factorial in functional approach, with javascript

factorial

//Here's the standard naive factorial:
function fact(n) {
  if (n == 0)
    return 1 ;
  else
    return n * fact(n-1) ;
}

//Here it is in CPS:
function fact(n,ret) {
  if (n == 0)
    ret(1) ;
  else
    fact(n-1, function (t0) {
     ret(n * t0) }) ;
}