To compare two strings in the current locale, use the localeCompare() method. It returns 0 if the strings are equal, -1 if string1 is sorted before string2, and 1 if string1 is sorted before string2.
Example
You can try to run the following code to learn how to compare two strings in the current locale in JavaScript −
<!DOCTYPE html>
<html>
<body>
<script>
var a = "klm";
var b = "qrs";
document.write("Character: "+a.localeCompare(b));
</script>
</body>
</html>