index.js

//from.js
// Production steps of ECMA-262, Edition 6, 22.1.2.1
if (!Array.from) {
  Array.from = (function () {
    var toStr = Object.prototype.toString;
    var isCallable = function (fn) {
      return typeof fn === 'function' || toStr.call(fn) === '[object Function]';
    };
    var toInteger = function (value) {
      var number = Number(value);
      if (isNaN(number)) { return 0; }
      if (number === 0 || !isFinite(number)) { return number; }
      return (number > 0 ? 1 : -1) * Math.floor(Math.abs(number));
    };
    var maxSafeInteger = Math.pow(2, 53) - 1;
    var toLength = function (value) {
      var len = toInteger(value);
      return Math.min(Math.max(len, 0), maxSafeInteger);
    };

    // The length property of the from method is 1.
    return function from(arrayLike/*, mapFn, thisArg */) {
      // 1. Let C be the this value.
      var C = this;

      // 2. Let items be ToObject(arrayLike).
      var items = Object(arrayLike);

      // 3. ReturnIfAbrupt(items).
      if (arrayLike == null) {
        throw new TypeError('Array.from requires an array-like object - not null or undefined');
      }

      // 4. If mapfn is undefined, then let mapping be false.
      var mapFn = arguments.length > 1 ? arguments[1] : void undefined;
      var T;
      if (typeof mapFn !== 'undefined') {
        // 5. else
        // 5. a If IsCallable(mapfn) is false, throw a TypeError exception.
        if (!isCallable(mapFn)) {
          throw new TypeError('Array.from: when provided, the second argument must be a function');
        }

        // 5. b. If thisArg was supplied, let T be thisArg; else let T be undefined.
        if (arguments.length > 2) {
          T = arguments[2];
        }
      }

      // 10. Let lenValue be Get(items, "length").
      // 11. Let len be ToLength(lenValue).
      var len = toLength(items.length);

      // 13. If IsConstructor(C) is true, then
      // 13. a. Let A be the result of calling the [[Construct]] internal method 
      // of C with an argument list containing the single item len.
      // 14. a. Else, Let A be ArrayCreate(len).
      var A = isCallable(C) ? Object(new C(len)) : new Array(len);

      // 16. Let k be 0.
      var k = 0;
      // 17. Repeat, while k < len… (also steps a - h)
      var kValue;
      while (k < len) {
        kValue = items[k];
        if (mapFn) {
          A[k] = typeof T === 'undefined' ? mapFn(kValue, k) : mapFn.call(T, kValue, k);
        } else {
          A[k] = kValue;
        }
        k += 1;
      }
      // 18. Let putStatus be Put(A, "length", len, true).
      A.length = len;
      // 20. Return A.
      return A;
    };
  }());
}

//reduce.js
/*
Source of the polyfill: 
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/reduce#Polyfill

*/

if(!Array.prototype.reduce){
    
    Array.prototype.reduce = function(callback) {
        'use strict';
        if (this == null) {
        throw new TypeError('Array.prototype.reduce called on null or undefined');
        }
        if (typeof callback !== 'function') {
        throw new TypeError(callback + ' is not a function');
        }
        var t = Object(this), len = t.length >>> 0, k = 0, value;
        if (arguments.length == 2) {
        value = arguments[1];
        } else {
        while (k < len && !(k in t)) {
            k++; 
        }
        if (k >= len) {
            throw new TypeError('Reduce of empty array with no initial value');
        }
        value = t[k++];
        }
        for (; k < len; k++) {
        if (k in t) {
            value = callback(value, t[k], k, t);
        }
        }
        return value;
    };
}
//assign.js
/**
 * https://gist.github.com/WebReflection/10404826
 */
/* eslint no-use-before-define: off */

try {
  Object.assign({}, {foo: 'bar'});
}catch(err) {
  // failed: so we're in IE8
  (function() {
    Object.assign = (function(has) {
      'use strict';
      return assign;
      function assign(target, source) {
        for (var i = 1; i < arguments.length; i++) {
          copy(target, arguments[i]);
        }
        return target;
      }
      function copy(target, source) {
        for (var key in source) {
          if (has.call(source, key)) {
            target[key] = source[key];
          }
        }
      }
    }({}.hasOwnProperty));
  }());
}