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# `keyBy()`
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:
```js
const collection = collect([
{
product: 'Chair',
manufacturer: 'IKEA',
},
{
product: 'Desk',
manufacturer: 'IKEA',
},
{
product: 'Chair',
manufacturer: 'Herman Miller',
},
]);
const keyed = collection.keyBy('manufacturer');
keyed.all();
// {
// IKEA: {
// product: 'Desk',
// manufacturer: 'IKEA',
// },
// 'Herman Miller': {
// product: 'Chair',
// manufacturer: 'Herman Miller',
// },
// }
```
You may also pass a callback to the method. The callback should return the value to key the collection by:
```js
const upperCased = collection.keyBy(item => item.manufacturer.toUpperCase());
upperCased.all();
// {
// IKEA: {
// product: 'Desk',
// manufacturer: 'IKEA',
// },
// 'HERMAN MILLER': {
// product: 'Chair',
// manufacturer: 'Herman Miller',
// },
// }
```
[View source on GitHub](https://github.com/ecrmnn/collect.js/blob/master/src/methods/keyBy.js)