Widely available A small readability improvement that is worth using when you often read the last or near-last character.

String at()

The at() method of String values takes an integer value and returns a new 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.

StringsIndexingES2022

Browser support

Feature Desktop Mobile
Chrome
Edge
Firefox
Safari
Chrome Android
Safari iOS
javascript.builtins.String.at
92
92
90
15.4
92
15.4
1+Supported (version) Not supported ※Has note Sub-feature descriptions sourced from MDN Web Docs (CC BY-SA 2.5)

Syntax

JAVASCRIPT 
const str = 'Hello';

str.at(0);   // 'H'
str.at(-1);  // 'o'
str.at(-2);  // 'l'

Live demo

end. Character Read

At(-1) Use, string. last. 1character read..

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specificposition. Character

positivenegative. index in character to akses..

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saroge-tpea(emoji). note

At is co-dyunitbe-s., emoji. to note that main..

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Use cases

  • Reading the last character

    Use at(-1) for file extensions, suffix markers, or quick boundary checks.

  • Tail-oriented parsing

    Negative indexes keep string parsing code shorter when you need the end of a token or input.

Cautions

  • Out-of-range access returns undefined, so guard against missing values when later code assumes a string.
  • at() still works on UTF-16 code units, so complex emoji and grapheme clusters may need a different API.

Accessibility

  • If character inspection affects validation or formatting, make the resulting feedback visible and understandable to users.

Related links