A code kata is an exercise in programming which helps hone your skills through practice and repetition. Why, when and how do code katas.

1. Code Kata
Giordano Scalzo

2. Who is a programmer?

3. A step towards management...

4. ...or point of no return!

5. NO!

6. Classical Ages of Computer Programming

7. Dark Ages of Computer Programming

8. Renaissance of Computer Programming

9. A real profession

10. The Way of the carpenter is to become
proficient in the use of his tools,
first to lay his plans with a true measure and
then perform his work according to plan.
-Go Rin No Sho

11. SW Craftsman Tools: Languages

12. SW Craftsman Tools: Tdd
Test-driven development (TDD) is a
software development technique that relies
on the repetition of a very short development
cycle
http://en.wikipedia.org/wiki/Test-driven_development

13. Tdd
first the developer writes a failing automated
test case that defines a desired improvement
or new function
http://en.wikipedia.org/wiki/Test-driven_development

14. Tdd
then produces code to pass that test
http://en.wikipedia.org/wiki/Test-driven_development

15. Tdd
and finally refactors the new code to
acceptable standard
http://en.wikipedia.org/wiki/Test-driven_development

16. Tdd cycle

17. Tdd cycle

18. Tdd cycle

19. Tdd cycle

20. Tdd cycle

21. Tdd cycle

22. Tdd cycle

23. Tdd cycle

24. Tdd cycle

25. Tdd cycle

26. Tdd cycle
Got it!

27. Tdd cycle
Easy, isn’t it?

28. Tdd cycle
No, at all! :-(

29. SW Craftsman Tools: Split stories
Business problem

30. SW Craftsman Tools: Split stories
Presentation
Business logic
Persistence

31. SW Craftsman Tools: Split stories
Ft1 Ft2 Ftn
Presentation
Business logic
Persistence

32. SW Craftsman Tools: Editors

33. When improve
them?

34. Work != Practice

35. Code kata

36. Code kata
Kata ( or literally: "form") is a Japanese
word describing detailed choreographed
patterns of movements practised either solo
or in pairs.

37. Code kata
Practice on small exercise

38. Code kata
30 minutes to an hour long

39. Code kata styles
‘Prag’ Dave Thomas
Simple Problems
Many correct solutions
Different each time
Learn by experimentation

40. Code kata styles
‘Uncle’ Bob Martin
Copy a Master
Follow forms precisely
Learn by Repetition
Aim for perfect performance

41. Performance!

42. Kata 9: Back to Checkout
http://codekata.pragprog.com/2007/01/kata_nine_back_.html
Item Unit Special
Price Price
--------------------------
A 50 3 for 130
B 30 2 for 45
C 20
D 15

43. total with no special offers
it "is zero when nothing is scanned"
it "is 50 when A is scanned"
it "is 80 when AB is scanned"
it "is 115 when CDBA is scanned"

44. total when A is on special offer
it "is 130 when AAA is scanned"
it "is 180 when AAAA is scanned"
it "is 260 when AAAAAA is scanned"

45. total when A and B are both in
special offer
it "is 175 when AAABB is scanned"

46. Resources

47. http://codekata.pragprog.com

48. http://codingkata.org

49. http://www.katacasts.org

50. http://www.coderloop.com

51. http://www.vimgolf.com

52. Randori

53. Code Retreat

54. It’s your turn!

55. giordano.scalzo@cleancode.it
@giordanoscalzo
www.slideshare.net/giordano
github.com/gscalzo