How to search an NSSet or NSArray for an object which has an specific value for an specific property?

NSPredicate *predicate = [NSPredicate predicateWithFormat:@"type == %@", @"standard"];
NSArray *filteredArray = [myArray filteredArrayUsingPredicate:predicate];
id firstFoundObject = nil;
firstFoundObject =  filteredArray.count > 0 ? filteredArray.firstObject : nil;

NB: The notion of the first found object in an NSSet makes no sense since the order of the objects in a set is undefined.