Check duplicate property values of objects in NSArray

Question

I have an NSArray containing objects with a size property.

How can I check if the NSArray has two objects with the same value

Answer 1

Try this code:

NSSet *myset = [NSSet setWithArray:[myarray valueForKey:@"size"]];
int duplicatesCount = [myarray count] - [myset count];

size here is the object property.