Objective-C 2.0 for ... in loop, using Fast Enumeration

loop.m

    NSArray *array = @[
                            @"hello",
                            @"world",
                            [NSNull null],
                            [NSNumber numberWithInt:123],
                            [NSNumber numberWithFloat:123.456]
                      ];
    
    for (id obj in array) {
        NSLog(@"the obj is %@", obj);
    }