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