I recently refactored some stable code to improve its readability, but unfortunately, I ended up causing a bug in production. This makes me wonder, when is refactoring actually worth it? What signals or checks should I look for to determine if it's safe or risky to refactor?
3 Answers
Before diving into a refactor, it's crucial to have unit tests in place. They serve as your safety net. I once undertook a significant refactor on a critical system and worked closely with QA throughout the process. Once my tests passed, I felt confident moving forward, and that code not only held up for years but also saved us from costly downtime.
Refactoring can indeed be risky, especially if you don’t have tests. If your motivation is to improve maintainability or tackle technical debt, then it’s generally worth the effort. However, if you're considering changes based solely on personal preference, it might be better to leave it alone.
A big key is ensuring that the functionality doesn’t change during a refactor. If you introduce bugs, that may mean you altered more than just the shape of the code. It’s best to refactor when you’re preparing for new features, as the QA team will be focusing on that area, reducing your risks of surprises later on.
Absolutely! Refactoring should be part of the plan when you're preparing for new developments, so it doesn't become a massive headache later.