Coderetreat Slides on the Global Day of Coderetreat, Bucharest, December 2013
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The document describes a code retreat, which is a day-long event where developers improve coding skills through test-driven pair programming. Participants rotate through multiple pairing partners and focus areas, coding simple problems under different constraints for around 45 minutes at a time. The goal is to learn techniques like refactoring, naming conventions, and test-driven development in a fun, intensive practice environment. Breaks between sessions allow for retrospection and switching partners and problems.
Coderetreat Slides on the Global Day of Coderetreat, Bucharest, December 2013
- 2. Me Adi Bolboaca Organizational & Technical Trainer & Coach www.mozaicworks.com
- 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 Ping-pong pair-programming Option 1: evil coding Option 2: silent pairing Option 3: beginner's mind 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. Programming by Wishful Thinking 1.Find a real-life scenario from top to bottom 2.Write an acceptance test on the scenario 3.Write the first unit test at the top 4.Whenever your test or implementation needs something, create a stub 5.Go on writing next test until you reach the bottom layer 6.Only implement the stubs that you need for your vertical slice 7.Make the real-life scenario test pass 8.Write the next real-life scenario www.mozaicworks.com
- 15. Only one decision at a time 1.Introduce only one notion at a time 2.Write down what notions you introduced 3.Note down the steps/tests you took 4.Write down which were the decisions you needed to revert from www.mozaicworks.com
- 16. Code retreat 1 hour Lunch www.mozaicworks.com
- 17. Tell don't ask The internal state of a class is not accessible A method call sends all the data needed to retrieve an answer Each class computes the output using only its internal state www.mozaicworks.com
- 18. Focus on refactoring Use naming that reveals intent Rename concepts to improve naming (use domain language) Extract duplicate identical chunks of code Extract methods having the same noun into their class Split methods containing Or, And in their names 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 ● ● Working FAST and Safe with existing code 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