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Code retreat
www.mozaicworks.com
www.mozaicworks.com
Me
Adi Bolboaca
Organizational & Technical
Trainer & Coach
Why?
Learn through pairing
Extend your comfort zone
Practice
Experiment
Learn new practices
www.mozaicworks.com
How?
1 day of coding
Choose a simple problem
6 pairing partners
On average 135 minutes of coding
6 different constraints
A lot of fun!
www.mozaicworks.com
How it started
CodeMash conference 2009
Gary Bernhardt
Patrick Welsh
Nayan Hajratwala
Corey Haines
www.mozaicworks.com
How it started
Repeatable
Day-long
Practice the fundamentals of programming
Intense day of coding
www.mozaicworks.com

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Coderetreat @Turku 2012 10 20

  • 3. Why? Learn through pairing Extend your comfort zone Practice Experiment Learn new practices www.mozaicworks.com
  • 4. How? 1 day of coding Choose a simple problem 6 pairing partners On average 135 minutes of coding 6 different constraints A lot of fun! www.mozaicworks.com
  • 5. How it started CodeMash conference 2009 Gary Bernhardt Patrick Welsh Nayan Hajratwala Corey Haines www.mozaicworks.com
  • 6. How it started Repeatable Day-long Practice the fundamentals of programming Intense day of coding www.mozaicworks.com
  • 7. Day structure 15' introduction 3 sessions of 45' coding + 15' retro&break 1h lunch 3 sessions of 45' coding + 15' retro&break 15' closing circle www.mozaicworks.com
  • 8. Principles Language agnostic Do not try to finish the problem Delete the code after each session Focus on practicing Experiment each session Have fun! www.mozaicworks.com
  • 9. Prerequisites Computer Coding environment Testing framework Source control (git, svn, etc) www.mozaicworks.com
  • 10. The four elements of simple design 1) Passes its tests 2) Minimizes duplication 3) Maximizes clarity 4) Has fewer elements www.mozaicworks.com
  • 11. Conway's game of life Having an infinite 2D orthogonal universe Being given an initial generation called a seed The following rules are applied simultaneously A live cell having less than 2 live neighbors dies A live cell having 2 or 3 live neighbors lives A live cell having more than 3 neighbors dies A dead cell having 3 neighbors becomes alive www.mozaicworks.com
  • 12. First session Find a pair Choose a programming language Setup the environment Choose an entry point for the problem Start in 5 min www.mozaicworks.com
  • 13. Conway's game of life Having an infinite 2D orthogonal universe Being given an initial generation called a seed The following rules are applied simultaneously A live cell having less than 2 live neighbors dies A live cell having 2 or 3 live neighbors lives A live cell having more than 3 neighbors dies A dead cell having 3 neighbors becomes alive www.mozaicworks.com
  • 14. Session constraints at your choice No conditionals (if, while, etc) No loops (for, foreach, while, etc) Four lines of code per method Use only one dot/arrow per line www.mozaicworks.com
  • 15. Taking Baby Steps 1) Initialize source control repository 2) Start a timer for 2 minutes 3) Write exactly one test a) Timer rings, the test is red, then revert and go to 2) b) The test is green before the timer rings, then commit 4) Restart timer 5) Refactor a) Timer rings, the refactoring is not complete then revert and restart b) The refactoring is complete before the timer rings, commit and go to 2) Obs. The timers must run continuously, don't stop to talk! www.mozaicworks.com
  • 16. Code retreat 1 hour Lunch www.mozaicworks.com
  • 17. Pair-programming games Ping-pong Mute paring Evil ping-pong coding Yes, and... www.mozaicworks.com
  • 18. Single Responsibility Principle Precise names split (No and, or) No ifs, switch No try/catch One assert per test Test one behavior per test www.mozaicworks.com
  • 19. Code retreat Choose your own practice Decide with your pair in the first 5 minutes www.mozaicworks.com
  • 20. Closing circle 1) How did you feel? 2) What did you learn today? 3) What will you do differently tomorrow? www.mozaicworks.com
  • 21. Code retreat Why? Learn through pairing Extend your comfort zone Practice Experiment Learn new practices www.mozaicworks.com
  • 22. Contact me ● Remote pair-programming ● Unit testing workshop ● Test driven development workshop ● Clean code workshop ● Refactoring workshop ● Legacy code retreat ● Legacy code workshop ● Code retreat www.mozaicworks.com
  • 23. Code retreat Extend your mentoring & training capacity Accelerate learning through communities of practice Grow your functional leaders and top talents http://www.mozaicworks.com adrian.bolboaca@mozaicworks.com @adibolb