String

`String.prototype.codePointAt`

Returns a non-negative integer that is the Unicode code point value at the given position

Syntax

JavaScript

string.codePointAt(pos)

Parameters

Parameter	Type	Description
pos	number	Position of the character

Return Value

A number representing the code point, or undefined if out of range

Examples

Basic Usage

const emoji = '😀';
console.log(emoji.codePointAt(0)); // 128512

Practical Example

console.log('ABC'.codePointAt(0)); // 65
console.log('☃'.codePointAt(0)); // 9731

Advanced Usage

const str = '𝒜';
console.log(str.codePointAt(0)); // 119964
console.log(String.fromCodePoint(119964)); // '𝒜'

Understanding String.prototype.codePointAt

The String.prototype.codePointAt method in JavaScript returns a non-negative integer that is the Unicode code point value at the given position. It belongs to the String object and is one of the most widely used methods for working with string values in modern JavaScript and TypeScript applications.

The method signature is string.codePointAt(pos). It accepts 1 parameter: pos. When called, it returns a number representing the code point, or undefined if out of range. Understanding when and how to use codePointAt() helps you write more expressive, readable code.

Common use cases for String.prototype.codePointAt include data transformation, input validation, API response processing, and building reusable utility functions. It works well alongside related methods like string-charcodeat, string-fromcodepoint, string-charat, enabling you to chain operations together for complex data manipulation pipelines.

Browser support for String.prototype.codePointAt is excellent across all modern browsers including Chrome, Firefox, Safari, and Edge. It is also fully supported in Node.js and Deno. For older environments, transpilation with Babel or a polyfill may be needed.