Refactoring quiz

Test your Refactoring knowledge with a free interactive quiz — 20 questions with answers and explanations. No signup needed to play.

What is the difference between refactoring and simply "rewriting" a piece of code?

1. What is the difference between refactoring and simply "rewriting" a piece of code?
2. What is "Replace Magic Number with Named Constant," as a refactoring technique?
3. What is "duplicated code" as a code smell, and why is the "Don't Repeat Yourself" (DRY) principle relevant to addressing it?
4. What is "Replace Conditional with Polymorphism," as a refactoring technique, generally used to address?
5. Why is having a solid automated test suite generally considered a prerequisite for safely refactoring code?
6. What is a "Primitive Obsession" code smell, and what refactoring commonly addresses it?
7. What is "Extract Method" (or "Extract Function"), as a classic refactoring technique?
8. What is "refactoring," at its core definition (as popularized by Martin Fowler)?
9. What is "Replace Temp with Query," as a refactoring technique, and what tradeoff does it typically address?
10. Why might a team deliberately choose NOT to refactor a specific piece of poorly-structured but working code, even if it exhibits clear code smells?
11. What is a "large class" (or "God object/class") code smell, and why is it generally considered problematic?
12. What is the general risk of refactoring code that has NO automated test coverage at all, and what approach is often recommended in that situation?

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