move_and_extract_function_example_extraction.rb

class SubwayTrain
  attr_accessor :averageSpeed, :subwayCar, :speed, :subwayCars

  def initialize
    self.averageSpeed = 17
    self.speed = 0;  
    self.subwayCars = []; 
  end

  def allowPassengersOnBoard
    puts "Train arriving at station."
    slowDownToHalt
    puts "Train Stopped."
    openDoors 
    puts "Doors Open."
    sleep 1
    puts "Stand Clear of the Closing Doors"
    increaseSpeedToAverageSpeed
    puts "Train leaving station."
  end 

  def slowDownToHalt
   while(speed > 0)
      self.speed -= 1
    end
  end 

  def openDoors
    subwayCars.each do | subwayCar | 
      subwayCar.close()
    end  
  end 

  def increaseSpeedToAverageSpeed
    while(speed < averageSpeed)
      self.speed += 1
    end 
  end 
end 

train = SubwayTrain.new 
train.speed = 100; 
train.allowPassengersOnBoard