String.prototype.at() - JavaScript

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String consisting of the single UTF-16 code unit located at the specified offset. This method allows for positive and negative integers. Negative integers count back from the last string character.

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Syntax

at(index)

Parameters

index: The index (position) of the string character to be returned. Supports relative indexing from the end of the string when passed a negative index; i.e., if a negative number is used, the character returned will be found by counting back from the end of the string.

Return value

A undefined if the given index can not be found.

Examples

Return the last character of a string

The following example provides a function which returns the last character found in a specified string.

js
/ A function which returns the last character of a given string function returnLast(str) { return str.at(-1); } let invoiceRef = "my-invoice01"; console.log(returnLast(invoiceRef)); / '1' invoiceRef = "my-invoice02"; console.log(returnLast(invoiceRef)); / '2'

Comparing methods

Here we compare different ways to select the penultimate (last but one) character of a String. Whilst all below methods are valid, it highlights the succinctness and readability of the at() method.

js
const myString = "Every green bus drives fast."; / Using length property and charAt() method const lengthWay = myString.charAt(myString.length - 2); console.log(lengthWay); / 't' / Using slice() method const sliceWay = myString.slice(-2, -1); console.log(sliceWay); / 't' / Using at() method const atWay = myString.at(-2); console.log(atWay); / 't'

Specifications

Specification
ECMAScript® 2026 Language Specification # sec-string.prototype.at

Browser compatibility

See also

Polyfill of String.prototype.at in core-js

es-shims polyfill of String.prototype.at

String.prototype.indexOf()

String.prototype.lastIndexOf()

String.prototype.charCodeAt()

String.prototype.codePointAt()

String.prototype.split()

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at() method of strings returns the character (one UTF-16 code unit) at an index, including negative indices for getting the character relative to the end of the string. Also known as the relative indexing method.","name":"String at()"}},"browserCompat":["javascript.builtins.String.at"],"pageType":"javascript-instance-method"}}
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