I tried to code using the functional library by applying the concepts learned from the previous lecture, but the auxiliary function became longer and the imperative code was simply moved to the auxiliary function. I couldn't shake the feeling that the imperative code was just changed to a function with control statements in Go. After listening to this lecture, I think it was a lecture that filled in the 2% that was lacking when I just listened to the previous lecture and blindly rushed into coding, such as looking at map, filter, and reduce from a different perspective, wrapping iterables/iterators with the above functions, safe function composition through monads, and techniques for extracting highly reusable functions and abstracting them for continued use. I haven't fully digested this lecture yet, but I will study it by listening to it over and over again. Thank you for the great lecture.