Nodejs Object Key Get isEmpty()

Method Source Code

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;
    }/*from   w w  w. j av a2 s. c om*/

    return true;
};

Related

1. getKeys()

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

2. getOwn(key, defaultValue)

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

3. hasKey(skey)

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

4. contains(key)

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

5. empty()

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