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www.mozaicworks.com
Me
Adi BolboacaOrganizational & Technical
Trainer & Coach
2009, First time outside US
Why?
Learn through pairingExtend your comfort zone
PracticeExperiment
Learn new practices
www.mozaicworks.com
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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How to take advantage1. Embrace the freedom of deleting the code
2. Do what you always wanted but couldn't
3. Get out of your comfort zone
4. Pair with strangers in languages you don't know
5. What you learn is your responsibility
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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Session 1: Understand the problem
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
www.mozaicworks.com
Session 2: Full test coverage
100% test coverage during the 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
Install a code coverage tool for your languagewww.mozaicworks.com
Session 3: Object calisthenics
ConceptsUse only one level of indentation per method
Don’t use the else keywordWrap all primitives and strings
Use only one dot per lineDon’t abbreviate
Keep all entities smallDon’t use any classes with more than two instance
variablesUse first-class collections
Don’t use any getters / setters / propertieswww.mozaicworks.com
Session 4: 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
Session 5: Brutal Refactoring Game
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1) Lack of tests2) Name not from domain3) Name not expressing intent4) Unnecessary if5) Unnecessary else6) Duplication of constant7) Method does more than one thing
8) Primitive obsession
9) Feature envy10) Method too long (> 6 lines)11) Too many parameters (> 3)12) Test – not unitary13) Test – setup too complex14) Test – unclear Act15) Test - more than one assert16) Test – no assert17) Test – too many paths
Session 6: Choose a constraint
Each pair to choose their own constraint
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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● Working FAST and Safe with existing
code● 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
http://www.mozaicworks.com
@adibolb
