Coderetreat - Practice to Master Your Crafts


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Coderetreat is a one day intense workshop for software developers for imporving their development skills by practicing. This is the material I presented at the beginning of coderetreat I facilitated on May 2014.

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Coderetreat - Practice to Master Your Crafts

  1. 1. Code Retreat Lemi Orhan Ergin Agile Software Craftsman practice to master your crafts
  2. 2. Agile Software Craftsman Passionate Developer and Coach Sony & GittiGidiyor/eBay LEMİ ORHAN ERGİN @lemiorhan @lemiorhan
  3. 3. like to work alone feel safe to work on confort zone have to focus on daily work skip writing tests cannot find time to experiment not willing to learn new practices do not think about design focus on gettings things done over-engineer do not refactor Developers
  4. 4. have to improve their craft Developers
  5. 5. is the best way how we improve our craft Practicing
  6. 6. How to Practice Challenge Repeat Feedback again and again and again and again
  7. 7. How to Practice No Pressure do not complete the task
 but master it
  8. 8. practicing ! mastering Code Retreat is about and
  9. 9. writing the perfect code Code Retreat is about
  10. 10. learning through pairing extending your confort zone no pressure of daily work experimenting learning new practices thinking deeply about design building structures simple developing whenever required refactoring Code Retreat is about
  11. 11. 1 day coding 45 minutes sessions Pair programming Test first development Different partners on each session Different constraints Format
  12. 12. Schedule Retrospective Break Closing Ceramony Coding 45 10 5 5 5 5 5 10 10 10 10 15 45 45 45 45 45 Lunch
  13. 13. History The idea was spawned at CodeMash Conference’09 ! The owners of the idea Gary Bernhardt Patrick Welsh Nayan Hajratwala Corey Haines ! First was held on January 24, 2009 Corey Haines
  14. 14. Global Day of Code Retreat 2000+ developers 150+ locations 20 timezones 16 hours of coding 6 continents Coderetreat Community Network 14th of December
  15. 15. Code generation is not important Generate code by thinking the design Focus on naming test cases Focus on Red/Green/Refactor cycle Why Repeating?
  16. 16. You are not your code Learn to go slower Focus on being better Do not think about finishing It’s all about practicing Why Deleting?
  17. 17. Language agnostic Do not try to complete Focus on practicing Write code than open to accept change Follow 4 rules of simple design Delete code after each session Have fun Principles
  18. 18. SOLID Principles Law of Demeter Design Patterns 4 Rules of Simple Design Design Guidelines
  19. 19. Simple Design Simple design in one that is easy to change. We don’t know exactly what is going to need to change We’ll never be more ignorant than we are at this moment
  20. 20. Simple Design Tests pass 4 Rules of “Tests pass” can be a significant factor in making changes. If you have to ask how fast your test suite should be, it should be faster 1
  21. 21. Simple Design Express Intent 4 Rules of Paying attention to the names and how your code expresses itself is the key. 2
  22. 22. Simple Design No Duplication (DRY) 4 Rules of It’s not about code duplication, it’s about knowledge duplication. Don’t repeat yourself. Every piece of knowledge should have one and only one representation. 3
  23. 23. Simple Design Small 4 Rules of Has fewer classes, modules, packages. Any not- used code should be deleted. You should also check missing or duplicate abstractions. Over- extraction should also be not allowed. 4
  24. 24. “Putting an Age-Old Battle to Rest” by Joe Rainsberger The Simple Design Dynamo
  25. 25. TDDWrite exactly one new test1 2 Run the test to make sure it fails 3 Write least amount of code to make the test pass 4 Refactor to remove duplication 5 Repeat the process Test Driven Development Test Driven Design Test First Development
  26. 26. Zero-player game Cellular automation system Devised by John Horton Conway Evolution is determined by initial state Each cell can be alive or dead Conway’s Game of Life Problem to solve:
  27. 27. Each cell has 8 neighbours and follows 3 rules 1 2 3 4 567 8
  28. 28. Any live cell with fewer than 2 live neighbours dies of loneliness Rule 1
  29. 29. Any live cell with more than 3 live neighbours dies of overcrowding Rule 2
  30. 30. Any dead cell with exactly 3 live neighbours comes to life of warmth Rule 3
  31. 31. Avoid to use primitives Avoid to use conditional conditions (if, ?:, switch) Avoid to use loops (while, for) All methods return void Max 5 lines of code per method Verbs instead of nouns Ping pong programming Mute ping pong programming Swap computers Do not use mouse Variations
  32. 32. ENJOYremember whatever you do do not forget to Joe O'Brien and Jim Weirich while doing ruby code review
  33. 33. sessions let the begin We select 6 activities amoung the activities list after checking TDD and pair programming experiences of the attendees. Every coderetreat has its own set of activities.
  34. 34. No constraints Do your best
  35. 35. Ping-pong pair programming
  36. 36. No primitives Use only immutable objects
  37. 37. No primitives No conditionals Max 5 lines of code
  38. 38. No way to return any value Verbs instead of Nouns
  39. 39. Mute ping-pong
  40. 40. What, if anything, did you learn today? What, if anything, surprised you today? What, if anything, will you do differently? closing
  41. 41. The only thing we truly know about software development is that we can expect changes to our system. Through concrete examples, let's explore ways to build flexible, adaptable software systems by better understanding Kent Beck's 4 Rules of Simple Design. Book from Corey Haines Published at LeanPub on 2014
  42. 42. Coderetreat Community Network Facilitating the Global Day of Coderetreat 2013 in Amsterdam How to organize a code retreat Coderetreat Facilitator Training Understanding the 4 Rules of Simple Design
  43. 43. Lemİ orhan ergİn Founder & Author @ @lemiorhan @lemiorhan @lemiorhan @lemiorhan agile software craftsman Turkish blog about agile development Official site having personal information