NSArray - check if objects are in an array?

Question

I have 2 arrays. One is a large static group of 600 objects, the other is a small varying group of 10 objects.

I want to take any common objects between the two grou

Answer 1

The easiest (but not necessarily fastest (?)) way would be something like

NSMutableSet *intersection = [NSMutableSet setWithArray:smallArray];
[intersection intersectSet:[NSSet setWithArray:bigArray];
NSArray *result = [NSArray arrayWithSet:intersection];

You'll have to sort the resulting array again, however.