Removing object from NSMutableArray

Question

I stumbled across the following shortcut in setting up a for loop (shortcut compared to the textbook examples I have been using):

for (Item *i in items){ ...         


        

Answer 1

An Objective-C collection must not be modified during enumeration.

You may use this variant to delete objects from collection:

for (NSInteger i = items.count - 1; i >= 0 ; i--) {
   [items removeObjectAtIndex:i];
}