This document outlines an agenda for a coding dojo event hosted by Peter Kofler on converting numbers to and from Roman numerals. The event will use pair programming and test-driven development. Attendees will practice converting numbers to Roman numerals under constraints like not using loops or maps. They will also convert Roman numerals to numbers while pair programming in a "ping-pong" style.

1. Coding Dojo:
Roman Numerals
July 2014
Peter Kofler, ‘Code Cop’
@codecopkofler
www.code-cop.org
Copyright Peter Kofler, licensed under CC-BY.

2. PETER KOFLER, CODE-COP.ORG FANATIC ABOUT CODE QUALITY
Peter Kofler
• Ph.D. (Appl. Math.)
• Professional Software
Developer for 15 years
• “fanatic about code quality”
• I help development teams

3. Coding Dojo?
Expectations?

4. PETER KOFLER, CODE-COP.ORG FANATIC ABOUT CODE QUALITY
Coding Dojo Mindset
● Safe place outside
work
● We are here to learn
● Need to slow down
● Focus on doing it right
● Collaborative Game

5. PETER KOFLER, CODE-COP.ORG FANATIC ABOUT CODE QUALITY
Rules
● Collaborative = Pair Programming
● “Randori“ (pairing on the projector)
● or programming in pairs
● Test Driven Development
● think about test cases
● write the test first

6. PETER KOFLER, CODE-COP.ORG FANATIC ABOUT CODE QUALITY
Constraints
● Challenges during a dojo or coderetreat.
● Moving to the extreme is a way of learning
● Examples
● Missing Tool (No Mouse, …)
● Missing Feature (No IFs, …)

7. PETER KOFLER, CODE-COP.ORG FANATIC ABOUT CODE QUALITY
Dojo Structure
● Introduction 15'
● Coding 45'
● Interim (Retrospective) 15'
● Break 10'
● Coding 45'
● Retrospective 15'

8. PETER KOFLER, CODE-COP.ORG FANATIC ABOUT CODE QUALITY
Assignment

9. PETER KOFLER, CODE-COP.ORG FANATIC ABOUT CODE QUALITY
Roman Numerals
● http://en.wikipedia.org/wiki/Roman_numerals
“standard”, subtractive form, 1 – 3999
● convert normal (Arabic) numbers to Roman
numerals:
– 1 → I
– 4 → IV
– 7 → VII
– 10 → X

10. PETER KOFLER, CODE-COP.ORG FANATIC ABOUT CODE QUALITY
Prepare
● Find a pair.
● Choose a programming language.
● Set up the environment.
● Create new project.
● Add testing framework.
● Check Wikipedia for requirements.
● Implement requirements.

11. Don't Focus on
Getting it Done.
F0cus on Doing
It Perfectly.

12. → Practice

13. PETER KOFLER, CODE-COP.ORG FANATIC ABOUT CODE QUALITY
Roman Numerals II
● http://en.wikipedia.org/wiki/Roman_numerals
“standard”, subtractive form, 1 – 3999
● convert Roman numerals to normal (Arabic)
numbers:
– I → 1
– IV → 4
– VII → 7
– X → 10

14. PETER KOFLER, CODE-COP.ORG FANATIC ABOUT CODE QUALITY
Constraint: Ping-Pong
● A writes a test and sees that it fails.
● B writes the code needed to pass the test.
● B refactors the code as needed.
● B writes next test and sees that it fails.
● A writes the code needed to pass the test.
● And so on.

15. PETER KOFLER, CODE-COP.ORG FANATIC ABOUT CODE QUALITY
Algorithm Considerations
● No loops.
● No table/map/switch for literal lookup.
● Subtractive form is not a literal.

16. → Practice

17. PETER KOFLER, CODE-COP.ORG FANATIC ABOUT CODE QUALITY
Short Closing Circle
● How did it work out?
● How do you feel?
● What did you
learn and want
to share with
the group?

18. PETER KOFLER, CODE-COP.ORG FANATIC ABOUT CODE QUALITY
Full Closing Circle
● What did you learn today?
● What surprised you today?
● What will you do
differently in the
future?

19. PETER KOFLER, CODE-COP.ORG FANATIC ABOUT CODE QUALITY
Coding Dojo Vienna
● Biweekly Coding Dojo in Vienna
● Every other Wednesday 6PM
● Changing locations
● Follow
#CodingDojoVie
http://codingdojovie.github.io/

20. PETER KOFLER, CODE-COP.ORG FANATIC ABOUT CODE QUALITY
Global Day of Code Retreat
● A world-wide event celebrating passion
and software craftsmanship.
● GDCR 2014:
15th November
● Follow #GDCR14
http://globalday.coderetreat.org/

21. PETER KOFLER, CODE-COP.ORG FANATIC ABOUT CODE QUALITY
Peter Kofler
@codecopkofler
www.code-cop.org

22. PETER KOFLER, CODE-COP.ORG FANATIC ABOUT CODE QUALITY
CC Images
● Corner
https://www.flickr.com/photos/midatlanticbulldogrescue/160531996
● Dojo http://www.flickr.com/photos/49715404@N00/3267627038/
● Todos http://www.flickr.com/photos/kylesteeddesign/3724074594/
● Date https://www.flickr.com/photos/patmilphotos/7694314328
● Wants you http://www.flickr.com/photos/shutter/105497713/