New ask Hacker News story: Which programming paradigm had the most impact on you as an engineer and why?

Which programming paradigm had the most impact on you as an engineer and why?
12 by debanjan16 | 19 comments on Hacker News.
If your style of programming or the way in which you approach designing solution to a problem has been severely affected (positively) after learning a programming paradigm, which one is it? Why and how do you think so?