Path: ...!eternal-september.org!feeder3.eternal-september.org!news.eternal-september.org!.POSTED!not-for-mail
From: Lawrence D'Oliveiro <ldo@nz.invalid>
Newsgroups: comp.lang.lisp
Subject: Re: when are macros useful?
Date: Sat, 6 Jul 2024 07:42:53 -0000 (UTC)
Organization: A noiseless patient Spider
Lines: 24
Message-ID: <v6asht$3nlvk$1@dont-email.me>
References: <v6769t$2ubtb$1@dont-email.me>
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
Injection-Date: Sat, 06 Jul 2024 09:42:53 +0200 (CEST)
Injection-Info: dont-email.me; posting-host="1bf6ca10d24952d079c382420ceea130";
	logging-data="3921908"; mail-complaints-to="abuse@eternal-september.org";	posting-account="U2FsdGVkX1/eX8Upvkpqd1jucH7aV32q"
User-Agent: Pan/0.158 (Avdiivka; )
Cancel-Lock: sha1:hNfimXN2kqXOlV70bfZHg2h7NYc=
Bytes: 1614

On Thu, 4 Jul 2024 22:04:48 -0000 (UTC), B. Pym wrote:

> (define-syntax ntimes
>   (syntax-rules ()
>     [(_ count forms ...)
>      (do ((n 0 (+ n 1)))
>        ((= n count))
>        forms ...)]))

I think it’s a sign of desperation when you hope that using different
kinds of bracketing symbols will somehow make your code clearer. The
screen/page is two-dimensional; why not make use of both dimensions in
laying out your code?

    (define-syntax ntimes
        (syntax-rules ()
            ((_ count forms ...)
                (do ((n 0 (+ n 1)))
                    ((= n count))
                    forms ...
                ) ; do
            )
        ) ; syntax-rules
    ) ; define