JavaScript: The Definitive Guide, Fourth Edition

Name

String.charCodeAt( ) — get the nth character code from a string

Availability

JavaScript 1.2; JScript 5.5; ECMAScript v1

Synopsis

                  string.charCodeAt(n)

Arguments

n

The index of the character whose encoding is to be returned.

Returns

The Unicode encoding of the nth character within string. This return value is a 16-bit integer between 0 and 65535.

Description

charCodeAt( ) is like charAt( ) except that it returns the character encoding at a specific location, rather than returning a substring that contains the character itself. If n is negative or greater than or equal to the string length, charCodeAt( ) returns NaN.

See String.fromCharCode( ) for a way to create a string from Unicode encodings.

Bugs

JavaScript 1.2 (as implemented by Netscape 4.0, for example) does not have full support for 16-bit Unicode characters and strings.

See Also

String.charAt( ), String.fromCharCode( )