Does fast enumeration evaluate the collection expression on every iteration?

Question

If I have the following piece of code:

        for (UIView *view in [myArray copy])

Does that mean that I'm sending the copy message to myArray on every iteration, or Objective-C is smart enough to do copy only once, and use it for the whole loop?

Answer 1

It isn't a matter of "smart", but yes, the expression [myArray copy] is evaluated once up front.