phpjs/functions/array/array_sum.js

php.js offers community built php functions in javascript

function array_sum(array) {
  //  discuss at: http://phpjs.org/functions/array_sum/
  // original by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)
  // bugfixed by: Nate
  // bugfixed by: Gilbert
  // improved by: David Pilia (http://www.beteck.it/)
  // improved by: Brett Zamir (http://brett-zamir.me)
  //   example 1: array_sum([4, 9, 182.6]);
  //   returns 1: 195.6
  //   example 2: total = []; index = 0.1; for (y=0; y < 12; y++){total[y] = y + index;}
  //   example 2: array_sum(total);
  //   returns 2: 67.2

  var key, sum = 0;

  if (array && typeof array === 'object' && array.change_key_case) { // Duck-type check for our own array()-created PHPJS_Array
    return array.sum.apply(array, Array.prototype.slice.call(arguments, 0));
  }

  // input sanitation
  if (typeof array !== 'object') {
    return null;
  }

  for (key in array) {
    if (!isNaN(parseFloat(array[key]))) {
      sum += parseFloat(array[key]);
    }
  }

  return sum;
}