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//Array NSArray *array = @[@1, @2]; NSLog(@"index==== %@", array[2]); NSMutableArray *muArray = [[NSMutableArray alloc] initWithObjects:@"1", nil]; NSLog(@"****"); NSLog(@"=======muarray %@", muArray[2]); [muArray replaceObjectAtIndex:3 withObject:@""]; [muArray replaceObjectAtIndex:0 withObject:nil]; [muArray insertObject:@2 atIndex:2]; //Dict NSMutableDictionary *muDict = [NSMutableDictionary dictionaryWithObjectsAndKeys:@"obj", @"key", nil]; [muDict setObject:nil forKey:@"1"]; [muDict setObject:@"1" forKey:nil];