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From: "B. Pym" <Nobody447095@here-nor-there.org>
Newsgroups: comp.lang.lisp,comp.lang.scheme
Subject: Re: applying macros
Date: Thu, 19 Sep 2024 07:32:45 -0000 (UTC)
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Rainer Joswig wrote:

> (defun average-function (list)
>   (assert list (list)
>           "List should not be empty.")
>   (loop for i from 0
>         for item in list
>         sum item into result
>         finally (return (/ result i))))

It's shorter in Gauche Scheme.

(define (average-function lst)
  (let1 n 0
    (/ (fold (lambda (x sum) (inc! n) (+ x sum)) 0 lst)
       n)))