What Is Refactoring?

Refactoring is the process of restructuring existing code to improve its internal structure, readability, or maintainability without changing its external behavior.

Why it exists

• Code that works can still be hard to understand, extend, or test, especially as a project grows over time
• Without periodic refactoring, small design compromises accumulate and make future changes progressively harder

How to apply it

• Refactor with a solid test suite in place first, so you can verify behavior genuinely hasn't changed
• Keep refactoring changes separate from behavior-changing ones in version control, so each commit is easy to review and, if needed, revert

FAQ

Is refactoring the same as rewriting?

No — refactoring makes incremental, behavior-preserving improvements to existing code, while a rewrite replaces it entirely, which is a much higher-risk undertaking.