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){ ... }

As opposed to the longer format:

for (NSInteger i = 0; i < [items count]; i++){ ... } //think that's right

If I’m using the shorter version, is there a way to remove the item currently being iterated over (ie ‘i’)? Or do I need to use the longer format?

Answer 1

You cannot remove objects from array while fast-enumerating it:

numeration is “safe”—the enumerator
has a mutation guard so that if you
attempt to modify the collection
during enumeration, an exception is
raised.

Anyway why do you need to change you container while enumerating it? Consider storing elements that need to be deleted and remove them from your container using removeObjectsInArray: or removeObjectsAtIndexes: method.