Coderetreat @Q42

Slides used during the Coderetreat held at Q42. For more details read the blog https://blog.q42.nl/team-philips-hue-goes-on-code-retreat-d515c699f902

Transcript

1. Coderetreat Mark van Straten @markvanstraten
2. What is it? • Intensive practice event • Focus on fundamentals of software development • Focus on skill improvement • Get out of your comfort zone
3. Things we will practice today • Pair programming • Test Driven Development • Reducing Complexity • Self Documenting Code
4. Schedule • 9:30 - 9:45 - intro • 9:45 - 10:45 - session #1 - 45 mins coding, 15 mins retro • 11:00 - 12:00 - session #2 • Lunch • 13:00 - 14:00 - session #3 • 14:15 - 15:15 - session #4 • 15:30 - 16:30 - MOB programming • 16:30 - Wrap up with some drinks
5. • Find somebody to pair with • `mkdir coderetreat && cd coderetreat && git init` • End of the session `cd .. && rm -rf coderetreat/` • Retrospective How To
6. DELETE ALL CODE AFTER EACH SESSION
7. Conway’s game of life 1. Any live cell with fewer than two live neighbours dies, as if caused by underpopulation. 2. Any live cell with two or three live neighbours lives on to the next generation. 3. Any live cell with more than three live neighbours dies, as if by overpopulation. 4. Any dead cell with exactly three live neighbours becomes a live cell, as if by reproduction.
8. Session #1 - Ping Pong 1. Person A only writes testcase 2. Person B only gets the test to pass 3. Both persons refactor when appropriate 4. Switch roles, repeat “Red ⟼ Green ⟼ Refactor”
9. 4 Rules of simplicity 1. Pass All Tests 2. Clear, Expressive & Consistent 3. Duplicates no behaviour or configuration 4. Minimal Methods, Classes & Modules
10. Session #2 - Baby steps Prep: Take your phone, set timer at 2 minute interval 1. Start timer; Write one test and make it pass before timer runs out a. Success? ⟼ `git commit` Failure? ⟼ `git reset --hard` 2. Start timer; Refactor and make tests pass before timer runs out a. Success? ⟼ `git commit` Failure? ⟼ `git reset --hard` 3. Goto 1. No talking without a running timer!
11. Lunch To be continued after the break...
12. • No talking • Ping pong (write test; implement it) • Most nefarious implementation passing test Session #3 - Mute Evil Coder
13. Session #4 - Dirty Is my last name Implement as dirty and fast as possible. Anything goes. Simply get this thing running!
14. Mob Programming • 1 driver - only translating commands into code • 1 navigator - directing the driver • Rest = researchers helping the navigator • Role change every 5 minutes
15. Mob Task: LCD Digits Your task is to create an LCD string representation of an integer value using a 3x3 grid of space, underscore, and pipe characters for each digit. Each digit is shown below (using a dot instead of a space) ._. ... ._. ._. ... ._. ._. ._. ._. ._. |.| ..| ._| ._| |_| |_. |_. ..| |_| |_| |_| ..| |_. ._| ..| ._| |_| ..| |_| ..| Example: 910 ._. ... ._. |_| ..| |.| ..| ..| |_| https://gist.github.com/crunchie84/4aa7c1c29e94aef4f28a1f3a9efedc92#file-code- kata-lcd-digits-md
16. Closing circle (Retrospective) 1. What, if anything, did you learn today? 2. What, if anything, surprised you today? 3. What, if anything, will you do differently in the future?
17. Resources • https://technologyconversations.com/2013/12/20/test-driven-developm ent-tdd-example-walkthrough/ • https://en.wikipedia.org/wiki/Conway%27s_Game_of_Life • http://coderetreat.org/facilitating/structure-of-a-coderetreat • http://wiki.c2.com/?XpSimplicityRules