pretty_numbers.js

var App = App || {};

App.Helpers = App.Helpers || {};

(function($) {

	'use strict';

	App.Helpers.Numbers = {

		'pretty_number': function(num, opts){

			var defaultOpts = {
				short: true,
				lowerCase: false,
				addCommas: true,
				round: 2
			};
			
			if (typeof num != "number")
			{
				return "";
			}
			
		 
			if (typeof opts == 'undefined')
			{
				opts = {};
			}
		 
			for (var i in defaultOpts)
			{
				opts[i] = (typeof opts[i] != 'undefined')? opts[i] : defaultOpts[i];
			}
		 
			if (opts.short)
			{
				var decimal_places = Math.floor(Math.log(num) / Math.log(10));
			
				var dec = [{
					'suffix': 'T',
					'divisor': 12
				},{
					'suffix': 'B',
					'divisor': 9
				},{
					'suffix': 'M',
					'divisor': 6
				},{
					'suffix': 'K',
					'divisor': 3
				},{
					'suffix': '',
					'divisor': 0
				}];
				
				for (var i in dec)
				{
					if (decimal_places > dec[i].divisor)
					{
						num = this.round((num / Math.pow(10, dec[i].divisor)), 2 - (decimal_places - dec[i].divisor));
						
						if (num >= 1000 && i > 0)
						{
							decimal_places -= 3;
							num = this.round(num / 1000, 2 - (decimal_places - dec[i - 1].divisor));
							num += dec[i - 1].suffix;
						}
						else
						{
							num += dec[i].suffix;
						}
						
						break;
					}
				}
				
				num = '' + num;
		 
				if (opts.lowerCase)
				{
					num = num.toLowerCase();
				}
			}
			else if (opts.addCommas)
			{
				var decnum = ('' + (this.round(num, opts.round) - Math.floor(num))).substr(2);
				
				var tempnum = '' + Math.floor(num);
				num = '';
				for (var i = tempnum.length - 1, j = 0; i >= 0; i--, j++)
				{
					if (j > 0 && j % 3 === 0)
					{
						num = ',' + num;
					}
					num = tempnum[i] + num;
				}
				
				if (decnum > 0)
				{
					num = num + '.' + decnum;
				}
			}
		 
			return num;
		},

		'commify': function(num){
			return this.pretty_number(num, {'short': false});
		},

		'round': function(num, dec){
			num = num * Math.pow(10, dec);
			num = Math.round(num);
			num /= Math.pow(10, dec);
			return num;
		}

	};

}(jQuery));