Rails-like number_with_delimiter in javascript

The number_with_delimiter view helper is Rails is nice. I wanted to do the same thing in Javascript. I went to just grab it from Rails and port it to js. But first I googled and found someone had already done exactly that. I took his code and made it extend Number.protoype so you can do something like:

var num = 12345678;
var str = num.number_with_delimiter();
alert(str);

This will show that str is "12,345,678".

Her's my version of the code:

	Number.prototype.number_with_delimiter = function(delimiter) {
	var number = this + '', delimiter = delimiter || ',';
	var split = number.split('.');
	split[0] = split[0].replace(
	/(\d)(?=(\d\d\d)+(?!\d))/g,
	'$1' + delimiter
	);
	return split.join('.');
	};

view raw number_with_delimiter.js hosted with ❤ by GitHub

Based on code from: http://kevinvaldek.com/number-with-delimiter-in-javascript