22 lines
490 B
Markdown
22 lines
490 B
Markdown
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# `mapToGroups()`
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The mapToGroups method iterates through the collection and passes each value to the given callback:
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```js
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const collection = collect([
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{ id: 1, name: 'A' },
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{ id: 2, name: 'B' },
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{ id: 3, name: 'C' },
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{ id: 4, name: 'B' },
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]);
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const groups = collection.mapToGroups((item, key) => [item.name, item.id]);
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// {
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// A: [1],
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// B: [2, 4],
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// C: [3],
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// }
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```
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[View source on GitHub](https://github.com/ecrmnn/collect.js/blob/master/src/methods/mapToGroups.js)
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