Coding Dojo

Agile Riga Day 2012Johannes Brodwall, Principal Architect

Steria Norway

@jhannes

Motivation

Master programming

through practice

What is TDD for you?

How do you want to apply this on Monday?

What do you want to get out of the day?

Agenda

• 10:05: Demo of TDD and pair programming• 10:20: Coding dojo 1: Prime numbers• 11:20: Retrospective• 11:30: Coding dojo 2: (Romans if you’re slow, Yahtzee

if you’re quick, minesweeper if you’re smart)• 12:30: Lunch• 13:15: Retrospective• 13:45: Break (???!)!• 14:00: Extreme startup• 15:30: Retrospective

TDD

TDDNo code without test

Just enough test to red

Just enough code to green

(+ refactor!)

Pair programming

Ping/pong

Driver/Navigator

What benefits can you get from pair programming?

Kata 0: Leap Year

Kata 1: Prime factors

Kata: Prime factors1 => []

2 => [2]

3 => [3]

4 => [2,2]

…

2*2*13*17*23*23 => [2,2,13,17,23,23]

Did you change drivers at good frequency?

How did the solution end up looking?

How did you determine next test?

What tests did you start with?

Which tests didn’t help you?

How did your choice of language help/hurt?

What surprised you?

What do you want to achieve next round?

What did you learn?

Kata 2a: Minesweeper

Given:var minefield = new Minefield([ "....", ".*..", ".*.*", "...*“ ])

Did you change drivers at good frequency?

How did the boundary conditions affect your test and code?

How did you determine next test?

What tests did you start with?

Which tests didn’t help you?

How did your choice of language help/hurt?

What surprised you?

What do you want to achieve next round?

What did you learn?

Kata 2b: Yahtzee

Kata: Yahtzee({1,1,1,1,1}, «ones»} => 5

({1,1,1,1,1}, «sixes»} => 0

({1,1,1,1,1}, «yahtzee»} => 50

Ones, twos, threes, fours, fives, sixes

Pair, two pairs, three of a kind, four of a kind, full house

Yahtzee

Little straight, big straight

Chance

Did you change drivers at good frequency?

What is ({2,2,3,6,6}, «pair»)?

How did you determine next test?

What tests did you start with?

Which tests didn’t help you?

How did your choice of language help/hurt?

What surprised you?

What do you want to achieve next round?

What did you learn?

Kata 2c: Romans

Kata: Romans1 => I

5 => V

1999 => MCMXCIX

Did you change drivers at good frequency?

How did you implement rules for «IV» etc?

How did you determine next test?

What tests did you start with?

Which tests didn’t help you?

How did your choice of language help/hurt?

What surprised you?

What do you want to achieve next round?

What did you learn?

Extreme startup

The Extreme startup code competition

By Matt Wynne and Robert Chatly

OrientationDownload starting point

(http://github.com/steria/extreme_startup_servers)

Start server

Register(http://192.168.11.182:3000/)

Solve questions

RulesCheat like mad!

Only results matter

No destruction of property

Obey local laws

Don’t f$%! with workshop computer

GuidelinesWork as you like

(Tip: Use a language you know)

Help those behind

Upload your code (if possible)

OrientationDownload starting point

(http://github.com/steria/extreme_startup_servers)

Start server

Register(http://192.168.11.182:3000/)

Solve questions

Form teams!

Round 1

Round 1

(fight!)

Round 1: Retrospective

Testing?

Teamwork?

Round 2

Round 2

(fight!)

Round 2: Retrospective

Testing?

Teamwork?

Which questions did you solve?

Annoying questions?

How did you mess up?

How did you cheat?

Retrospective

What surprised you?

What will you do different in the future?

What did you learn?

Riga Coding Dojo?http://johannesbrodwall.com/2011/12/18/how-to-start-a-coding-dojo/

Thank youjohannes.brodwall@steria.no

http://johannesbrodwall.com

http://twitter.com/jhannes