Slides from Maria Diaconu and Alexandru Balboaca talking at Agileee conference 2009, Ukraine

1. Developers’ Toolkit in
the Agile World
by
Maria Diaconu & Alexandru Bolboaca

2. Code quality & indicators

3. Bad code?
We don’t write bad
code...

4. ...just occasionally

5. ...when under pressure

6. Ups, we are almost
always under pressure

7. Or

8. My code is good-
enough. Why should I
change it?

9. About the story tellers
Maria Diaconu
Developer, Technical Lead, Manager
Agile/Scrum Practitioner & Coach
Owner Mosaic Works
Founder and Coordinator of Romanian Agile
community, AgileWorks Romania

10. About the story tellers
Alexandru Bolboaca
Soft ware Developer
Hands-on soft ware consultant@MosaicWorks
Aspiring soft ware craftsman
Active member of Romanian Agile community,
AgileWorks Romania

11. The fantastic journey
of the beginner
craftsman

12. Programming is fun
when you create great
soft ware & write
beautiful code

13. A minimal toolkit on
the road
Refactoring
TDD Clean Code Emergent Design
Pair
Programming

14. Clean code? What’s
that?

16. Clean variable names
Meaningful names
Intention revealing-names
No encodings (e.g. Hungarian notation)
int d; //elapsed time in days
vs
int elapsedTimeInDays

17. Clean functions
Small !
Do one thing. And it’s DONE well.
Descriptive names
No sides effects
No duplicated functions
ComputeAndWriteResult()
vs
Write(Compute())

18. Clean code - error handling
Try-Catch-Finally - written first
Expected behavior covered first, exceptions
treated after
Don’t return Null; Don’t Pass Null
try {
MealExpenses expenses = expenseReportDAO.getMeals(employee.getID());
m_total += expenses.getTotal();
} catch(MealExpensesNotFound e) {
m_total += getMealPerDiem();
}
vs
MealExpenses expenses = expenseReportDAO.getMeals(employee.getID());
m_total += expenses.getTotal();

19. Refactoring
23 + 23 + 23 + 23 + ... + 23
or
1000 * 23 ?
Improve maintainability
& readability
through changes in small steps
keeping the external behavior

20. Refactoring
To write clean code, you must
first write dirty code and then clean it.
by Robert C. Martin

21. Refactoring - how to
E.g. : Extract methods, class
Move methods
Replace conditions with polymorphism
Eliminate duplicate code
Extract data structure

22. The boy scout rule
It’s not enough to write the code well. The
code has to be kept clean over time.
by Robert C. Martin

23. Use the toolkit for
building soft ware
incrementally

24. How we learn useful
practices?

25. Soft ware Craftsmanship

26. Learn & Practice!
&
Practice & Learn!

27. Code Kata
Code retreat
Coding Dojo

28. Aspiring craftsmen
@AgileWorks -CodeRetreat/Dojo Bucharest - June

29. Good code reads like a
novel.

30. Good code reads like a
novel.
Excellent code reads
like haiku.

31. ... and this is not the
end of the journey

32. Thank you!
Maria Diaconu & Alexandru Bolboaca
MosaicWorks - www.mozaicworks.com
mddiaconu@gmail.com; t witter: fireladyM
www.alexbolboaca.ro
alexboly@gmail.com; t witter: alexboly
AgileWorks Romania - agileworks.ro