[Autoloop] [Autoloop: build-tsb-pandas-typescript-migration]

🤖 *This PR is maintained by Autoloop. Each accepted iteration adds a commit to this branch.*

## Program Goal

Build `tsb` — a complete TypeScript port of pandas, one feature at a time.

**Linked Issue**: #1
**Current Best Metric**: 134 `pandas_features_ported` (this iteration adds +1)
**Branch**: `autoloop/build-tsb-pandas-typescript-migration`

## This Iteration (281): `strGetDummies`

Ports `pandas.Series.str.get_dummies(sep)` as the standalone function `strGetDummies(series, { sep })`.

### What it does
- Splits each string element by a separator (default `"|"`)
- Returns a `DataFrame` of binary indicator columns — one per unique token
- Columns are sorted lexicographically
- `null` / `undefined` / `NaN` values produce all-zero rows
- Preserves the original Series index

### Files changed
- `src/stats/str_get_dummies.ts` — implementation
- `tests/stats/str_get_dummies.test.ts` — unit + property-based tests
- `playground/str_get_dummies.html` — interactive tutorial
- `src/stats/index.ts`, `src/index.ts` — exports




> Generated by [Autoloop](https://github.com/githubnext/tsessebe/actions/runs/24923038245/agentic_workflow) · ● 7.5M · [◷](https://github.com/search?q=repo%3Agithubnext%2Ftsessebe+%22gh-aw-workflow-id%3A+autoloop%22&type=pullrequests)





---

> [!NOTE]
> This was originally intended as a pull request, but the git push operation failed.
>
> **Workflow Run:** [View run details and download patch artifact](https://github.com/githubnext/tsessebe/actions/runs/24923038245)
>
> The patch file is available in the `agent` artifact in the workflow run linked above.

To create a pull request with the changes:

```sh
# Download the artifact from the workflow run
gh run download 24923038245 -n agent -D /tmp/agent-24923038245

# Create a new branch
git checkout -b autoloop/build-tsb-pandas-typescript-migration

# Apply the patch (--3way handles cross-repo patches where files may already exist)
git am --3way /tmp/agent-24923038245/aw-autoloop-build-tsb-pandas-typescript-migration.patch

# Push the branch to origin
git push origin autoloop/build-tsb-pandas-typescript-migration

# Create the pull request
gh pr create --title '[Autoloop] [Autoloop: build-tsb-pandas-typescript-migration]' --base main --head autoloop/build-tsb-pandas-typescript-migration --repo githubnext/tsessebe
```


<details><summary>Show patch preview (500 of 575 lines)</summary>

```diff
From 6855cb2de3e9575745938e92481282830adcc756 Mon Sep 17 00:00:00 2001
From: "github-actions[bot]" <github-actions[bot]@users.noreply.github.com>
Date: Sat, 25 Apr 2026 05:05:08 +0000
Subject: [PATCH] [Autoloop: build-tsb-pandas-typescript-migration] Iteration
 281: add strGetDummies (str.get_dummies)
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Port pandas.Series.str.get_dummies(sep) — splits each string by sep and
returns a DataFrame of binary indicator columns, one per unique token.
Sorted lexicographically. Null/undefined rows produce all-zero rows.

Run: https://github.com/githubnext/tsessebe/actions/runs/24923038245

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
---
 playground/str_get_dummies.html     | 127 +++++++++++++
 src/index.ts                        |   2 +
 src/stats/index.ts                  |   3 +
 src/stats/str_get_dummies.ts        | 109 ++++++++++++
 tests/stats/str_get_dummies.test.ts | 266 ++++++++++++++++++++++++++++
 5 files changed, 507 insertions(+)
 create mode 100644 playground/str_get_dummies.html
 create mode 100644 src/stats/str_get_dummies.ts
 create mode 100644 tests/stats/str_get_dummies.test.ts

diff --git a/playground/str_get_dummies.html b/playground/str_get_dummies.html
new file mode 100644
index 0000000..4d0624b
--- /dev/null
+++ b/playground/str_get_dummies.html
@@ -0,0 +1,127 @@
+<!doctype html>
+<html lang="en">
+  <head>
+    <meta charset="UTF-8" />
+    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
+    <title>tsb — str.get_dummies: multi-label string encoding</title>
+    <style>
+      * { box-sizing: border-box; margin: 0; padding: 0; }
+      body { font-family: system-ui, sans-serif; background: #0d1117; color: #c9d1d9; line-height: 1.6; padding: 2rem; }
+      h1 { color: #58a6ff; font-size: 1.8rem; margin-bottom: .5rem; }
+      h2 { color: #79c0ff; font-size: 1.2rem; margin: 2rem 0 .75rem; }
+      p  { color: #8b949e
... (truncated)
```

</details>

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[Autoloop] [Autoloop: build-tsb-pandas-typescript-migration] #220

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This Iteration (281): `strGetDummies`