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snippets/js/s/closest.md

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+---
+title: Closest numeric match
+type: snippet
+language: javascript
+tags: [math]
+author: chalarangelo
+cover: sparkles
+dateModified: 2022-03-30T05:00:00-04:00
+---
+
+Finds the closest number from an array.
+
+- Use `Array.prototype.reduce()` to scan all elements of the array.
+- Use `Math.abs()` to compare each element's distance from the target value, storing the closest match.
+
+```js
+const closest = (arr, n) =>
+  arr.reduce((acc, num) => (Math.abs(num - n) < Math.abs(acc - n) ? num : acc));
+```
+
+```js
+closest([6, 1, 3, 7, 9], 5); // 6
+```