extreme programming live weactuallybuildstuff johannes brodwall exilesoft chief scientist @jhannes...
TRANSCRIPT
Extreme Programming Live
WeActuallyBuildStuffJohannes Brodwall
Exilesoft Chief scientist
@jhannes
Guest starring: Chaminda Sooriyapperuma
How do you become a
better programmer
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
1. Waddayamean«extreme programming»
2. What to look for3. Demonstration 4. Discussion5. Conclusion
«Extreme programming»?
It is better to• Do the thing right, then to
• Do the right thing• (first)
Ping pong
Ingredient #1:Pair programming
Ingredient #2:Test driven
development
Failing test
Write code
Failing test
Write code
Failing test
Ingredient #3:
Refactoring
Failing test
Write code
Failing test
Write code
Failing test
Refactor code and tests
Refactor code and tests
Put together
Failing test
Write code
Failing test
Write code
Failing test
Failing test
Write code
Failing test
Write code
Failing test
Refactor code and tests
Refactor code and tests
Failing test
Write code
Failing test
Write code
Failing test
Refactor code and tests
Refactor code and tests
Demonstration
What to watch for?
What to watch for?• How do we work together?
• How do we use tests to understand?• How do we «grow» the code?
Please:• Talk about what you see to the person
next to you (whisper)•Tweet to @jhannes
Demonstration(Guest starring Chaminda
Sooriyapperuma)
Kata: Prime factors
Kata: Prime factors1 => []
2 => [2]
3 => [3]
4 => [2,2]
…
2*2*13*17*23*23 => [2,2,13,17,23,23]
What did you see?
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?
What do you think?•Pairing two seniors?•Pairing two juniors?
• Pairing senior and talent?• Pairing senior and junior?
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?
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?
Questions?
Your experience?
Becoming a better programmer
Why become better programmer?
Getting better quality
Getting better qualityCorrectness
Maintainability
Productivity
But more importantly!
Think better
Think betterThink beyond the curly brackets
How to get better
Practice
Deliberate Practice• Slow down
• Repeat• Reflect
Practice at school
Practice at school• Tests lets you solve it faster
Practice at home
Practice at home
Learn more here
Practice with friends
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
+
TDD & different different Levels of
quality
Conclusion
ConclusionFree your mind
Free your mindPractice our art
http://johannesbrodwall.com
http://exilesoft.com
http://twitter.com/jhannes
Thank you