Nodejs Array Object Key hasKey()

Method Source Code

Array.prototype.hasKey = function(){ 
  for(i in this){ 
    if(i === arguments[0]) 
      return true; 
  }; /*w w w .  j a v a  2  s . c o  m*/
  return false; 
};

Related

1. by( key, id )

   Array.prototype.by = function( key, id )
     var index = this.length;
     while( index-- )
       if( this[ index ][ key ] == id ) {
         return this[ index ];
   };
   

2. changeItem( key, property, value )

   Array.prototype.changeItem = function( key, property, value )
     var done = false;
       for(var i = 0; i < this.length; i++)
           if( this[i]["id"] == key)
             this[i][property] = value ; done = true;
       return done;
   };
   

3. containsProp(key,str)

   Array.prototype.containsProp = function(key,str) {
     var i = this.length,
       holder = [];
     while (i--) {
       if (this[i][key] === str) {
         holder.push(this[i]);
     return holder;
   ...
   

4. containsReturn(key, value)

   Array.prototype.containsReturn = function(key, value) {
       var i = this.length;
       while (i--) {
           if (this[i][key] === value){
               return i;
       return false;
   

5. getKeys()

   Array.prototype.getKeys = function(){
     var keys = '';
     for(var i in this) keys += ',' + i;
     return keys.substr(1).split(',');
   

6. hasMultipleByKey(key)

   Array.prototype.hasMultipleByKey = function(key) {
       var foundOnce = false;
       var i = this.length - 1;
       while (i >= 0) {
           if (this[i].getKey() === key) {
               if (foundOnce)
                   return true;
               else
                   foundOnce = true;
   ...
   

7. keys()

   Array.prototype.keys = function keys () {
     return new ArrayIterator(this, 'key');
   };
   

8. notIn( key, array )

   Array.prototype.notIn = function( key, array )
       return this.filter( function(element)
           var flag = true;
           for(var i = 0; i < array.length; i++)
               if( element[key] == array[i][key]) flag = false;
           return flag;
       });
   };
   

9. objectIndex(key,value)

   Array.prototype.objectIndex = function(key,value) {
     for(var i = 0, len = this.length; i < len; i++) {
         if (this[i][key] === value) return i;
     return -1;