - - it("should handle complex LRU repositioning", function () { - const cache = new LRU(4); - cache.set("a", 1); - cache.set("b", 2); - cache.set("c", 3); - cache.set("d", 4); - - cache.set("b", 22); - cache.get("a"); - cache.set("c", 33); - - assert.deepEqual(cache.keys(), ["d", "b", "a", "c"]); - }); - - it("should handle set with bypass parameter", function () { - const cache = new LRU(3); - cache.set("key1", "value1"); - cache.set("key2", "value2"); - - cache.set("key1", "newvalue1", true); - assert.deepEqual(cache.keys(), ["key2", "key1"]); - }); - - it("should handle resetTtl parameter in set method", function () { - const cache = new LRU(3, 1000, false); - const beforeTime = Date.now(); - cache.set("key1", "value1"); - - cache.set("key1", "newvalue1", false, true); - const expiresAt = cache.expiresAt("key1"); - assert.ok(expiresAt > beforeTime + 900); - }); - - it("should handle single item cache operations", function () { - const cache = new LRU(1); - - cache.set("key1", "value1"); - assert.equal(cache.first, cache.last); - assert.equal(cache.size, 1); - - cache.set("key2", "value2"); - assert.equal(cache.first, cache.last); - assert.equal(cache.size, 1); - assert.equal(cache.has("key1"), false); - assert.equal(cache.has("key2"), true); - }); - - it("should handle empty cache operations", function () { - const cache = new LRU(3); - - assert.equal(cache.get("key1"), undefined); - assert.equal(cache.has("key1"), false); - cache.delete("key1"); - assert.equal(cache.expiresAt("key1"), undefined); - - cache.evict(); - assert.equal(cache.size, 0); - }); - - it("should handle accessing items that become last", function () { - const cache = new LRU(3); - cache.set("key1", "value1"); - cache.set("key2", "value2"); - cache.set("key3", "value3"); - - cache.get("key3"); - assert.deepEqual(cache.keys(), ["key1", "key2", "key3"]); - }); - }); - - describe("Memory and performance", function () { - it("should handle large number of operations", function () { - const cache = new LRU(1000); - - for (let i = 0; i < 1000; i++) { - cache.set(`key${i}`, `value${i}`); - } - assert.equal(cache.size, 1000); - - for (let i = 0; i < 100; i++) { - const key = `key${Math.floor(Math.random() * 1000)}`; - cache.get(key); - } - - for (let i = 1000; i < 1100; i++) { - cache.set(`key${i}`, `value${i}`); - } - assert.equal(cache.size, 1000); - }); - - it("should handle alternating set/get operations", function () { - const cache = new LRU(10); - - for (let i = 0; i < 100; i++) { - cache.set(`key${i % 10}`, `value${i}`); - cache.get(`key${(i + 5) % 10}`); - } - - assert.equal(cache.size, 10); - }); - }); - - describe("Additional coverage tests", function () { - it("should handle setWithEvicted with unlimited cache size", function () { - const cache = new LRU(0); - const evicted = cache.setWithEvicted("key1", "value1"); - assert.equal(evicted, null); - assert.equal(cache.size, 1); - }); - - it("should handle setWithEvicted with first item insertion", function () { - const cache = new LRU(2); - cache.setWithEvicted("key1", "value1"); - assert.equal(cache.size, 1); - assert.equal(cache.first, cache.last); - }); - - it("should handle bypass parameter with resetTtl false", function () { - const cache = new LRU(3, 1000, false); - cache.set("key1", "value1"); - const originalExpiry = cache.expiresAt("key1"); - - cache.set("key1", "newvalue1", true, false); - const newExpiry = cache.expiresAt("key1"); - - assert.equal(originalExpiry, newExpiry); - }); - - it("should set expiry when using setWithEvicted with ttl > 0", function () { - const cache = new LRU(2, 100); - const before = Date.now(); - cache.set("a", 1); - cache.set("b", 2); - const evicted = cache.setWithEvicted("c", 3); - assert.notEqual(evicted, null); - const expiry = cache.expiresAt("c"); - assert.ok(expiry >= before + 100); - assert.ok(expiry <= before + 250); - }); - - it("should set expiry to 0 when resetTtl=true and ttl=0 on update", function () { - const cache = new LRU(2, 0); - cache.set("x", 1); - assert.equal(cache.expiresAt("x"), 0); - cache.set("x", 2, false, true); - assert.equal(cache.expiresAt("x"), 0); - }); - }); -});