rotten news relay - comp.lang.lisp - Re: Question about loop

Subject: Re: Question about loop
From: B. Pym
Newsgroups: comp.lang.lisp
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Date: Mon, 26 Aug 2024 08:14 UTC

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From: Nobody447095@here-nor-there.org (B. Pym)
Newsgroups: comp.lang.lisp
Subject: Re: Question about loop
Date: Mon, 26 Aug 2024 08:14:45 -0000 (UTC)
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Pascal Costanza wrote:

> Jeff Barnett wrote:
> > Does the Common Lisp spec say anything about whether the following is
> > well defined given that the elements of "list" are unique:
> >
> > (loop for x in list
> > when (p x)
> > do (setq list (delete x list)))
>
> See http://www.lispworks.com/documentation/HyperSpec/Body/03_f.htm
>
> But I wouldn't worry too much and just switch to a non-destructive version:
>
> (loop for x in list
> unless (p x) collect x into new-list
> finally (setq list new-list))

Gauche Scheme:

(remove odd? (iota 22))
===>
(0 2 4 6 8 10 12 14 16 18 20)

Subject	Author
Re: Question about loop	B. Pym

The ripest fruit falls first. -- William Shakespeare, "Richard II"

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