what is at() method in JavaScript?

user_5737950 0
Viewed 175

Array.prototype.at()

what is .at() method in JavaScript?

const myList = ['index0', 'index1', 'index2']

myList.at(1) // 'index1'
mylist.at(-1) // 'index2'

there are many methods in js that similarly do this, why using this new method?

arrays javascript string
1 Answers

Yes, there are similar ways to get an element from an array or string, but at() will use a clear and easy syntax to get this.

give an index and return value

the principle is easy, just put your desire index and get value, if there isn't a value at this index, it returns undefined

for examples:

const myList = ['index0', 'index1', 'index2']

// to get latest item in the list using common ways:
const latestItem = myList[ myList.length - 1]

// using simpler approach with at()
const latestItem = myList.at(-1)

similarly, at() method will work fine with strings.

  • at the writing time of this post, at() will not be supported by some browser, you can find this here.
  • you can use polyfill if you want to use at() method in your codebase.
user_57379500
Related