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Agile Mëtteg - 29 November 2012 Welcome to the dojo! If you want to code like a ninja you have to practice your katas! A code kata is a simple exercise that allows a developer to improve his coding, testing & refactoring skills. In this session you will practice pair-programming, TDD & clean code. This session is for developers only!
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Agile Mëtteg – 29 Nov 2012Coding Dojo
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BOW (REI)
Who are we?Eric Ferrot ([email protected])Cédric Pontet ([email protected] , @cpontet)
Who are you?NameCompanyExperienceLanguage
29 Nov 2012 Agile Mëtteg – Coding Dojo
http://www.breakaway.cc/Asia/Japan/Japan-Bowing.php
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KATA
Kata is a Japanese word describing detailed choreographed patterns of movements practiced either solo or in pairs.By practicing in a repetitive manner the learner develops the ability to execute those techniques and movements in a natural, reflex-like manner. The goal is to internalize the movements and techniques of a kata so they can be executed and adapted under different circumstances, without thought.
29 Nov 2012 Agile Mëtteg – Coding Dojo
型
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DOJO
A dojo is a Japanese term which literally means "place of the way". The term can refer to a formal training place for any of the Japanese do arts but typically it is considered the formal gathering place for students of any Japanese martial arts style such as karate, judo, or samurai, to conduct training, examinations and other related encounters.
29 Nov 2012 Agile Mëtteg – Coding Dojo
道場
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CODING DOJO / CODE KATA
WikipediaKata (programming)
Dave Thomas (Agile Manifesto)
CodeKata
Laurent Bossavit & Emmanuel GaillotCodingDojo
Emilie BacheOnline resources for Coding DojosCoding Dojo Handbook
29 Nov 2012 Agile Mëtteg – Coding Dojo
Agile Mëtteg – Coding Dojo 6
GOAL
Practice of Test Driven DesignBaby stepsRefactoring
Acquire good developer habits
29 Nov 2012
Test
CodeRefactor
Agile Mëtteg – Coding Dojo 7
FIZZBUZZ
Return “fizz”, “buzz” or “fizzbuzz”.For a given natural number greater than zero return
“fizz” if the number is dividable by 3“buzz” if the number is dividable by 5“fizzbuzz” if the number is dividable by 3 and 5
29 Nov 2012
Input Result
1 1
2 2
3 fizz
4 4
5 buzz
6 fizz
10 buzz
15 fizzbuzz
30 fizzbuzz
Agile Mëtteg – Coding Dojo 8
TRANSFORMATION PRIORITY PREMISE
29 Nov 2012
http://cleancoder.posterous.com/the-transformation-priority-premise
Transformation Description
{}–>nil no code at all->code that employs nil
nil->constant
constant->constant+
a simple constant to a more complex constant
constant->scalar replacing a constant with a variable or an argument
statement->statements
adding more unconditional statements
unconditional->if splitting the execution path
scalar->array
array->container
statement->recursion
if->while
expression->function
replacing an expression with a function or algorithm
variable->assignment
replacing the value of a variable
Agile Mëtteg – Coding Dojo 9
PRIME FACTORS
Compute the prime factors of a given natural number
29 Nov 2012
Input Result ([…] denotes a list)
1 []
2 [2]
3 [3]
4 [2,2]
5 [5]
6 [2,3]
7 [7]
8 [2,2,2]
9 [3,3]
Agile Mëtteg – Coding Dojo 10
REFACTORING KATA
Emilie BacheCan you refactor ?In really small steps ?Can you turn some, frankly, ugly code into a paradigm of elegant, readable, extensible design?
29 Nov 2012
Yahtzee
http://www.parentdish.com/2010/04/20/yahtzee-game/
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SAYONARA
What do you think ?Feedback is welcome
Where to find Katas ?Catalogs• CodersDojo• CodeKata• CodingDojo• Schuchert
Samples• CodersDojo• Refactoring Katas
29 Nov 2012 Agile Mëtteg – Coding Dojo
http://www.hoshuha.com/blog/japanese-bowing-etiquette.html
Agile Mëtteg – Coding Dojo 12
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29 Nov 2012
