rafer

def model_exists?(model_name)
  begin
    potential_model = model_name.constantize
  rescue NameError
    return false
  end
  ActiveRecord::Base.send(:subclasses).include?(potential_model)
end

rafer

# Should the contestant switch to the other door?
@switch = true
 
@wins = 0; @losses = 0
100000.times do
  # Hide the car
  car_behind = rand(3)
 
  # Contestant picks a door
  contestant_pick = rand(3)