//NSString ....    NSString *str1 = @"str1";    NSLog(@"str %@",str1);        //NSArray    NSArray *arr1 = @[@"one",@"two",@"three",@"four",@YES,@(NO),@1,@(2)];    NSLog(@"count %d",arr1.count);    NSLog(@"value %@",arr1[4]);        //NSMutableArray    NSMutableArray *arr2 = [@[@"oo",@"xxx"] mutableCopy];    /*[@[@(1), @(2), @(3), @(4), @(5), @(6), @(7), @(8), @(9), @(10)] mutableCopy]     NSMutableArray *arr2 = [@[     [@{@"name" : @"Cersei Lannister", @"title" : @"Queen of the Seven Kingdoms", @"isFavourite" : @NO, @"image" : @"cersei" } mutableCopy],     [@{@"name" : @"Jaime Lannister", @"title" : @"Kingslayer", @"isFavourite" : @NO, @"image" : @"jaime" } mutableCopy],     [@{@"name" : @"Joffrey Baratheon", @"title" : @"The Illborn", @"isFavourite" : @NO, @"image" : @"joffrey" } mutableCopy],     [@{@"name" : @"Tyrion Lannister", @"title" : @"The Halfman", @"isFavourite" : @NO, @"image" : @"tyrion" } mutableCopy],     [@{@"name" : @"Tywin Lannister", @"title" : @"Lord of Casterly Rock", @"isFavourite" : @NO, @"image" : @"tywin" } mutableCopy]]     mutableCopy];     */    [arr2 addObject:@"two"];    NSLog(@"count %d",arr2.count);    NSLog(@"value %@",arr2[1]);        //NSDictionary    NSDictionary *dic1 = @{@"key1":@"value1",@"key2":@"value2"};    NSLog(@"count %d",dic1.count);    NSLog(@"value %@",dic1[@"key1"]);        //NSMutableDictionary    NSMutableDictionary *dic2 = [@{@"key1":@"value1",@"key2":@{@"key22":@"value22",@"key222":@"value222"}}                                 mutableCopy];    NSLog(@"count %d",dic2.count);    NSLog(@"value %@",dic2[@"key2"][@"key222"]);