not(3scm)

🌸 NAME 🌸

okay so this is not(3scm) from the Scheme Programmer's Manual, and it's literally the page for boolean negation 💅 not is the tiny icon that flips your truthiness vibe. Periodt.

🎀 LIBRARY 🎀

Import it from whichever flavor you're on, bestie:

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

✨ SYNOPSIS ✨

(not obj)

💅 DESCRIPTION 💅

Returns #t if obj is false, and returns #f otherwise. It's giving simple, iconic, no notes 🫶

🫶 RETURN VALUES 🫶

Vibe check: it returns a single value, and that value is a boolean. Slay.

🍓 EXAMPLES 🍓

(not #t)         =>  #f
(not 3)          =>  #f
(not (list 3))   =>  #f
(not #f)         =>  #t
(not '())        =>  #f
(not (list))     =>  #f
(not 'nil)       =>  #f

🦋 COMPATIBILITY 🦋

This procedure works the same in all Schemes. No cap, fr fr.

💀 ERRORS 💀

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. Yes, catastrophically 😭

🔥 SEE ALSO 🔥

Go peek at if(7scm) and boolean=?(3scm) 👀

🌈 STANDARDS 🌈

Certified by: R4RS, IEEE Scheme, R5RS, R6RS, R7RS. The whole lineup ate ✨

👑 HISTORY 👑

The not function has been in Scheme since the beginning, even when it ran on MacLisp, and it was also present in LISP 1.5. Like, it's been that girl forever 💜

💜 AUTHORS 💜

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

later bestie 💖 this cutie is not(3scm) from the Scheme Programmer's Manual, dated 2022-05-07 ✨