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Debugging
(lemmy.ml)
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this post was submitted on 20 Nov 2024
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I find a good approach to getting better at programming is to reflect on the projects you've done and try to identify patterns that got you into trouble. Then you can try doing things differently next time, and eventually you end up settling on a style that works for you. At the end of the day it's really just practice. The one key thing I've learned to focus on is reducing the operating context I need to have when reading the code. Once the context becomes too big to keep in your head, then trouble starts. So breaking things up aggressively into small components you can reason about in isolation tends to be the best way to write reliable code you can maintain over time.
This is so true. Something that has really improved my coding has been having a linter that whines to me about assignment branch condition size. Compared with learning how to properly stub methods in tests it has helped me break tasks down into simple manageable chunks with little room for error.
I find it's also helpful to explicitly think about high level flow in the code. There are typically two types of code in an application. There's routing code that figures out where the payload needs to go, and then there's the code that actually cares about the content of the payload. The routing code can be thought of as sort of a railway where you ship packages around. When a package gets to a destination then you pass it to the code that knows what do do with it.
Nowadays, I really like to draw it out as a state machine before I start working on the code. When you just start coding, it's very easy to focus on the happy path and then you end up having to start kludging handling of exceptional cases as they come up. When you sketch out the state machine, it forces you to consider the error cases up front. You don't have to handle them right away, but the design should account for them at the very least. This is an excellent read about this approach https://shopify.engineering/17488160-why-developers-should-be-force-fed-state-machines