Find missing objects in NSSet

Question

I have 2 NSSet's, say SetA and SetB.

SetA has 3 objects. SetA = @[ObjectA, ObjectB, ObjectC];

SetB has 4 objects. SetB = @[ObjectA, ObjectC, ObjectD, ObjectE];

I wish to find out which objects of SetA are missing in SetB. One way I can do it is by iterating over every object in SetA and finding it in SetB.

Question - Is there a quicker way to achieve this in which I don't have to iterate over the entire set. The sets are dynamically populated.

Answer 1

Use NSMutableSet and minusSet to remove elements in another set. The difference is what you're looking for.