Fastest way to check if an array contains the same objects of another array

Question

The goal is to compare two arrays as and check if they contain the same objects (as fast as possible - there are lots of objects in the arrays). The arrays cannot be checked

Answer 1

NSArray *filtered = [someArray filteredArrayUsingPredicate:[NSPredicate predicateWithFormat:@"someParamter == %@", paramValue]]];
if (filtered.count) {

}

the main plus is you can use it for any kind of objects: custom, system, NSDictionary. for example I need to know is my UINavigationController's stack contains MySearchResultsVC and MyTopMenuItemsVC or not:

    NSArray *filtered = [self.navigationController.viewControllers filteredArrayUsingPredicate:
                                     [NSPredicate predicateWithFormat:@"class IN %@",
                                      [NSArray arrayWithObjects:
                                       [MySearchResultsVC class],
                                       [MyTopMenuItemsVC class],
                                       nil]]];
if (filtered) {
/* ok, now we can handle it! */
}