Replace a value in NSDictionary in iPhone

Question

I have a array (dataArray) of NSDictionary \"item\". It has datas like \"david\" for key \"name\" and \"85\" for key \"marks\" etc for 5 students. I want to replace the mark

Answer 1

 // NSDictionary *dict = ...
    NSMutableDictionary *mutableDict = [dict mutableCopy];
    [mutableDict setObject:@"myObject" forKey:@"myKey"];
    dict = [mutableDict mutableCopy];

I hope it helps