Coding Dojo Sofware People 2012 Johannes Brodwall Principal

Coding Dojo Sofware People 2012 Johannes Brodwall, Principal Architect Steria Norway @jhannes

Guest starring Dmytro Mindra

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

Motivation

Master programming

through practice

What does good programming mean for you? What do you want to get out of the day? How do you want to apply this on Monday?

Agenda

• • • 10: Demo of TDD and pair programming 10: 20: Randori style Leap Years kata with everyone 10: 40: Two groups, randori style Prime Factors 11: 10: Retrospective 11: 30: Two groups, randori style Prime Factors, take 2 12: 00: Coding dojo 2: Romans if you’re slow, Yahtzee if you’re quick, minesweeper if you’re smart 13: 00 – break in the middle 13: 45: Retrospective 14: 00: Lunch 15: 00: Extreme startup 16: 30: Break 17: 15: Wrap-up

TDD

TDD No code without test Just enough test to red Just enough code to green (+ refactor!)

Pair programming

Ping/pong Driver/Navigator

Failing test Write code Failing test

Failing test Write code Refactor code and tests Failing test

What benefits can you get from pair programming?

Kata 0: Leap Year

Kata 1: Prime factors

Kata: Prime factors 1 => [] 2 => [2] 3 => [3] 4 => [2, 2] … 2*2*13*17*23*23 => [2, 2, 13, 17, 23]

How did your choice of language help/hurt? What tests did you start with? Which tests didn’t help you? Did you change drivers at good frequency? How did you determine next test? How did the solution end up looking?

What surprised you? What did you learn? What do you want to achieve next round?

Kata 2 a: Minesweeper

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

What surprised you? What did you learn? What do you want to achieve next round?

How did your choice of language help/hurt? What tests did you start with? Which tests didn’t help you? Did you change drivers at good frequency? How did you determine next test? How did the boundary conditions affect your test and code?

Kata 2 b: Yahtzee

Kata: Yahtzee ({1, 1, 1}, «ones» } => 5 ({1, 1, 1}, «sixes» } => 0 ({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

What surprised you? What did you learn? What do you want to achieve next round?

How did your choice of language help/hurt? What tests did you start with? Which tests didn’t help you? Did you change drivers at good frequency? How did you determine next test? What is ({2, 2, 3, 6, 6}, «pair» )?

Kata 2 c: Romans

Kata: Romans 1 => I 5 => V 1999 => MCMXCIX

What surprised you? What did you learn? What do you want to achieve next round?

How did your choice of language help/hurt? What tests did you start with? Which tests didn’t help you? Did you change drivers at good frequency? How did you determine next test? How did you implement rules for «IV» etc?

Extreme startup

The Extreme startup code competition By Matt Wynne and Robert Chatly

Orientation Download starting point (http: //github. com/steria/extreme_startup_servers) Start server Register (http: //192. 168. 11. 182: 3000/) Solve questions

Rules Cheat like mad! Only results matter No destruction of property Obey local laws Don’t f$%! with workshop computer

Guidelines Work as you like (Tip: Use a language you know) Help those behind Upload your code (if possible)

Orientation Download starting point (http: //github. com/steria/extreme_startup_servers) Start server Register (http: //192. 168. 11. 182: 3000/) Solve questions