NSMutableArray check if object already exists

Question

I am not sure how to go about this. I have an NSMutableArray (addList) which holds all the items to be added to my datasource NSMutableArray.

I now

Answer 1

I found a solution, may not be the most efficient of all, but atleast works

NSMutableArray *add=[[NSMutableArray alloc]init];

for (Item *item in addList){
        if ([appDelegate.list containsObject:item])
            {}
        else
            [add addObject:item];
}

Then I iterate over the add array and insert items.