not - boolean negation
(import (rnrs)) ;R6RS
(import (rnrs base)) ;R6RS
(import (scheme r5rs)) ;R7RS
(import (scheme base)) ;R7RS
is false, and returns
Returns a single value; a boolean.
(not #t) => #f
(not 3) => #f
(not (list 3)) => #f
(not #f) => #t
(not '()) => #f
(not (list)) => #f
(not 'nil) => #f
This procedure works the same in all Schemes.
This procedure can raise exceptions with the following condition types:
- &assertion (R6RS)
The wrong number of arguments was passed.
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.
function has been in Scheme since the beginning, even when it ran on
MacLisp, and it was also present in LISP 1.5.
This page is part of the
It includes materials from the RnRS documents.
More information can be found at
Markup created by unroff 1.0sc, March 04, 2023.