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48 lines
1.1 KiB
48 lines
1.1 KiB
4 years ago
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# `flatten()`
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The flatten method flattens a multi-dimensional collection into a single dimension:
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```js
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const collection = collect({
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club: 'Liverpool',
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players: ['Salah', 'Firmino', 'Mané'],
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});
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const flattened = collection.flatten();
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flattened.all();
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// ['Liverpool', 'Salah', 'Firmino', 'Mané'];
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```
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You may optionally pass the function a "depth" argument:
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```js
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const collection = collect({
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Apple: [
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{
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name: 'iPhone 6S',
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brand: 'Apple',
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},
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],
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Samsung: [
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{
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name: 'Galaxy S7',
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brand: 'Samsung',
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},
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],
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});
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const flattened = collection.flatten(1);
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flattened.all();
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// [
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// { name: 'iPhone 6S', brand: 'Apple' },
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// { name: 'Galaxy S7', brand: 'Samsung' },
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// ]
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```
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In this example, calling flatten without providing the depth would have also flattened the nested arrays, resulting in `['iPhone 6S', 'Apple', 'Galaxy S7', 'Samsung']`. Providing a depth allows you to restrict the levels of nested arrays that will be flattened.
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[View source on GitHub](https://github.com/ecrmnn/collect.js/blob/master/src/methods/flatten.js)
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