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snippets/intersects.md

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