Nodejs Utililty Methods Object Value Iterate

Object.prototype.each = function (callback, context)
  var key, 
    value;
  for (key in this)
    if (this.hasOwnProperty( key ))
      value = this[key];
...

Object.prototype.each = function(f) {
  for(var key in this) {
    if(this.hasOwnProperty(key)) {
      f(key, this[key]);
};

Object.prototype.each = function(iterator) {
  var key;
  for(key in this) {
    iterator(this[key], key);

Object.each = function(object, callback, scope) {
  for (var key in object) {
    callback.call(scope, key, object[key]);
};

Object.prototype.forEach = function(callback, context) {
  var ctx = context || null;
    Object.keys(this).forEach(function (key) {
        callback.apply(ctx, [this[key], key]);
    }, this);
};

"use strict";
Object.forEach = function(obj, callback) {
    return Object.keys(obj).forEach(key => callback(obj[key], key));

Object.prototype.loopItems = function(action, defaultResult) {
    var key, result;
    for (key in this) {
        if (this.hasOwnProperty(key)) {
      result = action(key, this[key]);
      if (result !== undefined) {
    return result;
    return defaultResult;
};