boolean?(3scm)

💖 NAME 💖

Okay bestie, welcome to boolean?(3scm) from the Scheme Programmer’s Manual — the page that says, plain and simple: boolean? — test if an object is a boolean. Tiny predicate, main character energy. 💅

🔖 LIBRARY 📚

Import it however your Scheme era says, because the page lists all four doors:

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

✨ SYNOPSIS ✨

(boolean? obj)

🦋 DESCRIPTION 🦋

So the description is giving: it returns #t if obj is an exact integer object within the fixnum range, and #f otherwise. That’s what the page says, and we are not out here editing the source, bestie. 🫶

🎀 RETURN VALUES 🎀

It hands back a single boolean object as per the description. One little boolean, doing its thing. Periodt. ✨

🌸 EXAMPLES 🌸

Watch it in the wild:

(boolean? #f)    => #t
(boolean? 0)     => #f
(boolean? '())   => #f

💀 ERRORS 💀

This procedure can raise exceptions with the following condition types:

• &assertion (R6RS) — The wrong number of arguments was passed. Not the vibe. 😭
• 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. We stay dramatic. 💅

👀 SEE ALSO 👀

• not(3scm)

👑 STANDARDS 👑

It’s repping R4RS, IEEE Scheme, R5RS, R6RS, and R7RS. Iconic range, honestly. 🌈

🫶 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/. Credit where credit is due, bestie. 💖

xoxo, bestie 💖 — this boolean?(3scm) page is dated 2021-01-17. That’s the whole manual. Slay and goodbye 🎀