Question

I am familiar with Common Lisp and trying to learn some Scheme, so I have been trying to understand how I’d use Scheme for things I usually code in Common Lisp.

In Common Lisp there’s fboundp, which tells me if a symbol (the value of a variable) is bound to a function. So, I would do this:

(let ((s (read)))
  (if (fboundp s)
      (apply (symbol-function s) args)
      (error ...)))

Is that possible in Scheme? I’ve been trying to find this in the R6RS spec but coudn’t find anything similar.

Answer 1

This way?

1. check if it is a symbol
2. evaluate the symbol using EVAL to get its value
3. check if the result is a procedure with PROCEDURE?