gistfile1.rb

# Started with something like this
class GoKart
  def initialize( strategy = nil )
    @strategy = strategy
  end

  def drive
    if @strategy == :reverse
      puts "Reverse"
    else
      puts "Forward"
    end
  end

  def stop
    puts "Stop"
  end

end

# And have external consumer doing this:

k = GoKart.new()
k.drive
k.stop

k = GoKart.new( :reverse )
k.drive
k.stop