24 lines
506 B
Markdown
24 lines
506 B
Markdown
---
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title: Array intersection
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type: snippet
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language: javascript
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tags: [array]
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cover: orange-coffee
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dateModified: 2020-10-20T23:02:01+03:00
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---
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Returns the elements that exist in both arrays, filtering duplicate values.
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- Create a `Set` from `b`, then use `Array.prototype.filter()` on `a` to only keep values contained in `b`.
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```js
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const intersection = (a, b) => {
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const s = new Set(b);
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return [...new Set(a)].filter(x => s.has(x));
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};
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```
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```js
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intersection([1, 2, 3], [4, 3, 2]); // [2, 3]
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```
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