27 lines
727 B
Markdown
27 lines
727 B
Markdown
---
|
|
title: Toggle element in array
|
|
type: snippet
|
|
language: javascript
|
|
tags: [array]
|
|
author: chalarangelo
|
|
cover: digital-nomad-7
|
|
dateModified: 2022-04-15T05:00:00-04:00
|
|
---
|
|
|
|
Removes an element from an array if it's included in the array, or pushes it to the array if it isn't.
|
|
|
|
- Use `Array.prototype.includes()` to check if the given element is in the array.
|
|
- Use `Array.prototype.filter()` to remove the element if it's in the array.
|
|
- Use the spread operator (`...`) to push the element if it's not in the array.
|
|
|
|
```js
|
|
const toggleElement = (arr, val) =>
|
|
arr.includes(val) ? arr.filter(el => el !== val) : [...arr, val];
|
|
|
|
```
|
|
|
|
```js
|
|
toggleElement([1, 2, 3], 2); // [1, 3]
|
|
toggleElement([1, 2, 3], 4); // [1, 2, 3, 4]
|
|
```
|