A Little Ruby Exercises, Chapter 2a - https://dl.dropboxusercontent.com/u/40954128/a-little-ruby-a-lot-of-objects/Chapter2.pdf

chapter-2a.rb

# Takes an interger and outputs as a string representation

def ascending?(first, second, third)
  first < second && second < third
end

def descending?(first, second, third)
  first > second && second > third
end

def never_descending?(first, second, third)
  first <= second && second <= third
end

# We include the Comparable protocol which implements comparison operators for a
# class as long as <=> is defined in it.
class FunnyNumber

  include Comparable

  def initialize(int_rep)
    @rep = "n" * int_rep
  end

  def inspect
    "FunnyNumber (#{@rep.length}) #{@rep}"
  end

  def as_integer
    @rep.length
  end

  def <=>(other)
    self.as_integer <=> other.as_integer
  end

end

new_one = FunnyNumber.new(13)

new_two = FunnyNumber.new(33)

new_three = FunnyNumber.new(53)

new_four = FunnyNumber.new(1)

p new_one < new_two

p ascending?(new_one, new_two, new_three)

p descending?(new_three, new_two, new_one)

p never_descending?(new_one, new_two, new_four)