code-refactor

Refactoring existing code to improve readability requires making incremental changes while strictly preserving external behavior and continuously validating that all tests pass to ensure no functional changes are introduced.

Common code smells to identify before refactoring include long functions, code duplication, and deep nesting, which negatively impact code quality, readability, and long-term maintainability of the software.

No, an incremental refactoring process strictly focuses on behavior preservation and quality improvements; any discovered bugs are documented separately to ensure no functional changes or bug fixes are introduced during the refactoring.

To ensure behavior preservation during refactoring, you must guide incremental changes with continuous test validation, analyzing code for smells and verifying that all tests continue to pass after each modification.

The best way to reduce code duplication and deep nesting is to systematically refactor the codebase through small, verifiable incremental changes that improve maintainability while strictly preserving the original external functionality.

You should not use a strict refactoring approach when you need to fix bugs or alter external behavior, because this process strictly preserves original functionality and focuses entirely on internal code quality and maintainability improvements.