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##WITHOUT #SEND
#This solution only works as long as you know exactly what methods are going to be called. What if you didn't? What if you did not know all the actions that were possible on the glider object? If only there was a generic way

class Glider
  def lift
    puts "Rising"
  end
  
  def bank
    puts "Turning"
  end
end

class Nomad
  def initialize(glider)
    @glider = glider
  end

  def do(action)
    if action == 'lift'
      @glider.lift
    elsif action == 'bank'
      @glider.bank
    else
      raise NoMethodError.new(action)
    end
  end
end

nomad = Nomad.new(Glider.new)
nomad.do("lift")
nomad.do("bank")


### WITH #SEND
#Ruby gives a convenient way for you to call any method on an object by using the send method. send takes, as its first argument, the name of the method that you want to call. This name can either be a symbol or a string.

class Nomad
  def initialize(glider)
    @glider = glider
  end

  def do(action)
    @glider.send(action)
  end
end

#Additionally, now some of these actions require further arguments. e.g. The command to 'bank' takes a string of either 'left' or 'right', while the command to 'roll' takes the number of degrees it should dive for. Again, send gives us a convenient way to pass arguments to these methods. All further arguments to send after the first (which you'll recall has the name of the method you want called itself) become arguments that get passed down to that method.

class Nomad
  def initialize(glider)
    @glider = glider
  end

  def do(action, argument = nil)
    if argument == nil
      @glider.send(action)
    else
      @glider.send(action, argument)
    end
  end
end

#### WITHOUT #SEND
class Sorter
  def move_higher
    puts "moved one higher"
  end

  def move_lower
    puts "moved one lower"
  end

  def move(type)
    case type
    when "higher" then move_higher
    when "lower" then move_lower
    end
  end

end


##### WITH #SEND
class Sorter
  def move_higher
    puts "moved one higher"
  end

  def move_lower
    puts "moved one lower"
  end

  def move(type)
    self.send "move_" + type
  end
end