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30-seconds-of-code/snippets/js/s/function-based-array-min.md
Angelos Chalaris 9d032ce05e Rename js snippets
2023-05-19 20:23:47 +03:00

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---
title: Min array value based on function
type: snippet
language: javascript
tags: [math,array]
cover: digital-nomad-9
dateModified: 2020-10-21T21:54:53+03:00
---
Returns the minimum value of an array, after mapping each element to a value using the provided function.
- Use `Array.prototype.map()` to map each element to the value returned by `fn`.
- Use `Math.min()` to get the minimum value.
```js
const minBy = (arr, fn) =>
Math.min(...arr.map(typeof fn === 'function' ? fn : val => val[fn]));
```
```js
minBy([{ n: 4 }, { n: 2 }, { n: 8 }, { n: 6 }], x => x.n); // 2
minBy([{ n: 4 }, { n: 2 }, { n: 8 }, { n: 6 }], 'n'); // 2
```