Formats a number with commas, and can shorten large numbers when surpassing a million. Implemented on number prototype,

formatnum.coffee

Number.prototype.formatNum = ( decimal = true, millionify = 1 ) ->
	if @ > 999999 && millionify
		"#{( Math.round( @ / 100000 ) / 10 ).formatNum decimal, millionify - 1}m"
	else
		[n,d] = "#{@}".split '.'
		reg = /(\d+)(\d{3})/
		while reg.test n
			n = n.replace reg, '$1,$2'
		n + if d? and decimal then ( if not decimal then ".#{d.substr( 0 , decimal )}" else ".#{d}" ) else ''