String.fromCharCode()

The String.fromCharCode() static method returns a string created from the specified sequence of UTF-16 code units.

Because fromCharCode() is a static method of String, you always use it as String.fromCharCode(), rather than as a method of a String value you created.

Unicode code points range from 0 to 1114111 (0x10FFFF). charCodeAt() always returns a value that is less than 65536, because the higher code points are represented by a pair of 16-bit surrogate pseudo-characters. Therefore, in order to produce a full character with value greater than 65535, it is necessary to provide two code units (as if manipulating a string with two characters). For information on Unicode, see UTF-16 characters, Unicode code points, and grapheme clusters.

Syntax example: String.fromCharCode()