Agileee Developers Toolkit In The Agile World

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

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Agileee Developers Toolkit In The Agile World

  1. 1. Developers’ Toolkit in the Agile World by Maria Diaconu & Alexandru Bolboaca
  2. 2. Code quality & indicators
  3. 3. Bad code? We don’t write bad code...
  4. 4. ...just occasionally
  5. 5. ...when under pressure
  6. 6. Ups, we are almost always under pressure
  7. 7. Or
  8. 8. My code is good- enough. Why should I change it?
  9. 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. 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. 11. The fantastic journey of the beginner craftsman
  12. 12. Programming is fun when you create great soft ware & write beautiful code
  13. 13. A minimal toolkit on the road Refactoring TDD Clean Code Emergent Design Pair Programming
  14. 14. Clean code? What’s that?
  15. 15. Clean variable names Meaningful names Intention revealing-names No encodings (e.g. Hungarian notation) int d; //elapsed time in days vs int elapsedTimeInDays
  16. 16. Clean functions Small ! Do one thing. And it’s DONE well. Descriptive names No sides effects No duplicated functions ComputeAndWriteResult() vs Write(Compute())
  17. 17. 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();
  18. 18. Refactoring 23 + 23 + 23 + 23 + ... + 23 or 1000 * 23 ? Improve maintainability & readability through changes in small steps keeping the external behavior
  19. 19. Refactoring To write clean code, you must first write dirty code and then clean it. by Robert C. Martin
  20. 20. Refactoring - how to E.g. : Extract methods, class Move methods Replace conditions with polymorphism Eliminate duplicate code Extract data structure
  21. 21. 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
  22. 22. Use the toolkit for building soft ware incrementally
  23. 23. How we learn useful practices?
  24. 24. Soft ware Craftsmanship
  25. 25. Learn & Practice! & Practice & Learn!
  26. 26. Code Kata Code retreat Coding Dojo
  27. 27. Aspiring craftsmen @AgileWorks -CodeRetreat/Dojo Bucharest - June
  28. 28. Good code reads like a novel.
  29. 29. Good code reads like a novel. Excellent code reads like haiku.
  30. 30. ... and this is not the end of the journey
  31. 31. 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

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