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Extreme Programming Live
WeActuallyBuildStuffJohannes Brodwall
Exilesoft Chief scientist
@jhannes
Guest starring: Andrej Slivko
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Goal• To have fun now!
• For you to have fun now!• For you to have fun later
(stretch goal)
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After this talk• You may find desire to train with TDD
• You may pair program sometimes• You may think of some ways to improve the
way you work
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1. Waddayamean«extreme programming»
2. What to look for3. Demonstration 4. Discussion5. Conclusion
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«Extreme programming»?
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Is it better to• Do the thing right?
• Do the right thing?
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It is better to• Do the thing right, then to
• Do the right thing• (first)
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Ping pong
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Ingredience #1:Pair programming
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Ingredience #2:Test driven
development
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Failing test
Write code
Failing test
Write code
Failing test
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Ingredience #3:
Refactoring
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Failing test
Write code
Failing test
Write code
Failing test
Refactor code and tests
Refactor code and tests
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Put together
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Failing test
Write code
Failing test
Write code
Failing test
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Failing test
Write code
Failing test
Write code
Failing test
Refactor code and tests
Refactor code and tests
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Failing test
Write code
Failing test
Write code
Failing test
Refactor code and tests
Refactor code and tests
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Demonstration
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What to watch for?
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If you’re a project manager
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If you’re an architect
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If you’re a developer
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If you’re neither
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Please:• Talk about what you see to the person
next to you (whisper)•Tweet to @jhannes
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Demonstration(Guest starring Andrej Slivko)
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Kata: Minesweeper
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What did you see?
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What did you see?• How often did we switch ”driver”?
• Effects of pairing?• What did the ”non-driver” do?
•How do you expect it to be different?
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What do you think?•Pairing two seniors?•Pairing two juniors?
• Pairing senior and talent?• Pairing senior and junior?
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What did you see?• How many tests?
•Was the step size right?• What was the first test?
• How did we decide next test?• What was the final test?
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What did you see?•Did we refactor the right amount?
• How long was the code red?• Strengths in final design
•Weaknesses in final design•Enough comments?
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Questions?
Your experience?
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Becoming a better programmer
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Why become better programmer?
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Seriously. Why?
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Only 13.37% of effort
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Getting better quality
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Getting better qualityCorrectness
Maintainability
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But more importantly!
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Think better
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Think betterThink beyond the curly brackets
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«The Alignment Trap»
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How to get better
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Practice
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Deliberate Practice• Slow down
• Repeat• Reflect
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Practice at work
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Practice at home
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Practice at home
Watch this space!
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Practice with friends
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Vilnius Coding Dojo?
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What have you learned• TDD makes you productive
• TDD consists of small steps• TDD requires practice
• Pair programming is fun• Pair programming helps you keep flow
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Conclusion
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ConclusionFree your mind
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Free your mindPractice our art
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http://johannesbrodwall.com
http://exilesoft.com
http://twitter.com/jhannes
Thank you