For me, I screw around building something, but then “settle in” when I write hardcore unit tests that shore up my knowledge and reinforce my understanding of th

For me, I screw around building something, but then “settle in” when I write hardcore unit tests that shore up my knowledge and reinforce my understanding of the language or framework. Until I do that, and I mean truly do that, I am prone to all sorts of surprises when running my code and have little confidence. Most recently I’ve done this with fp-ts (a functional programming library for typescript) and a wrapper around hledger (a plain text accounting app). Because the later is Haskell, I figured I might open myself up to a rewrite at some point in the future.