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