objective c - Check that the contents of one NSArray are all in another array

Question

I have one NSArray with names in string objects like this:@[@"john", @"smith", @"alex", @"louis"], and I have another array that contains lots of names. How can I check that all the objects in the first array are in the second?

Answer 1

NSSet has the functionality that you are looking for.

If we disregard performance issues for a moment, then the following snippet will do what you need in a single line of code:

BOOL isSubset = [[NSSet setWithArray: array1] isSubsetOfSet: [NSSet setWithArray: mainArray]];