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From: "B. Pym" <No_spamming@noWhere_7073.org>
Newsgroups: comp.lang.lisp
Subject: Re: CAR/CDR vs FIRST/REST
Date: Tue, 2 Jul 2024 21:33:23 -0000 (UTC)
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Barry Margolin wrote:

> >       (mapcan #'(lambda (x) (and (numberp x) (list x))) list)
> 
> >       (loop for x in list
> >               when (numberp x) collect x)
> 
> I agree with this example.  Once I learned LOOP I never used the
> above idiom again.


(filter number? '(a b c 1 2 3))
 ===>
(1 2 3)