Find Mode of Array in Obj C

modeOfArray.m

NSMutableArray *cardRanks = [[NSMutableArray alloc] init];
for (LDNPlayingCard *card in self.cards) {
    [cardRanks addObject:card.rank];
}
NSCountedSet *bagOfCardRanks = [[NSCountedSet alloc] initWithArray:cardRanks];
NSString *modeOfRanks = [[NSString alloc] init];
NSUInteger highestElementCount = 0;
for (NSString *rank in bagOfCardRanks) {
    if ([bagOfCardRanks countForObject:rank] > highestElementCount) {
        highestElementCount = [bagOfCardRanks countForObject:rank];
        modeOfRanks = rank;
    }
}