In this kata we'll use TDD to develop an object-oriented solution for the Rock-paper-scissors game.
The catch is that we can't use any conditionals, that is, if, switch, ternary operator or any other type of conditionals are not allowed.
It's an introductory kata which will help you to hone your OO skills.
This would be the initial code in Ruby:
class RockPaperScissors
def hand(gesture1, gesture2)
end
end
A hand can have three differente results: either the first gesture wins, the second gesture wins or there's a tie.
As a bonus we'll compare the resulting OO solution with a solution using multimethods.
Spoilers (don't look before trying to do it yourself)
A solution I wrote some time ago in Ruby and a solution using multimethods in Clojure.
Update
A newer solution in Ruby with commits after every passing test and every refactoring.