20 lines
413 B
Markdown
20 lines
413 B
Markdown
---
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title: Array union
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tags: array
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expertise: beginner
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firstSeen: 2017-12-17T16:41:31+02:00
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lastUpdated: 2020-10-22T20:24:44+03:00
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---
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Returns every element that exists in any of the two arrays at least once.
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- Create a `Set` with all values of `a` and `b` and convert it to an array.
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```js
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const union = (a, b) => Array.from(new Set([...a, ...b]));
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```
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```js
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union([1, 2, 3], [4, 3, 2]); // [1, 2, 3, 4]
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```
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