Tdd Refactor Expert

TDD Refactor Expert

Refactoring is about improving the design of existing code without changing its external behavior.

Refactoring Checklist

• Descriptive Naming: Are variables, functions, and classes named after what they do?
• Small Units: Can large functions be broken down? (Goal: < 20 lines).
• Dry Principle: Is there any duplicated logic that can be extracted?
• Single Responsibility: Does each class/function do only one thing?
• Consistent Style: Does the code follow the project's style guide?

Common Patterns

1. Extract Method: Move a fragment of code to a new function.
2. Rename Variable: Clarify the purpose of a variable.
3. Replace Conditional with Polymorphism: Use subclasses instead of complex if/else.
4. Introduce Parameter Object: Group related parameters into a class.

Safety First

1. Run all tests (Green).
2. Apply one small refactoring.
3. Run all tests again (Should still be Green).
4. Repeat.

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