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59 lines
1.6 KiB
59 lines
1.6 KiB
4 years ago
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# `unique()`
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The unique method returns all of the unique items in the collection:
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```js
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const collection = collect([1, 1, 1, 2, 3, 3]);
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const unique = collection.unique();
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unique.all();
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// [1, 2, 3]
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```
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When dealing with an array of objects, you may specify the key used to determine uniqueness:
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```js
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const collection = collect([
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{ name: 'iPhone 6', brand: 'Apple', type: 'phone' },
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{ name: 'iPhone 5', brand: 'Apple', type: 'phone' },
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{ name: 'Apple Watch', brand: 'Apple', type: 'watch' },
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{ name: 'Galaxy S6', brand: 'Samsung', type: 'phone' },
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{ name: 'Galaxy Gear', brand: 'Samsung', type: 'watch' },
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]);
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const unique = collection.unique('brand');
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unique.all();
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// [
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// { name: 'iPhone 6', brand: 'Apple', type: 'phone' },
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// { name: 'Galaxy S6', brand: 'Samsung', type: 'phone' },
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// ]
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```
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You may also pass your own callback to determine item uniqueness:
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```js
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const collection = collect([
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{ name: 'iPhone 6', brand: 'Apple', type: 'phone' },
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{ name: 'iPhone 5', brand: 'Apple', type: 'phone' },
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{ name: 'Apple Watch', brand: 'Apple', type: 'watch' },
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{ name: 'Galaxy S6', brand: 'Samsung', type: 'phone' },
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{ name: 'Galaxy Gear', brand: 'Samsung', type: 'watch' },
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]);
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const unique = collection.unique(item => item.brand + item.type);
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unique.all();
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// [
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// { name: 'iPhone 6', brand: 'Apple', type: 'phone' },
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// { name: 'Apple Watch', brand: 'Apple', type: 'watch' },
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// { name: 'Galaxy S6', brand: 'Samsung', type: 'phone' },
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// { name: 'Galaxy Gear', brand: 'Samsung', type: 'watch' },
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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/unique.js)
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