Nodejs Utililty Methods Object Key Get

Object.prototype.keyAt = function(index){
  return Object.keys(this)[index];

Object.prototype.keys = function() {
    var keys = [];
    $.each(this, function(key, value) {
        keys.push(key);
    });
    return keys;
};

Object.defineProperty(Object.prototype, 'keys_length', {
    enumerable:false,
    value:function() {
        var size = 0, key;
        for (key in this) {
            if (this.hasOwnProperty(key)) size++;
        return size;
})

Object.prototype.getKeys = function(){
  var keys = [];
  for (var key in this) {
    if (this.hasOwnProperty(key)) {
      keys.push(key);
  return keys

Object.prototype.getOwn = function(key, defaultValue) {
    if (this.hasOwnProperty(key)) {
  return this[key];
    else {
  return defaultValue;
};

Object.prototype.hasKey = function(skey){
  for (var key in this) {
    if (this.hasOwnProperty(key)) {
      if(key==skey){
        return true
  return false
...

Object.prototype.contains = function (key) {
    return this.hasOwnProperty(key);
};

Object.prototype.empty = function() {
  return Object.keys(this).length <= 0;

Object.prototype.isEmpty = function() {
    if (this == null) return true;
    if (this.length > 0)    return false;
    if (this.length === 0)  return true;
    for (var key in this) {
        if (hasOwnProperty.call(this, key)) return false;
    return true;
};
...