# Find the closest number from an array

Written byPhuoc Nguyen

Category

Array

Created

22 May, 2020

Last updated

13 Oct, 2021

**JavaScript version**

closest.js

`// Find the number from `arr` which is closest to `n``

const closest = (arr, n) => arr.reduce((prev, curr) => (Math.abs(curr - n) < Math.abs(prev - n) ? curr : prev));

// Or

const closest = (arr, n) => arr.sort((a, b) => Math.abs(a - n) - Math.abs(b - n))[0];

**TypeScript version**

closest.ts

`const closest = (arr: number[], n: number): number =>`

arr.reduce((prev, curr) => (Math.abs(curr - n) < Math.abs(prev - n) ? curr : prev));

// Or

const closest = (arr: number[], n: number): number => arr.sort((a, b) => Math.abs(a - n) - Math.abs(b - n))[0];

**Example**

example.js

`closest([29, 87, 8, 78, 97, 20, 75, 33, 24, 17], 50); // 33`

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