Question

Can I expect it to go from the start of an array to the end in order? Can’t find anything in the docs about this.

i.e. is

for (id val in array)
{
   NSLog(@"%@", val);
}

always going to print out the same as

for (int i = 0; i < [array count]; ++i)
{
   NSLog(@"%@", [array objectAtIndex:i]);
}

Answer 1

From Apples’ Objective-C documentation on fast enumeration:

For collections or enumerators that have a well-defined order—such as NSArray or NSEnumerator instance derived from an array—the enumeration proceeds in that order, so simply counting iterations will give you the proper index into the collection if you need it.