26 lines
681 B
Markdown
26 lines
681 B
Markdown
---
|
|
title: Execute function for each array element in reverse
|
|
tags: array
|
|
expertise: intermediate
|
|
cover: blog_images/interior-6.jpg
|
|
firstSeen: 2018-01-09T01:38:50+02:00
|
|
lastUpdated: 2020-10-19T22:49:51+03:00
|
|
---
|
|
|
|
Executes a provided function once for each array element, starting from the array's last element.
|
|
|
|
- Use `Array.prototype.slice()` to clone the given array and `Array.prototype.reverse()` to reverse it.
|
|
- Use `Array.prototype.forEach()` to iterate over the reversed array.
|
|
|
|
```js
|
|
const forEachRight = (arr, callback) =>
|
|
arr
|
|
.slice()
|
|
.reverse()
|
|
.forEach(callback);
|
|
```
|
|
|
|
```js
|
|
forEachRight([1, 2, 3, 4], val => console.log(val)); // '4', '3', '2', '1'
|
|
```
|