These are the slides we used during Istanbul/Turkey event of Global Day of Coderetreat on November 15th, 2014.

1. celebrating passion and craftsmanship
November 15, 2014
Global Day of
Coderetreat

2. Organizators
Agile Turkey established in 2008
as a nonprofit organization.
It aims to enhance IT project
success in the Turkish market by
expanding the world wide proven
Agile Methodologies’ usage.
Facilitators
Lemi Orhan Ergin
Umut Işık

3. like to work alone
feel safe to work on confort zone
have to focus on daily work
skip writing tests
cannot find time to experiment
not willing to learn new practices
do not think about design
focus on gettings things done
over-engineer
do not refactor
Developers

4. have to improve their craft
Developers

5. is the best way how we improve our craft
Practicing

6. How to Practice
Challenge
Repeat
Feedback
again and again and again and again

7. How to Practice
No Pressure
do not complete the task
but master it

8. practicing
mastering
Code Retreat is about
and

9. writing
the perfect code
Code Retreat is about

10. learning through pairing
extending your confort zone
no pressure of daily work
experimenting
learning new practices
thinking deeply about design
building structures simple
developing whenever required
refactoring
Code Retreat is about

11. 1 day coding
45 minutes sessions
Pair programming
Test first development
Different partners on each session
Different constraints
Format

12. Schedule
Retrospective
Break
Closing
Ceramony
Coding 45
10
5 5 5 5 5
10 10 10 10
15
45 45 45 45 45
Lunch

13. Code generation is not important
Generate code by thinking the design
Focus on naming test cases
Focus on Red/Green/Refactor cycle
Why Repeating?

14. You are not your code
Learn to go slower
Focus on being better
Do not think about finishing
It’s all about practicing
Why Deleting?

15. Language agnostic
Do not try to complete
Focus on practicing
Write code than open to accept change
Follow 4 rules of simple design
Delete code after each session
Have fun
Principles

16. History
The idea was spawned at
CodeMash Conference’09
The owners of the idea
Gary Bernhardt
Patrick Welsh
Nayan Hajratwala
Corey Haines
First was held on
January 24, 2009
Corey Haines
https://www.flickr.com/photos/charliekilo/7717370426

17. Global Day of
Code Retreat
6 continents
137 cities
20 timezones
2000+ developers
31 hours of coding
coderetreat.org
Coderetreat Community Network
November 15, 2014
https://www.flickr.com/photos/stef3d/4560661663

18. Global Day of
Code Retreat
Thanks to hundreds of
hosts and facilitators
worldwide
coderetreat.org
Coderetreat Community Network
November 15, 2014
https://www.flickr.com/photos/stef3d/4560661663

19. This year's Global Day of Coderetreat supports CoderDojo
Any funds not used to support GDCR will go to CoderDojo
coderdojo.com

20. https://www.youtube.com/watch?v=H04wb0ESD4o

21. CoderDojo is a global volunteer-led community of free
programming clubs for young people between 7 and 17.
CoderDojo gives young people all over the world better
access to the “Magic behind the technology” that surrounds
us and touches almost everything that we do in our lives.
coderdojo.com

22. Today, there are over 500 Dojos spread across 48 countries
from Ireland, to the USA, to Japan, and even Nigeria.
coderdojo.com

23. Within CoderDojo there is a focus on developing creativity, a
sense of community, peer learning skills, mentoring and self
led learning with an emphasis on openness and showing
how coding can be a force for positive change.
coderdojo.com

24. We cannot make it
without their support

25. A software company and community of
passionate individuals whose purpose is to
revolutionise software creation and delivery,
while advocating for positive social change.
www.thoughtworks.com

26. GitHub is the best place to share code with
friends, co-workers, classmates, and complete
strangers. Over seven million people use GitHub
to build amazing things together.
www.github.com

27. www.dnsimple.com
DNSimple is a hosted DNS service that you can
use to manage your domains.

28. www.sony.com.tr
www.acm-software.com

29. Simple Design
Simple design in one that is
easy to change.
We don’t know exactly what is going to need to change
We’ll never be more ignorant than we are at this moment
https://leanpub.com/4rulesofsimpledesign

30. Simple Design
Tests pass
4 Rules of
“Tests pass” can be a significant factor in
making changes. If you have to ask how fast
your test suite should be, it should be faster
1

31. Simple Design
Express Intent
4 Rules of
Paying attention to the names and how your
code expresses itself is the key.
2

32. Simple Design
No Duplication (DRY)
4 Rules of
It’s not about code duplication, it’s about
knowledge duplication. Don’t repeat yourself.
Every piece of knowledge should have one and
only one representation.
3

33. Simple Design
Small
4 Rules of
Has fewer classes, modules, packages. Any not-
used code should be deleted. You should also
check missing or duplicate abstractions. Over-
extraction should also be not allowed.
4

34. http://blog.thecodewhisperer.com/2013/12/07/putting-an-age-old-battle-to-rest
“Putting an Age-Old Battle to Rest” by Joe Rainsberger
The Simple Design Dynamo

35. TDDWrite exactly one new test1
2 Run the test to make sure it fails
3 Write least amount of code to make the test pass
4 Refactor to remove duplication
5 Repeat the process
Test Driven Development
Test Driven Design
Test First Development

36. Zero-player game
Cellular automation system
Devised by John Horton Conway
Evolution is determined by initial state
Each cell can be alive or dead
Conway’s Game of Life
Problem to solve:

37. Each cell has 8 neighbours
and follows 3 rules
1 2 3
4
567
8

38. Any live cell with fewer than 2 live neighbours
dies of loneliness
Rule 1

39. Any live cell with more than 3 live neighbours
dies of overcrowding
Rule 2

40. Any dead cell with exactly 3 live neighbours
comes to life of warmth
Rule 3

41. Avoid to use primitives
Avoid to use conditional conditions (if, ?:, switch)
Avoid to use loops (while, for)
All methods return void
Max 5 lines of code per method
Verbs instead of nouns
Ping pong programming
Mute ping pong programming
Swap computers
Do not use mouse
Variations

42. ENJOYremember
whatever you do
do not forget to
https://www.flickr.com/photos/fraserspeirs/3394902061
Joe O'Brien and Jim Weirich while doing ruby code review

43. sessions
let the
begin
We select 6 activities amoung the activities list after checking
TDD and pair programming experiences of the attendees.
Every coderetreat has its own set of activities.

44. No constraints
Do your best

45. Ping-pong pair programming

46. No primitives
Use only immutable objects

47. No primitives
No conditionals
Max 5 lines of code

48. No way to return any value
Verbs instead of Nouns

49. Mute ping-pong

50. What, if anything, did you learn today?
What, if anything, surprised you today?
What, if anything, will you do differently?
closing

51. The photo on the first slide is taken by Mirza Abdurrahim Çetin.
It is adapted as allowed by the license CC BY-NC 2.0
https://www.flickr.com/photos/abdurrahimcetin/5773149987
https://creativecommons.org/licenses/by-nc/2.0