Rscheme vs. Commom Lisp

Some common lisp facilities are not provided in Rscheme. These include:

1.

Keyword arguments, optional arguments to functions.

2.

Generalized setf facility.

3.

Module facilities.

  The following example illustrates how functions with variable number of argument can be implemented in Rscheme. Consider the function

(define (foo x . arg)
  (if (null? arg) x (+ x (apply + arg)))
)

When calling foo with a variable number of arguments, arg will be instantiated to the list of arguments following the first argument in the the call. For example, in (foo 2 3 2), arg will be the list (3 2), and in (foo 2), arg will be ().