DietrichGebertandClaude Opus 4.8
ff5d0936be
Em dashes crept back into examples, docs/platform-native.md, several READMEs,
the ponytail-debt skill, and a command file since 88431de. Replaced with plain
punctuation (commas, matching the house convention), .openclaw mirror
regenerated. Follows 88431de's scope: leaves untouched the vendored caveman
SKILL.md and the dated benchmarks/results/ writeups (historical records).
Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>
36 lines
937 B
Markdown
36 lines
937 B
Markdown
# Group By
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**Task:** "Group this array of objects by a key."
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## Without Ponytail
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```bash
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npm install lodash
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```
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```js
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import { groupBy } from "lodash";
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const byStatus = groupBy(orders, "status");
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// → { pending: [...], shipped: [...], delivered: [...] }
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```
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Or the hand-rolled version:
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```js
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const byStatus = orders.reduce((acc, order) => {
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(acc[order.status] ??= []).push(order);
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return acc;
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}, {});
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```
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## With Ponytail
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```js
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// ponytail: Object.groupBy does this
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const byStatus = Object.groupBy(orders, order => order.status);
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// → { pending: [...], shipped: [...], delivered: [...] }
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```
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**1 dependency (or a reduce) → 1 built-in.** `Object.groupBy` shipped in Chrome 117, Firefox 119, Safari 17.4, Node.js 21. If you need a `Map` instead of a plain object: `Map.groupBy(orders, o => o.status)`. Check your target runtime; if you need IE11 or old Node, the `reduce` one-liner is still the right call, not lodash.
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