Question

Hello I was trying to remove objects from object array that I have and then create another new object (I’m using $.map() to create the new object )

to remove this object from object(x) it’s object.number has to match one of the number the number in array(y)

this following code works but i only remove the object that has the object.number = 40
DEMO

Code :

   var x =[ //this is the object 
  {name : 'mark' , number : '10' , color:'green'},
  {name : 'jeff' , number : '15' , color:'blue'} ,
  {name : 'joy' , number : '30' , color:'yellow'},
  {name : 'mick' , number : '15' , color:'red'},
  {name : 'mick' , number : '40' , color:'black'}] ; 

      var y =['40','15']; // i need to remove all object.number that match the 
        // number in this array

     var newObject = $.map(x  ,function(index, value){
        for(i in y){
         if(index.number == y[i])
        {return null ; }
       else{
        return index;
            }      
      }

    });
 console.log(newObject);​

the code above only remove the object that has 40 in it’s object.number, how can i make this work?

Answer 1

This is what you want:

var newObject = $.map(x  ,function(index, value){
    for(i in y){
        if(index.number == y[i])
            return null;
    }
    return index;
});
console.log(newObject);​

and jsFiddle. By the way: I think using for(i in y) for arrays is not a good practice (arrays may have other properties). You should use standard:

var l = y.length;
for(var i = 0; i < l; i++){
    /* the other code */
}

Note the length caching.