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56 lines
1.1 KiB
56 lines
1.1 KiB
4 years ago
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# `keyBy()`
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The keyBy method keys the collection by the given key. If multiple items have the same key, only the last one will appear in the new collection:
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```js
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const collection = collect([
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{
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product: 'Chair',
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manufacturer: 'IKEA',
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},
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{
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product: 'Desk',
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manufacturer: 'IKEA',
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},
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{
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product: 'Chair',
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manufacturer: 'Herman Miller',
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},
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]);
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const keyed = collection.keyBy('manufacturer');
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keyed.all();
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// {
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// IKEA: {
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// product: 'Desk',
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// manufacturer: 'IKEA',
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// },
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// 'Herman Miller': {
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// product: 'Chair',
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// manufacturer: 'Herman Miller',
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// },
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// }
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```
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You may also pass a callback to the method. The callback should return the value to key the collection by:
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```js
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const upperCased = collection.keyBy(item => item.manufacturer.toUpperCase());
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upperCased.all();
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// {
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// IKEA: {
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// product: 'Desk',
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// manufacturer: 'IKEA',
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// },
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// 'HERMAN MILLER': {
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// product: 'Chair',
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// manufacturer: 'Herman Miller',
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// },
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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/keyBy.js)
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