coderetreat @sofia 2012 10 27
TRANSCRIPT
www.mozaicworks.com
We
Adi BolboacaOrganizational & Technical
Trainer & Coach
Stefan KanevRuby on Rails consultant
Why?
Learn through pairingExtend your comfort zone
PracticeExperiment
Learn new practices
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How?
1 day of codingChoose a simple problem
6 pairing partnersOn average 135 minutes of coding
6 different constraintsA lot of fun!
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How it started
CodeMash conference 2009
Gary BernhardtPatrick Welsh
Nayan HajratwalaCorey Haines
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How it started
RepeatableDay-long
Practice the fundamentals of programmingIntense day of coding
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Day structure
15' introduction3 sessions of 45' coding + 15' retro&break
1h lunch3 sessions of 45' coding + 15' retro&break
15' closing circle
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Principles
Language agnosticDo not try to finish the problem
Delete the code after each sessionFocus on practicing
Experiment each sessionHave fun!
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Prerequisites
ComputerCoding environmentTesting framework
Source control (git, svn, etc)
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The four elements of simple design
1) Passes its tests2) Minimizes duplication
3) Maximizes clarity4) Has fewer elements
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Conway's game of life
Having an infinite 2D orthogonal universeBeing given an initial generation called a seedThe following rules are applied simultaneously
A live cell having less than 2 live neighbors diesA live cell having 2 or 3 live neighbors lives A live cell having more than 3 neighbors diesA dead cell having 3 neighbors becomes alive
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First session
Find a pairChoose a programming language
Setup the environmentChoose an entry point for the problem
Start in 5 min
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Conway's game of life
Having an infinite 2D orthogonal universeBeing given an initial generation called a seedThe following rules are applied simultaneously
A live cell having less than 2 live neighbors diesA live cell having 2 or 3 live neighbors lives A live cell having more than 3 neighbors diesA dead cell having 3 neighbors becomes alive
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Single Responsibility Principle
When the method name has “and” or “or” then split the method
No conditionals: ifs, switch, etcNo try/catch
Exactly one assert per testTest one behaviour per test
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Pair programming games
Ping-pong pair programmingEvil codingMute pairing
Beginner’s mind
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Taking Baby Steps1) Initialize source control repository2) Start a timer for 2 minutes3) Write exactly one testa) 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 timer5) Refactora) 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
TDD as if you meant it1) Write exactly one failing test2) Make the test pass by writing implementation code in the test method3) Create a new implementation method by:a) Extracting implementation code to a new method in the test class
b) Moving implementation code into an existing implementation method from the test class
4) Create implementation classes to provide a destination for extracting a method in the test class5) When necessary move implementation methods into implementation classes6) Refactor as required www.mozaicworks.com
Code retreat
Choose your own practice
Decide with your pair in the first 5 minutes
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Closing circle
1) How did you feel? 2) What did you learn today?
3) What will you do differently tomorrow?
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Code retreatWhy?
Learn through pairingExtend your comfort zone
PracticeExperiment
Learn new practices
www.mozaicworks.com
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
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Code retreatExtend your mentoring & training capacity
Accelerate learning through communities of practice
Grow your functional leaders and top talents
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@adibolb