| name | code-refactoring-dry |
| description | Remove code duplication by extracting shared logic into reusable components. Use when the same logic appears in multiple places. |
Code Refactoring: Don't Repeat Yourself
Remove code duplication you just introduced by refactoring duplicated code to follow the DRY principle.
When to Use This Skill
Use this skill when:
- You notice the same logic appearing in multiple places
- Code has been copied and pasted with minor variations
- A change needs to be made in multiple locations
- Following the "NO DUPLICATED CODE!" rule from code review
Instructions
Step 1: Identify the Duplication
Review the files you have been working on in this session to find:
- Duplicated code patterns
- Duplicated logic or structures
- Copied and pasted blocks with minor variations
Step 2: Clarify Scope (If Needed)
If the duplication is not obvious, ask the user to clarify which specific
duplication they want addressed before proceeding.
Step 3: Refactor
Once the duplication is identified:
- Extract shared logic into reusable functions, classes, or modules
- Replace duplicated code with calls to the shared implementation
- Ensure the refactoring maintains the same functionality
- Update all call sites to use the new shared implementation
Step 4: Verify
After refactoring:
- Run tests if available
- Verify the code still works as expected
- Check that the solution is cleaner and more maintainable
Goal
Eliminate unnecessary duplication while maintaining code clarity and
functionality. The refactored code should be easier to maintain and modify
in the future.
Benefits of DRY
- Single source of truth: Changes only need to be made in one place
- Easier maintenance: Bug fixes propagate automatically
- Reduced risk: Consistency is enforced
- Better testing: Test shared logic once
