Nodejs Object Key Get keys_length()

Method Source Code

Object.defineProperty(Object.prototype, 'keys_length', {
    enumerable:false,/*from   w ww.ja  v a 2 s  .c o m*/
    value:function() {
        var size = 0, key;
        for (key in this) {
            if (this.hasOwnProperty(key)) size++;
        }
        return size;
    }
})

Related

1. keyAt(index)

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

2. keys()

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

3. getKeys()

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

4. getOwn(key, defaultValue)

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

5. hasKey(skey)

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

6. contains(key)

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