diff --git a/config.json b/config.json index 9af6dbaa17..9470286148 100644 --- a/config.json +++ b/config.json @@ -1156,6 +1156,21 @@ "regular_expressions" ] }, + { + "uuid": "9c140fb7-cc8b-411b-b613-a0e0081a9c3f", + "slug": "transpose", + "core": false, + "unlocked_by": "matrix", + "difficulty": 1, + "topics": [ + "loops", + "arrays", + "lists", + "matrices", + "strings", + "text_formatting" + ] + }, { "uuid": "775ae0ec-8db7-4568-a188-963931cf5ee1", "slug": "protein-translation", diff --git a/exercises/transpose/README.md b/exercises/transpose/README.md new file mode 100644 index 0000000000..d8f8547317 --- /dev/null +++ b/exercises/transpose/README.md @@ -0,0 +1,94 @@ +# Transpose + +Given an input text output it transposed. + +Roughly explained, the transpose of a matrix: + +```text +ABC +DEF +``` + +is given by: + +```text +AD +BE +CF +``` + +Rows become columns and columns become rows. See . + +If the input has rows of different lengths, this is to be solved as follows: + +- Pad to the left with spaces. +- Don't pad to the right. + +Therefore, transposing this matrix: + +```text +ABC +DE +``` + +results in: + +```text +AD +BE +C +``` + +And transposing: + +```text +AB +DEF +``` + +results in: + +```text +AD +BE + F +``` + +In general, all characters from the input should also be present in the transposed output. +That means that if a column in the input text contains only spaces on its bottom-most row(s), +the corresponding output row should contain the spaces in its right-most column(s). + +## Setup + +Go through the setup instructions for ECMAScript to +install the necessary dependencies: + +http://exercism.io/languages/ecmascript + +## Requirements + +Install assignment dependencies: + +```bash +$ npm install +``` + +## Making the Test Suite Pass + +Execute the tests with: + +```bash +$ npm test +``` + +In the test suite, all tests but the first have been skipped. + +Once you get a test passing, you can enable the next one by +changing `xtest` to `test`. + +## Source + +Reddit r/dailyprogrammer challenge #270 [Easy]. [https://www.reddit.com/r/dailyprogrammer/comments/4msu2x/challenge_270_easy_transpose_the_input_text](https://www.reddit.com/r/dailyprogrammer/comments/4msu2x/challenge_270_easy_transpose_the_input_text) + +## Submitting Incomplete Solutions +It's possible to submit an incomplete solution so you can see how others have completed the exercise. diff --git a/exercises/transpose/example.js b/exercises/transpose/example.js new file mode 100644 index 0000000000..1622e99333 --- /dev/null +++ b/exercises/transpose/example.js @@ -0,0 +1,12 @@ +function trimTrailingUndefined(array) { + const trailingUndefinedCount = [...array].reverse().findIndex(x => x !== undefined); + return array.slice(0, array.length - trailingUndefinedCount); +} + +export default function transpose(input) { + const maxCol = Math.max(0, ...(input.map(row => row.length))); + return [...Array(maxCol).keys()].map(col => + trimTrailingUndefined(input.map((_v, row) => input[row][col])) + .map(charOrUndefined => charOrUndefined || ' ') + .join('')); +} diff --git a/exercises/transpose/package.json b/exercises/transpose/package.json new file mode 100644 index 0000000000..67a12e6049 --- /dev/null +++ b/exercises/transpose/package.json @@ -0,0 +1,71 @@ +{ + "name": "xecmascript", + "version": "0.0.0", + "description": "Exercism exercises in ECMAScript 6.", + "author": "Katrina Owen", + "private": true, + "repository": { + "type": "git", + "url": "https://github.com/exercism/xecmascript" + }, + "devDependencies": { + "babel-jest": "^20.0.3", + "babel-plugin-transform-builtin-extend": "^1.1.2", + "babel-preset-env": "^1.4.0", + "eslint": "^3.19.0", + "eslint-config-airbnb": "^15.0.1", + "eslint-plugin-import": "^2.2.0", + "eslint-plugin-jsx-a11y": "^5.0.1", + "eslint-plugin-react": "^7.0.1", + "jest": "^20.0.4" + }, + "jest": { + "modulePathIgnorePatterns": [ + "package.json" + ] + }, + "babel": { + "presets": [ + "env" + ], + "plugins": [ + [ + "babel-plugin-transform-builtin-extend", + { + "globals": [ + "Error" + ] + } + ], + [ + "transform-regenerator" + ] + ] + }, + "scripts": { + "test": "jest --no-cache ./*", + "watch": "jest --no-cache --watch ./*", + "lint": "eslint .", + "lint-test": "eslint . && jest --no-cache ./* " + }, + "eslintConfig": { + "parserOptions": { + "ecmaVersion": 6, + "sourceType": "module" + }, + "env": { + "es6": true, + "node": true, + "jest": true + }, + "extends": "airbnb", + "rules": { + "import/no-unresolved": "off", + "import/extensions": "off" + } + }, + "licenses": [ + "MIT" + ], + "dependencies": {} +} diff --git a/exercises/transpose/transpose.spec.js b/exercises/transpose/transpose.spec.js new file mode 100644 index 0000000000..05a345e631 --- /dev/null +++ b/exercises/transpose/transpose.spec.js @@ -0,0 +1,121 @@ +import transpose from './transpose'; + +describe('Transpose', () => { + test('empty string', () => { + expect(transpose([])).toEqual([]); + }); + + xtest('two characters in a row', () => { + const input = ['A1']; + const expected = ['A', '1']; + expect(transpose(input)).toEqual(expected); + }); + + xtest('two characters in a column', () => { + const input = ['A', '1']; + const expected = ['A1']; + expect(transpose(input)).toEqual(expected); + }); + + xtest('simple', () => { + const input = ['ABC', '123']; + const expected = ['A1', 'B2', 'C3']; + expect(transpose(input)).toEqual(expected); + }); + + xtest('single line', () => { + const input = ['Single line.']; + const expected = ['S', 'i', 'n', 'g', 'l', 'e', ' ', 'l', 'i', 'n', 'e', '.']; + expect(transpose(input)).toEqual(expected); + }); + + xtest('first line longer than second line', () => { + const input = ['The fourth line.', 'The fifth line.']; + const expected = ['TT', 'hh', 'ee', ' ', 'ff', 'oi', 'uf', 'rt', 'th', 'h ', ' l', 'li', 'in', 'ne', 'e.', '.']; + expect(transpose(input)).toEqual(expected); + }); + + xtest('second line longer than first line', () => { + const input = ['The first line.', 'The second line.']; + const expected = ['TT', 'hh', 'ee', ' ', 'fs', 'ie', 'rc', 'so', 'tn', ' d', 'l ', 'il', 'ni', 'en', '.e', ' .']; + expect(transpose(input)).toEqual(expected); + }); + + xtest('square', () => { + const input = ['HEART', 'EMBER', 'ABUSE', 'RESIN', 'TREND']; + const expected = ['HEART', 'EMBER', 'ABUSE', 'RESIN', 'TREND']; + expect(transpose(input)).toEqual(expected); + }); + + xtest('rectangle', () => { + const input = ['FRACTURE', 'OUTLINED', 'BLOOMING', 'SEPTETTE']; + const expected = ['FOBS', 'RULE', 'ATOP', 'CLOT', 'TIME', 'UNIT', 'RENT', 'EDGE']; + expect(transpose(input)).toEqual(expected); + }); + + xtest('triangle', () => { + const input = ['T', 'EE', 'AAA', 'SSSS', 'EEEEE', 'RRRRRR']; + const expected = ['TEASER', ' EASER', ' ASER', ' SER', ' ER', ' R']; + expect(transpose(input)).toEqual(expected); + }); + + xtest('many lines', () => { + const input = ['Chor. Two households, both alike in dignity,', 'In fair Verona, where we lay our scene,', 'From ancient grudge break to new mutiny,', 'Where civil blood makes civil hands unclean.', 'From forth the fatal loins of these two foes', 'A pair of star-cross\'d lovers take their life;', 'Whose misadventur\'d piteous overthrows', 'Doth with their death bury their parents\' strife.', 'The fearful passage of their death-mark\'d love,', 'And the continuance of their parents\' rage,', 'Which, but their children\'s end, naught could remove,', 'Is now the two hours\' traffic of our stage;', 'The which if you with patient ears attend,', 'What here shall miss, our toil shall strive to mend.']; + const expected = [ + 'CIFWFAWDTAWITW', + 'hnrhr hohnhshh', + 'o oeopotedi ea', + 'rfmrmash cn t', + '.a e ie fthow ', + ' ia fr weh,whh', + 'Trnco miae ie', + 'w ciroitr btcr', + 'oVivtfshfcuhhe', + ' eeih a uote ', + 'hrnl sdtln is', + 'oot ttvh tttfh', + 'un bhaeepihw a', + 'saglernianeoyl', + 'e,ro -trsui ol', + 'h uofcu sarhu ', + 'owddarrdan o m', + 'lhg to\'egccuwi', + 'deemasdaeehris', + 'sr als t ists', + ',ebk \'phool\'h,', + ' reldi ffd ', + 'bweso tb rtpo', + 'oea ileutterau', + 't kcnoorhhnatr', + 'hl isvuyee\'fi ', + ' atv es iisfet', + 'ayoior trr ino', + 'l lfsoh ecti', + 'ion vedpn l', + 'kuehtteieadoe ', + 'erwaharrar,fas', + ' nekt te rh', + 'ismdsehphnnosa', + 'ncuse ra-tau l', + ' et tormsural', + 'dniuthwea\'g t ', + 'iennwesnr hsts', + 'g,ycoi tkrttet', + 'n ,l r s\'a anr', + 'i ef \'dgcgdi', + 't aol eoe,v', + 'y nei sl,u; e', + ', .sf to l ', + ' e rv d t', + ' ; ie o', + ' f, r ', + ' e e m', + ' . m e', + ' o n', + ' v d', + ' e .', + ' ,', + ]; + expect(transpose(input)).toEqual(expected); + }); +});