AngularJS byte format filter

bytes.filter.js

"use strict";
(function () {
    angular.module("backOffice")
        .filter('bytes', function () {
            return function (bytes, precision) {
                if (bytes === 0 || isNaN(parseFloat(bytes)) || !isFinite(bytes)) return '-';
                if (typeof precision === 'undefined') precision = 1;

                var units = ['bytes', 'kB', 'MB', 'GB', 'TB', 'PB'],
                    number = Math.floor(Math.log(bytes) / Math.log(1024)),
                    val = (bytes / Math.pow(1024, Math.floor(number))).toFixed(precision);

                return (val.match(/\.0*$/) ? val.substr(0, val.indexOf('.')) : val) + ' ' + units[number];
            }
        });
})();