procedure?(3scm) Scheme Programmer's Manual procedure?(3scm)

procedure? - test if an object is a procedure 

(import (rnrs))                     ;R6RS
(import (rnrs base))                ;R6RS
(import (scheme r5rs))              ;R7RS
(import (scheme base))              ;R7RS


(procedure? obj)

Returns #t if obj is a procedure, otherwise returns #f.

Returns a single boolean object as per the description. 

(procedure? 'car)           => #f
(procedure? (lambda (x) (* x x)))
                            => #t
(procedure? '(lambda (x) (* x x)))
                            => #f

This procedure can raise exceptions with the following condition types:
&assertion (R6RS)
The wrong number of arguments was passed.
R7RS
The assertions described above are errors. Implementations may signal an error, extend the procedure's domain of definition to include such arguments, or fail catastrophically.

R4RS, IEEE Scheme, R5RS, R6RS, R7RS

This page is part of the scheme-manpages project. It includes materials from the RnRS documents. More information can be found at https://weinholt.se/scheme/manpages/.

2021-01-17