module Comparable
  # 15.3.3.2.1
  def < other
    cmp = self <=> other
    if cmp.nil?
      false
    elsif cmp < 0
      true
    else
      false
    end
  end

  # 15.3.3.2.2
  def <= other
    cmp = self <=> other
    if cmp.nil?
      false
    elsif cmp <= 0
      true
    else
      false
    end
  end

  # 15.3.3.2.3
  def == other
    cmp = self <=> other
    if cmp == 0
      true
    else
      false
    end
  end

  # 15.3.3.2.4
  def > other
    cmp = self <=> other
    if cmp.nil?
      false
    elsif cmp > 0
      true
    else
      false
    end
  end

  # 15.3.3.2.5
  def >= other
     cmp = self <=> other
    if cmp.nil?
      false
    elsif cmp >= 0
      true
    else
      false
    end
  end

  # 15.3.3.2.6
  def between?(min,max)
    if self < min or self > max
      false
    else
      true
    end
  end
end