19 lines
473 B
Markdown
19 lines
473 B
Markdown
---
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title: allEqual
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tags: array,beginner
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---
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Check 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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