Labouchère system simulation in Ruby

gistfile1.rb

# A Ruby version of the Labouchère system simulation in 
# CoffeeScript by Anders Löfgren that can be found at 
# https://github.com/gnidde/gniddegit/blob/master/roulette.coffee
# 2012-03-19 [email protected]

TABLE_ZEROS = 1
MAX_BET = 24
RED_NUMBERS = [1,3,5,7,9,12,14,16,18,19,21,23,25,27,30,32,34,36]

class Player   
  attr_accessor :stake_name, :current_betmin, :current_betmax, :current_earnings

  def initialize(stake_name)
    @stake_name = stake_name
    @current_betmin = 1
    @current_betmax = 4
    @current_earnings = 0
  end

  def calculate_earnings(result)
    # Set correct bet
    current_bet = @current_betmin + @current_betmax

    # Subtract the bet from earnings
    @current_earnings -= current_bet

    # Check if we won
    if result.include? @stake_name
      @current_earnings += 2*current_bet
      @current_betmax += 1
    else
      @current_betmin += 1
      @current_betmax -= 1
    end

    # Check if we need to start over from the beginning the next round
    if @current_betmin >= @current_betmax || @current_betmin + @current_betmax > MAX_BET
      @current_betmin = 1
      @current_betmax = 4
    end
  end
end

def roll(players)
  result = []

  # Let's roll the marble!
  hit = Random.new.rand(1..36+TABLE_ZEROS) - TABLE_ZEROS

  if hit > 0
    result.push RED_NUMBERS.include?(hit) ? :red : :black
    result.push hit < 19 ? :low : :high
    result.push hit % 2 == 0 ? :even : :odd
  else
    @nr_of_zeros_hit += 1
  end

  players.each {|player| player.calculate_earnings result}
end

players = [Player.new(:red), Player.new(:black),
           Player.new(:low), Player.new(:high),
           Player.new(:even), Player.new(:odd)]
@nr_of_zeros_hit = 0

# Let's roll some marbles
(1..1000000).each do |i|
  roll players
  if i%100000 == 0
    total_earnings = players.map(&:current_earnings).reduce(:+)
    puts "#{i} : Total earnings: #{total_earnings}. Nr of zeros hit: #{@nr_of_zeros_hit}"
  end
end