Factorial in LISP


factorial 1->1; n->n*(factorial n-1)

compare to Haskell

factorial::Integer->Integer
factorial 0=1
factorial n=n*factorial(n-1)

>>17
But I need a guestbook to store hate mails about how I butchered LISP and misunderstood concepts of Haskell. I also want to provide access for exectuing code directly from browser, so people I troll wont have to install SBCL beforehand or trust that my code wont mess their system.