dry-refactor

Eliminate duplicate code by identifying repeated logic patterns—like numbered variables (data1, data2) or parallel function names—then apply refactoring techniques such as Extract Function or Extract Variable to consolidate shared behavior into reusable abstractions.

Core techniques include Extract Function, Extract Variable, Parameterize, Extract Class, Polymorphism, and Strategy Pattern. Choose based on coupling and scope; Extract Function works for isolated blocks, while Polymorphism suits diverging behavior across classes.

Apply the Rule of Three: refactor when identical logic appears three or more times. Avoid premature abstraction for coincidental similarities or one-off duplications; refactor incrementally and validate with tests after each step.

Watch for numbered variables (data1, data2), similarly named functions (handleXClick patterns), magic numbers, and parallel logic blocks. These smells signal opportunities to extract shared behavior and improve maintainability.

Yes. Extract incrementally—apply one refactoring technique at a time, then validate with tests after each step. This staged approach catches issues early and ensures your changes maintain existing behavior.