Angular filter to display file sizes

angular-filter-bytes.js

app.filter('bytes', function() {
  return function(bytes, precision) {
    if (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));

    return (bytes / Math.pow(1024, Math.floor(number))).toFixed(precision) +  ' ' + units[number];
  }
});

Updated with explicit braces and some whitespace to make it more readable (all of my .js is minified on deploy anyways).