Jay Nabonne (@meaningfulcode)

I think in some ways 1 and 2 are related. You don't want to repeat your sources of truth (or, alternatively, "places where decisions are made"). But you do need to be sure that what you're trying to unify via DRY is actually the same thing. Semantics is key over syntax. Whether code actually looks the same ends up being irrelevant - I have "++i" all over my code. :) And you can have two pieces of code that are doing the same thing that don't actually look alike. (I had a thought relating 1 to 4 - don't store state you can compute = single source of truth - but I went back and realized you had already addressed that.) Great article, by the way!