Allow strings to number_to_currency style comma seperate in javascript

any.js

// Allow strings to number_to_currency style comma seperate
String.prototype.commafy = function () {
	return this.replace(/(^|[^\w.])(\d{4,})/g, function($0, $1, $2) {
		return $1 + $2.replace(/\d(?=(?:\d\d\d)+(?!\d))/g, "$&,");
	});
}

// Convenience method for numbers
Number.prototype.commafy = function () {
	return String(this).commafy();
}