def def_fizzBuzz(sel, n)
  Integer.class_eval{
    define_method(sel){
      (m = self) % n == 0 ?
        sel.to_s.capitalize.instance_eval{ @x = m; self} :
        self
    }
  }
  String.class_eval{
    define_method(sel){
      (m = self.instance_eval{ @x }) % n == 0 ?
        (self+sel.to_s.capitalize).instance_eval{ @x = m; self} :
        self
    }
  }
end
 
def_fizzBuzz :fizz, 3
def_fizzBuzz :buzz, 5
def_fizzBuzz :gizz, 7
 
p 1.fizz.buzz #=> 1
p 3.fizz.buzz #=> "Fizz"
p 5.fizz.buzz #=> "Buzz"
p 15.fizz.buzz #=> "FizzBuzz"
p 7.fizz.buzz.gizz #=> "Gizz"
p 21.fizz.buzz.gizz #=> "FizzGizz"
p 35.fizz.buzz.gizz #=> "BuzzGizz"
p 105.fizz.buzz.gizz #=> "FizzBuzzGizz"
p 105.fizz.gizz.buzz #=> "FizzGizzBuzz"
p 999.fizz.buzz #=> "Fizz"
 
p 1.fizz.buzz + 2 #=> 3
p (1.fizz.buzz + 2.buzz).fizz #=> "Fizz"
p 15.fizz.buzz.gizz + "XXX" #=> "FizzBuzzXXX"

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