each.js

var each = function (Array) {"use strict";
  /*! all you need to `each(obj, cb [,context])`
   * @author      WebReflection
   * @license     WTFPL - http://en.wikipedia.org/wiki/WTFPL
   * @gist        https://gist.github.com/2294934
   */
  var
    toString = {}.toString,
    hasOwnProperty = {}.hasOwnProperty,
    array = toString.call([]),
    NL = typeof NodeList != "undefined" ? NodeList : Array,
    isArrayLike = function isArrayLike(obj) {
      return  obj != null &&
              (
                obj instanceof Array ||
                obj instanceof NL
              ) ||
              toString.call(obj) == array ||
              (
                (
                  (t = typeof obj) != "function" &&
                  t != "string"
                ) &&
                typeof(l = obj.length) == "number" &&
                l === ~~l
              )
      ;
    },
    forEach = [].forEach || function forEach(callback, context) {
      for (var
        obj = this, i = 0, length = obj.length;
        i < length;
        ++i
      )
        i in obj && callback.call(context, obj[i], i, obj)
      ;
    },
    t, l
  ;
  return function each(obj, callback, context) {
    if (isArrayLike(obj))
      forEach.call(obj, callback, context)
    ;
    else for (var key in obj)
      hasOwnProperty.call(obj, key) && callback.call(context, obj[key], key, obj)
    ;
  };
}(Array);

Would probably use Object.entries(...).forEach now