Getting objects within array not present in other array

Question

So I have 2 arrays. The first array contains the full list of my objects and the second array contains objects that I got from the first array.

My question is how can I get objects from the first array not present in the second array? So I have tried something like this, in which I create a temporary array. This is my code:

var violators = CSR.ViolatorDetails.violators.slice();
        $.each(collectedFrom, function(idx, obj){
            var obj = Main.Objects.get_object(CSR.ViolatorDetails.violators,obj.violator_id,'violator_id');
            //the object is in CRS.ViolatorDetails.violators    
            if(obj != null){
                var i = CSR.ViolatorDetails.violators.indexOf(obj);
                console.log(i);
                if(i >= 0){
                    console.log('Removing');
                    violators.slice(i,1);
                }
            }
        });

CSR.ViolatorDetails.violators contains the full list of my object. collectedFrom contains objects that I get from the first array. violators is the temporary array I have created.

Your responses would be greatly appreciated.

You can suggest if I can change my approach or just have to change something within my code.

Thanks.