That criticism looks unfair to me because you did not quote the very next sentence which was relevant: "Gee, that’s complicated! I must be really smart to ha

That criticism looks unfair to me because you did not quote the very next sentence which was relevant: "Gee, that’s complicated! I must be really smart to have written such a function, right? Wrong! I just have a trick!" Seems like the author deliberately picked an example that looks hard but isn't once you understand what he wants to say.