From: Brian Candler <b.candler@...>
Date: 2009-10-19T17:45:28+09:00
Subject: Re: Need help comparing Array data

# How about a separate object to represent each choice:
#   RPS::Rock
#   RPS::Paper
#   RPS::Scissors
# and RPS::All is an array of all three.

class RPS
  attr_accessor :beats
  def initialize(name, beats=nil)
    @name = name
    @beats = beats
  end
  def beats?(other)
    @beats == other
  end
  def to_s
    @name
  end

  Rock = new("rock")
  Paper = new("paper", Rock)
  Scissors = new("scissors", Paper)
  Rock.beats = Scissors
  All = [Rock, Paper, Scissors]

  def self.play
    player1 = All[rand All.size]
    player2 = All[rand All.size]

    puts "Player 1 chose #{player1}"
    puts "Player 2 chose #{player2}"
    if player1.beats?(player2)
      puts "Player 1 wins!"
    elsif player2.beats?(player1)
      puts "Player 2 wins!"
    else
      puts "Tie!"
    end
    puts
  end
end

20.times do
  RPS.play
end
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