don't be afraid to duplicate

 "I generally follow the rule. Duplicate code until you have at least three examples. Then you can generalise.

So many times if you dedupe code which appears in two places that at first looks like the same code you later realise it is different behaviour and make the "general" function much more complex."

--Clair Blackshaw

Interesting to pair that with my general sense of the kneejerk tendency of some folk to look for a library rather than write a little bespoke code. A good library solves MANY scenarios at once, but since the whole point is kind of NOT understanding the solution as deeply (or taking a lot of time to learn new language of configuration) if it does go wrong you're likely to have less clear sight into how to dig yourself out...