CoreTextLabel * label = (id)@"String"; // Assign object of wrong type
    if (AF_VALID(label, CoreTextLabel)) 
    {
        ZLog(@"%p is valid", label);
    }
    else
    {
        ZLog(@"%p is not valid", label);
    }
	
    NSArray * array = @[@"abc", @"def"]; // Array with two items
    if (AF_VALID_NOTEMPTY(array, NSArray)) 
    {
        ZLog(@"%p is valid and contains at least one object", label);
    }
    else
    {
        ZLog(@"%p is not valid or empty", label);
    }

    // This will print item at index 1
    ZLog(@"Object at index '%d' has value '%@'", 1, AF_ARRAY_OBJECT_AT_INDEX(array, 1));

    // This will print 'nil' for invalid index 99
    ZLog(@"Object at index '%d' has value '%@'", 99, AF_ARRAY_OBJECT_AT_INDEX(array, 99));