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