fizzbuzz.js

fizz = function f() {
 fizz = function () {
  fizz = function () {
   fizz = f
   return "Fizz"
  }
 }
}

buzz = function f() {
 buzz = function () {
  buzz = function () {
   buzz = function () {
    buzz = function () {
     buzz = f
     return "Buzz"
    }
   }
  }
 }
}

n = 0
fizzbuzz = function () {
  ++n
  console.log((fizz() || "") + (buzz() || "") || n)
}