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From: "B. Pym" <Nobody447095@here-nor-there.org>
Newsgroups: comp.lang.lisp,comp.lang.scheme
Subject: Re: "Higher Order Perl" book and Lisp
Date: Mon, 2 Sep 2024 19:48:36 -0000 (UTC)
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> >>(loop for i from 0 to 100 with c = 0 finally (return c) do
> >>  (loop for d across (format nil "~A" i) do (when (char= d #\5) (incf c))))
> >
> >
> > How about:
> >
> > (loop for i from 0 to 100 sum (count #\5 (princ-to-string i)))
> >
> 
> (count #\5 (format nil "~{~A~}" (loop for i to 100 collect i)))

Gauche Scheme

(use srfi-13) ;; string-count

(string-count (x->string (iota 100)) #\5)
  ===>
20