Coderetreat @AgileFinland Turku 2014 11 15

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Adi Bolboaca

The slides from the coderetreat on the Global Day of Coderetreat 2014 in Turku, Finland

Technology

www.mozaicworks.com
Me
Adi Bolboaca
Organizational & Technical
Trainer & Coach

Why?
Learn through pairing
Extend your comfort zone
Practice
Experiment
Learn new practices
www.mozaicworks.com

How?
1 day of coding
Choose a simple problem
6 pairing partners
On average 135 minutes of coding
6 different constraints
A lot of fun!
www.mozaicworks.com

How it started
CodeMash conference 2009
Gary Bernhardt
Patrick Welsh
Nayan Hajratwala
Corey Haines
www.mozaicworks.com

How it started
Repeatable
Day-long
Practice the fundamentals of programming
Intense day of coding
www.mozaicworks.com

Day structure
15' introduction
3 sessions of 45' coding + 15' retro&break
1h lunch
3 sessions of 45' coding + 15' retro&break
15' closing circle
www.mozaicworks.com

Principles
Language agnostic
Do not try to finish the problem
Delete the code after each session
Focus on practicing
Experiment each session
Have fun!
www.mozaicworks.com

How to take advantage
1. Embrace the freedom of deleting the code
2. Do what you always wanted but couldn't
3. Get out of your comfort zone
4. Pair with strangers in languages you don't know
5. What you learn is your responsibility

Prerequisites
Computer
Coding environment
Testing framework
Source control (git, svn, etc)
www.mozaicworks.com

The four elements of simple design
1) Passes its tests
2) Minimizes duplication
3) Maximizes clarity
4) Has fewer elements
www.mozaicworks.com

Conway's game of life
Having an infinite 2D orthogonal universe
Being given an initial generation called a seed
The following rules are applied simultaneously
A live cell having less than 2 live neighbors dies
A live cell having 2 or 3 live neighbors lives
A live cell having more than 3 neighbors dies
A dead cell having 3 neighbors becomes alive
www.mozaicworks.com

Session 1: Understand the problem
Find a pair
Choose a programming language
Setup the environment
Choose an entry point for the problem
Start in 5 min
www.mozaicworks.com

Session 2: Evil pairing
Ping-pong pairing
Be evil, write the bad implementation for test
www.mozaicworks.com

Session 3: Immutable
You cannot change the state of an object during
execution
www.mozaicworks.com

Code retreat
1 hour Lunch
www.mozaicworks.com

Session 4: Universe wormholes
Both orthogonal and hexagonal universe
Time passes differently
There is a pentagonal transient area between
them
www.mozaicworks.com

Session 4: Universe wormholes
www.mozaicworks.com

Session 4: Universe wormholes
There are six 1st tier neighbors
There are six 2nd tier neighbors
Live 1st tier neighbors weight 1.0
Live 2nd tier neighbors weight 0.3
Each cell has a weighted sum of all
its 12 neighbors
www.mozaicworks.com

Session 4: Universe wormholes
Having an infinite 2D hexagonal universe
Being given an initial generation called a seed
These rules are applied simultaneously on tick
A live cell having less than 2.0 sum dies
A live cell having 2.0 – 3.3 sum lives on
A live cell having more than sum 3.3 dies
A dead cell having 2.3 - 2.9 sum becomes alive
www.mozaicworks.com

Session 5: Event driven
All the connections are just events
No other way of communication is allowed
www.mozaicworks.com

Session 6: New language
Try a new language
www.mozaicworks.com

Closing circle
1) How did you feel?
2) What did you learn today?
3) What will you do differently tomorrow?
www.mozaicworks.com

Code retreat
Why?
Learn through pairing
Extend your comfort zone
Practice
Experiment
Learn new practices
www.mozaicworks.com

Contact me
● Remote pair-programming
● Unit testing workshop
● Test driven development workshop
● Clean code workshop
● Refactoring workshop
● Legacy code retreat
● Working FAST and Safe with existing
code
● Code retreat
www.mozaicworks.com

Code retreat
Extend your mentoring & training capacity
Accelerate learning through communities
of practice
Grow your functional leaders and top
talents
http://www.mozaicworks.com
adrian.bolboaca@mozaicworks.com
@adibolb

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Coderetreat @AgileFinland Turku 2014 11 15

1. Code retreat www.mozaicworks.com

2. www.mozaicworks.com Me Adi Bolboaca Organizational & Technical Trainer & Coach

3. 2009, First time outside US

4. Why? Learn through pairing Extend your comfort zone Practice Experiment Learn new practices www.mozaicworks.com

5. How? 1 day of coding Choose a simple problem 6 pairing partners On average 135 minutes of coding 6 different constraints A lot of fun! www.mozaicworks.com

6. How it started CodeMash conference 2009 Gary Bernhardt Patrick Welsh Nayan Hajratwala Corey Haines www.mozaicworks.com

7. How it started Repeatable Day-long Practice the fundamentals of programming Intense day of coding www.mozaicworks.com

8. Day structure 15' introduction 3 sessions of 45' coding + 15' retro&break 1h lunch 3 sessions of 45' coding + 15' retro&break 15' closing circle www.mozaicworks.com

9. Principles Language agnostic Do not try to finish the problem Delete the code after each session Focus on practicing Experiment each session Have fun! www.mozaicworks.com

10. How to take advantage 1. Embrace the freedom of deleting the code 2. Do what you always wanted but couldn't 3. Get out of your comfort zone 4. Pair with strangers in languages you don't know 5. What you learn is your responsibility

11. Prerequisites Computer Coding environment Testing framework Source control (git, svn, etc) www.mozaicworks.com

12. The four elements of simple design 1) Passes its tests 2) Minimizes duplication 3) Maximizes clarity 4) Has fewer elements www.mozaicworks.com

13. Conway's game of life Having an infinite 2D orthogonal universe Being given an initial generation called a seed The following rules are applied simultaneously A live cell having less than 2 live neighbors dies A live cell having 2 or 3 live neighbors lives A live cell having more than 3 neighbors dies A dead cell having 3 neighbors becomes alive www.mozaicworks.com

14. Session 1: Understand the problem Find a pair Choose a programming language Setup the environment Choose an entry point for the problem Start in 5 min www.mozaicworks.com

15. Conway's game of life Having an infinite 2D orthogonal universe Being given an initial generation called a seed The following rules are applied simultaneously A live cell having less than 2 live neighbors dies A live cell having 2 or 3 live neighbors lives A live cell having more than 3 neighbors dies A dead cell having 3 neighbors becomes alive www.mozaicworks.com

16. Session 2: Evil pairing Ping-pong pairing Be evil, write the bad implementation for test www.mozaicworks.com

17. Session 3: Immutable You cannot change the state of an object during execution www.mozaicworks.com

18. Code retreat 1 hour Lunch www.mozaicworks.com

19. Session 4: Universe wormholes Both orthogonal and hexagonal universe Time passes differently There is a pentagonal transient area between them www.mozaicworks.com

20. Session 4: Universe wormholes www.mozaicworks.com

21. Session 4: Universe wormholes There are six 1st tier neighbors There are six 2nd tier neighbors Live 1st tier neighbors weight 1.0 Live 2nd tier neighbors weight 0.3 Each cell has a weighted sum of all its 12 neighbors www.mozaicworks.com

22. Session 4: Universe wormholes Having an infinite 2D hexagonal universe Being given an initial generation called a seed These rules are applied simultaneously on tick A live cell having less than 2.0 sum dies A live cell having 2.0 – 3.3 sum lives on A live cell having more than sum 3.3 dies A dead cell having 2.3 - 2.9 sum becomes alive www.mozaicworks.com

23. Session 5: Event driven All the connections are just events No other way of communication is allowed www.mozaicworks.com

24. Session 6: New language Try a new language www.mozaicworks.com

25. Closing circle 1) How did you feel? 2) What did you learn today? 3) What will you do differently tomorrow? www.mozaicworks.com

26. Code retreat Why? Learn through pairing Extend your comfort zone Practice Experiment Learn new practices www.mozaicworks.com

27. Contact me ● Remote pair-programming ● Unit testing workshop ● Test driven development workshop ● Clean code workshop ● Refactoring workshop ● Legacy code retreat ● Working FAST and Safe with existing code ● Code retreat www.mozaicworks.com

28. Code retreat Extend your mentoring & training capacity Accelerate learning through communities of practice Grow your functional leaders and top talents http://www.mozaicworks.com adrian.bolboaca@mozaicworks.com @adibolb

Coderetreat @AgileFinland Turku 2014 11 15

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