23 lines
547 B
Markdown
23 lines
547 B
Markdown
---
|
|
title: Closest numeric match
|
|
tags: math,array
|
|
expertise: intermediate
|
|
author: chalarangelo
|
|
cover: blog_images/sparkles.jpg
|
|
firstSeen: 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
|
|
```
|