Comment by fenomas

Nice to have these all collected nicely and sharable. For the amusement of HN let me add one I've become known for at my current work, for saying to juniors who are overly worried about DRY:

> Fen's law: copy-paste is free; abstractions are expensive.

edit: I should add, this is aimed at situations like when you need a new function that's very similar to one you already have, and juniors often assume it's bad to copy-paste so they add a parameter to the existing function so it abstracts both cases. And my point is: wait, consider the cost of the abstraction, are the two use cases likely to diverge later, do they have the same business owner, etc.