Class: MontyHallProblem::Playground

Inherits:
Object
  • Object
show all
Defined in:
lib/monty_hall_problem.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(times, door_size: 3, car_size: 1, open_size: 1) ⇒ Playground

Returns a new instance of Playground.



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# File 'lib/monty_hall_problem.rb', line 78

def initialize(times, door_size: 3, car_size: 1, open_size: 1)
  self.times = times
  @door_size = door_size
  @car_size = car_size
  @open_size = open_size
end

Instance Attribute Details

#times ⇒ Object

Returns the value of attribute times.



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# File 'lib/monty_hall_problem.rb', line 76

def times
  @times
end

Instance Method Details

#play(mode) ⇒ Object 



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# File 'lib/monty_hall_problem.rb', line 108

def play(mode)
  result = self.times.times.map do
    mode == :change ? play_change : play_no_change
  end

  win_count = result.count { |e| e == :win }
  lose_count = result.count { |e| e == :lose }
  puts "#{mode} - all:#{self.times}; win:#{win_count}; lose:#{lose_count}; P(win)=#{(win_count.to_f/self.times.to_f * 100).round(2)}%"
  self
end

#play_change ⇒ Object 



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# File 'lib/monty_hall_problem.rb', line 85

def play_change
  doors = Doors.new(@door_size)
  host = Host.new(doors, @car_size)
  player = Player.new(doors)

  host.put_cars
  idx = player.choose_door
  host.open_wronth_door(idx, @open_size)
  idx = player.change_door(idx)
  host.make_known(idx) ? :win : :lose
end

#play_no_change ⇒ Object 



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# File 'lib/monty_hall_problem.rb', line 97

def play_no_change
  doors = Doors.new(@door_size)
  host = Host.new(doors, @car_size)
  player = Player.new(doors)

  host.put_cars
  idx = player.choose_door
  host.open_wronth_door(idx, @open_size)
  host.make_known(idx) ? :win : :lose
end