20 lines
458 B
Markdown
20 lines
458 B
Markdown
---
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title: last
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tags: array,beginner
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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, use `arr.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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