fromCodePoint

fromCodePoint is a method in JavaScript that returns a string created by using the specified sequence of Unicode code points. It provides a way to generate characters from their numeric Unicode values, especially useful for characters outside the Basic Multilingual Plane (BMP), which require surrogate pairs.

The fromCodePoint function was introduced in ECMAScript 2015 (ES6) as a part of the String object. Unlike the older String.fromCharCode method, which only accepts code points up to 65535 (within the BMP), fromCodePoint can handle code points up to 1114111 (0x10FFFF), enabling the creation of characters from supplementary planes directly.

The syntax of fromCodePoint is as follows: String.fromCodePoint(codePoint1, codePoint2, ..., codePointN), where each codePoint is a number representing a Unicode code point. It returns a string composed of the characters corresponding to these code points.

For example, String.fromCodePoint(65, 128512) produces the string “A😊”, where 65 is the code point for the letter 'A', and 128512 is the code point for the emoji. If invalid code points are provided, the method throws a RangeError.

fromCodePoint is commonly used when developers need to work with characters that lie outside the BMP or when generating strings dynamically based on Unicode code points. It simplifies handling of a broader range of Unicode characters compared to its predecessor, String.fromCharCode, enhancing the capabilities of JavaScript's string manipulation functionalities.