1 < x < 10

gistfile1.txt

{ '<' => [-1], '>' => [1], '<=' => [-1, 0], '>= ' => [1, 0]}.each do |ope, v|
  [TrueClass, FalseClass].each do |klass|
    klass.class_eval("def #{ope}(num); self ? value #{ope} num : false;end")
  end
  [Integer, Float].each do |klass|
    klass.class_eval do
      define_method(ope) do |n|
        return false unless v.include? (self <=> n)
        TrueClass.class_eval("def value; #{n};end")
        true
      end
    end
  end
end