this post was submitted on 21 Apr 2024
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Programming
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There’s bad code and then there’s worse code. “Best practices” might help you to avoid writing worse code.
Good code might appear occasionally. In the rare event when it’s also useful, people will start to have opinions about what it should do. Suddenly requirements change and now it’s bad code.
TBH I am not sure about this. I have seen many "Best practices" make code worst not better. Not because the rules themselves are bad but people take them as religious gospel and apply them to every situation in hopes of making their code better without actually looking at if it is making their code better.
For instance I see this a lot in DRY code. While the rules themselves are useful to know and apply they are too easily over applied removing any benefit they originally gave and result in overly abstract code. The number of times I have added duplication back into code to remove a layer of abstraction that was not working only to maybe reapply it in a different way, often keeping some duplication.
This only leads to bad code when people get to afraid to refactor things in light of the new requirements.Which sadly happens far to often. People seem to like to keep what was there already and follow existing patterns even well after they are no longer suitable. I have made quite a lot of bad code better by just ripping out the old patterns and putting back something that better fits the current requirements - quite often in code I have written before and others have added to over time.
DRY is one of the most misunderstood practices. If you read pragmatic programmer (where DRY was coined), they make it clear that DRY doesn’t mean “avoid all repetition at all cost”. Just because two pieces of code look identical doesn’t necessarily mean they are the same. If they can grow independently of each other, then they’re not repetitions according to DRY and should be left alone.
Yup, and that is because people only ever lean DRY coding by its name. It is never really what it originally meant, when to use it and more importantly when not to use it. So loads of people apply it religiously and over use it. This is true of all the popular catchy named methodologies/principals etc.
The damning thing about DRY is that it’s so satisfying. It’s like a fun little puzzle.