code retreat @agileworks bucharest 7 september 2013
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Bucharest, 7 September 2013
Code retreat
www.mozaicworks.com
www.mozaicworks.com
Me
Adi BolboacaOrganizational & TechnicalTrainer & Coach
Why?
Learn through pairingExtend your comfort zonePracticeExperimentLearn new practices
www.mozaicworks.com
How?
1 day of codingChoose a simple problem6 pairing partnersOn average 135 minutes of coding6 different constraintsA lot of fun!
www.mozaicworks.com
How it started
CodeMash conference 2009
Gary BernhardtPatrick WelshNayan HajratwalaCorey Haines
www.mozaicworks.com
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&break1h lunch3 sessions of 45' coding + 15' retro&break15' closing circle
www.mozaicworks.com
Principles
Language agnosticDo not try to finish the problemDelete the code after each sessionFocus on practicingExperiment each sessionHave fun!
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Prerequisites
ComputerCoding environmentTesting frameworkSource control (git, svn, etc)
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The four elements of simple design
Passes its tests
Minimizes duplication
Maximizes clarity
Has fewer elements
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Poker
A deck of 52 cardsMinimum 2 playersA dealer handles the cardsCards are dealt clockwise around the poker tableEach player bets, adding it clockwise to the potPlayers can change cards, (see game variant)One player with the best cards wins all the potIf no player wins, we have a drawFor draw the winning players split the pot
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First session
Find a pairChoose a programming languageSetup the environmentChoose an entry point for the problemStart in 5 min
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Conway's game of life
A deck of 52 cardsMinimum 2 playersA dealer handles the cardsCards are dealt clockwise around the poker tableEach player bets, adding it clockwise to the potPlayers can change cards, (see game variant)One player with the best cards wins all the potIf no player wins, we have a drawFor draw the winning players split the pot
www.mozaicworks.com
Full Test Coverage
100% test coverage during the whole session
When test is below 100% the facilitator stops you from adding functionalities until the coverage is back at 100% All your tests must contain the assert
You need to install a code coverage tool
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Code retreat
1 hour Lunch
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Taking Baby Steps
Initialize source control repository
Start a timer for 2 minutes
Write exactly one test Timer rings, the test is red, then revert and go to 2)
The test is green before the timer rings, then commit
Restart timer
Refactor Timer rings, the refactoring is not complete then revert and restart
The refactoring is complete before the timer rings, commit and go to 2)
Obs.The timers must run continuously, don't stop to talk!
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Single Responsibility Principle
A method has more functionalities add all in the methods name with use or/and to separate them The method name has and/or then split the method No conditionals: if, switch, etc No try/catch Exactly one assert per test Test one behaviour per test
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No primitives
You have to encapsulate the:
ArraysOther data structures
IntegerStringBooleanOther primitives
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Focus on refactoring
Use naming that reveals intentRename concepts to improve naming (use domain language)Extract duplicate identical chunks of codeExtract methods having the same noun into their classSplit methods containing Or, And in their names
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Closing circle
How did you feel?
What did you learn today?
What will you do differently tomorrow?
www.mozaicworks.com
Code retreat
Why?
Learn through pairingExtend your comfort zonePracticeExperimentLearn 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
Working FAST and Safe with existing code
Code retreat
www.mozaicworks.com
Code retreat
Extend your mentoring & training capacityAccelerate learning through communities of practiceGrow your functional leaders and top talents
http://[email protected]@adibolb