Ruby tweak for reverse sorting

reverse_sort.rb

module Comparable
  class Inverse
    def initialize(value)
      @value = value
    end

    attr_reader :value

    def <=>(other)
      other.is_a?(self.class) or raise TypeError, "Inverse can only be compared with Inverse"

      other.value <=> value
    end
  end

  def to_sort_desc
    Inverse.new(self)
  end

  def to_sort_asc
    self
  end
end

pp [
  ["B", "a"],
  ["B", "b"],
  ["A", "a"],
  ["A", "c"],
  ["A", "b"],
].sort_by { |x, y| [x, y.to_sort_desc] }
#=> [["A", "c"], ["A", "b"], ["A", "a"], ["B", "b"], ["B", "a"]]