23 lines
564 B
Markdown
23 lines
564 B
Markdown
---
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title: Last array element
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tags: array,beginner
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firstSeen: 2017-12-17T17:55:51+02:00
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lastUpdated: 2020-10-20T23:02:01+03:00
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---
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Returns the last element in an array.
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- Check if `arr` is truthy and has a `length` property.
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- Use `Array.prototype.length - 1` to compute the index of the last element of the given array and return it, otherwise return `undefined`.
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```js
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const last = arr => (arr && arr.length ? arr[arr.length - 1] : undefined);
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```
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```js
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last([1, 2, 3]); // 3
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last([]); // undefined
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last(null); // undefined
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last(undefined); // undefined
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```
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