JavaScript String localeCompare() Method

localeCompare()The method compares two strings in the current language environment.

This method returns a number that indicates whether the string is located before, after, or equal to compareString in the sorting order.

Syntax:

string.localeCompare(compareString)

Example

var a = 'AB';
var b = 'CD';
var c = a.localeCompare(b);

All browsers fully support the localeCompare() method:

Method
localeCompare()	is	is	is	is	is

Parameter	Description
compareString	The string compared with the reference string

Return value:	a number indicating whether the reference string is in the sorting ordercompareStringbefore, after, orwithIdentical. return one of the following values: -1if the reference string iscompareStringsorted before if two strings are equal, then 0 if the reference string iscompareStringsorted afteris1
JavaScript Version:	ECMAScript 1