Countdown ruby class is for making countdown ranges without #reverse

countdown_class.rb

# Countdown class is for making countdown ranges without reversing.
# a = Countdown.new 5
# b = Countdown.new 1
# print (a..b).map(&:value).join(', ') # => 
#   5, 4, 3, 2, 1 => nil
class Countdown
  VERSION = 0
  attr_accessor :value

  def initialize(value)
    @value = value
  end

  def <=>(other)
    # TODO: Test `-1 * (value <=> other.value)`
    if value > other.value
      -1
    elsif value == other.value
      0
    else
      1
    end
  end

  def succ
    self.class.new(value - 1)
  end
  
  alias next succ
end