JavaScript Array at()
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Definition and Usage
at() method returns the element at the specified index position in the array.
at() The method is similar to [] has the same effect.
Since March 2022,at() The method is supported in all modern browsers.
Note
Many programming languages allow the use of negative indices (such as [-1]) to access the end elements of objects/arrays/strings.
In JavaScript, this is not possible because [] Used to access arrays and objects. obj[-1] refers to the value of the key -1, not the last property of the object.
at() The method was introduced in ES2022 to solve this problem.
Example
Example 1
Get the third element of the fruits array:
const fruits = ["Banana", "Orange", "Apple", "Mango"]; let fruit = fruits.at(2);
Example 2
Use [] to get the third element of the fruits array:
const fruits = ["Banana", "Orange", "Apple", "Mango"]; let fruit = fruits[2];
Example 3
Get the first element of the fruits array:
const fruits = ["Banana", "Orange", "Apple", "Mango"]; let fruit = fruits.at();
Example 4
Get the last element of the fruits array:
const fruits = ["Banana", "Orange", "Apple", "Mango"]; let fruit = fruits.at(-1);
Syntax
array.at(index)
Parameter
| Parameter | Description |
|---|---|
| index |
Optional. The index (position) of the array element to return. Default value is 0. -1 returns the last element. |
Return Value
| Type | Description |
|---|---|
| the element at the given position (index) in the array. |
Browser Support
Since March 2022, JavaScript arrays at() The method is supported in all browsers:
| Chrome | Edge | Firefox | Safari | Opera |
|---|---|---|---|---|
| Chrome 92 | Edge 92 | Firefox 90 | Safari 15.4 | Opera 78 |
| April 2021 | July 2021 | July 2021 | March 2022 | August 2021 |
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