I can somewhat relate to the conversations in the article. While I admit that I don't think I used OOP correctly, since I started using more functions instead o

I can somewhat relate to the conversations in the article. While I admit that I don't think I used OOP correctly, since I started using more functions instead of classes (in Python, my primary language), I observed that it has been more convenient to reuse and refactor existing code. Another observation is that it's far easier to read someone else's code if there is no mutation. For eg. I have enrolled for the proglang course[1] on coursera and only yesterday I completed this weeks homework which involves enhancing an already written game of Tetris in Ruby. Major part of the assignment was about reading and understanding the provided code that uses OOP and makes heavy use of mutation. It was quite difficult to understand what one method does without having a picture of the current state of the object, specially with side effecting methods that call other side effecting methods. A few times I had to add print statements here and there to actually understand which one is being when and how many times. While I could score full marks in the end, I am still not confident about completely understanding the code and have a feeling that if I ever need to work with it again, the amount of time it will take to load up everything again into my mind's memory will be equal to what it took for the first time. Of course, one could only make a true comparison by studying an implementation of Tetris written in FP style. But from my experience with reading and writing code in Erlang (for production) and Racket, Clojure (as hobby) I find it relatively easier to study functional code written by others. [1]: https://www.coursera.org/course/proglang https://www.coursera.org/course/proglang