23 lines
621 B
Markdown
23 lines
621 B
Markdown
---
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title: Check if array elements are equal
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tags: array
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expertise: beginner
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cover: blog_images/shelf-plant.jpg
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firstSeen: 2018-08-03T00:03:08+03:00
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lastUpdated: 2020-10-18T20:24:28+03:00
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---
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Checks if all elements in an array are equal.
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- Use `Array.prototype.every()` to check if all the elements of the array are the same as the first one.
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- Elements in the array are compared using the strict comparison operator, which does not account for `NaN` self-inequality.
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```js
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const allEqual = arr => arr.every(val => val === arr[0]);
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```
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```js
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allEqual([1, 2, 3, 4, 5, 6]); // false
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allEqual([1, 1, 1, 1]); // true
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```
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