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NSMutableDictionary にハッシュでその名前が呼ばれたかどうかを確認する方法

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NSMutableDictionary *t = [[NSMutableDictionary alloc] init ];
NSMutableArray *names = [NSMutableArray array];

// t にインデックスを、その名前が呼ばれたかどうかを判別させるためのマップを作る。

while([self.dummyPerson count] != 3){
    int r = arc4random() % [self.followers count];

    
    NSMutableDictionary *follower = [self.followers objectAtIndex:r];
    NSString *fName = [follower valueForKey:@"screen_name"];
    
    
   // もしも、その名前が存在していなかったら、作る。 
    if (![t valueForKey:fName]){
        [self.dummyPerson addObject:[self.followers objectAtIndex:r]];
    }
    
    [t setValue:@"exist" forKey:[self screenNameAt:r]];
}
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