objective c - Getting an object from an NSSet

Question

If you can't get an object with objectAtIndex: from an NSSet then how do you retrieve objects?

Answer 1

There are several use cases for a set. You could enumerate through (e.g. with enumerateObjectsUsingBlock or NSFastEnumeration), call containsObject to test for membership, use anyObject to get a member (not random), or convert it to an array (in no particular order) with allObjects.

A set is appropriate when you don't want duplicates, don't care about order, and want fast membership testing.