26 lines
592 B
Markdown
26 lines
592 B
Markdown
---
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title: Check if two arrays intersect
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type: snippet
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tags: [array]
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author: chalarangelo
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cover: interior-5
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dateModified: 2023-02-17T05:00:00-04:00
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---
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Determines if two arrays have a common item.
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- Create a `Set` from `b` to get the unique values in `b`.
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- Use `Array.prototype.some()` on `a` to check if any of its values are contained in `b`, using `Set.prototype.has()`.
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```js
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const intersects = (a, b) => {
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const s = new Set(b);
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return [...new Set(a)].some(x => s.has(x));
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};
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```
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```js
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intersects(['a', 'b'], ['b', 'c']); // true
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intersects(['a', 'b'], ['c', 'd']); // false
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```
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