locutus/php/array/array_product.js

Locutus other languages' standard libraries to JavaScript for fun and educational purposes

'use strict';

module.exports = function array_product(input) {
  // eslint-disable-line camelcase
  //  discuss at: https://locutus.io/php/array_product/
  // original by: Waldo Malqui Silva (https://waldo.malqui.info)
  //   example 1: array_product([ 2, 4, 6, 8 ])
  //   returns 1: 384

  var idx = 0;
  var product = 1;
  var il = 0;

  if (Object.prototype.toString.call(input) !== '[object Array]') {
    return null;
  }

  il = input.length;
  while (idx < il) {
    product *= !isNaN(input[idx]) ? input[idx] : 0;
    idx++;
  }

  return product;
};
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