Refactoring

To safely refactor legacy code without altering behavior, apply small incremental changes and run existing tests after each step. This preserves program functionality while improving readability, stability, and maintainability.

Yes, existing tests are required before starting a code refactoring workflow. You must run the test suite after each small incremental change to verify that the program's behavior remains unchanged throughout the process.

The best way to replace complex conditional logic with polymorphism is using the Replace Conditional with Polymorphism technique. This reduces complexity and improves extensibility by aligning with SOLID principles during the refactor.

To improve code quality, use Extract Method to break down long functions and Introduce Parameter Object to group multiple parameters. These refactoring techniques enhance readability while maintaining the original behavior.

Yes, you can apply incremental refactoring techniques across multi-language codebases. The workflow favors small, step-by-step changes with frequent commits and documentation updates to ensure safe improvements.

You should avoid large scale refactoring on a stable project when you lack sufficient test coverage. Safe refactoring requires running tests after each incremental step to prevent unintended behavior changes.