Examples of smaller classes

fayes3.rb

class ClassicRentalPrice
  attr_reader :days_rented

  def initialize(days_rented)
    @days_rented = days_rented
  end

  def amount
    2 * days_rented
  end
end

class NewRentalPrice
  attr_reader :days_rented

  def initialize(days_rented)
    @days_rented = days_rented
  end

  def amount
    3 * days_rented
  end
end

class DocumentaryRentalPrice
  attr_reader :days_rented

  def initialize(days_rented)
    @days_rented = days_rented
  end

  def amount
    if on_special?
      0
    else
      1 * days_rented
    end
  end

  def on_special?
    Time.now.wday == 2
  end
end