Function: byteLength()

Return the length in bytes of a string, optionally using a given encoding. Allowed encodings include UTF-8, UTF-16, ASCII, CP1252 and ISO-8859-1.

Syntax

byteLength(string, encoding)

Argument	Type	Description
string	String	The string to be processed.
encoding	String	The character encoding to use.

byteLength('ab\u1e09', 'UTF-8')

Returns 5, which is the length of the string in bytes when using the UTF-8 encoding.

byteLength('ab\u1e09', 'UTF-8')

This expression also returns 5, as the default encoding is UTF-8.