Coding Dojo - Refactoring Tennis Kata
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This document outlines an exercise for practicing refactoring code through pair programming. Developers pair up to refactor a tennis scoring program, taking turns coding on one shared computer every 7 minutes. The goals are to learn refactoring techniques, improve code design through applying principles like removing duplication and revealing intention, and perform small, tested changes to restructure the code without altering its functionality.
Coding Dojo - Refactoring Tennis Kata
- 3. Coding Dojo Mindset ● We are here to learn ● Safe place outside of work ● Need to slow down ● Focus on doing it right ● Noncompetitive, collaborative, fun environment
- 4. Practice session ● One laptop with a functional dev. env. is connected to a projector ● Two developers pair program on the laptop. The others are watching the code changes. ● Every 7 minutes, one developer leaves the laptop and the next one from the room takes his place.
- 5. 4 rules of simple design ● Passes the tests ● No duplication ● Reveals intention ● Fewer elements
- 6. Code smells “A surface indication that usually corresponds to a deeper problem in the system” Quick to spot: ● bad names ● long method, does too much ● duplication ● dead code, etc.
- 8. Small transformations ● Transformations preserving behavior ● Small, less likely to go wrong ● System is fully working after each change ● Verified by working tests ● Sequence of transformations produce a significant restructuring
- 10. Retrospective ● What did you learn today? ● What happened as expected? ● What surprised you? ● What do you plan to use at work?
- 11. Thank you!