Both Common Lisp and Racket have keyword arguments, and even Clojure kind of has them(it cheats by using map destructuring). Common Lisps in particular are very

Both Common Lisp and Racket have keyword arguments, and even Clojure kind of has them(it cheats by using map destructuring). Common Lisps in particular are very powerful and flexible, see http://www.gigamonkeys.com/book/functions.html http://www.gigamonkeys.com/book/functions.html