convention-rule-of-three

You should refactor duplicate code when a specific logic pattern, such as validation or normalization, appears for the third time across your modules. Extracting shared logic into reusable helpers at this stage enforces DRY principles and prevents code rot.

Reduce repeated setup and validation logic by identifying similar patterns across files and extracting them into shared utility helpers after their third occurrence. This process aligns with DRY principles to improve maintainability and readability across teams.

The Rule of Three is a disciplined refactoring guideline stating you should extract duplicated logic into reusable utilities only after it has been repeated three times. It balances immediate development speed with long-term code quality and maintainability.

Yes, the Rule of Three refactoring approach specifically targets software projects with multiple modules where similar setup, normalization, or validation logic repeats across different files or teams. It enforces extracting shared logic to ensure consistency.

The best way to balance the DRY principle and avoid premature refactoring is to wait until duplicated code appears three times before extracting it. This approach prevents over-engineering while systematically reducing maintenance costs as the project scales.

Delaying refactoring until the third code duplication improves maintainability by allowing the correct abstraction pattern to become clear before extraction. This reduces maintenance costs and prevents code rot by ensuring shared helpers are accurately designed.