rotten news relay - comp.lang.lisp - Re: CL: Processing more than one element of a sequence at a time?

Subject: Re: CL: Processing more than one element of a sequence at a time?
From: B. Pym
Newsgroups: comp.lang.lisp
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Date: Mon, 19 Aug 2024 01:50 UTC

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From: Nobody447095@here-nor-there.org (B. Pym)
Newsgroups: comp.lang.lisp
Subject: Re: CL: Processing more than one element of a sequence at a time?
Date: Mon, 19 Aug 2024 01:50:18 -0000 (UTC)
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Frode V. Fjeld wrote:

> Raffaele Ricciardi <rfflrccrd@gmail.com> writes:
>
> > in CL, is there an idiomatic way to process more than one element of a
> > sequence at a time?
>
> Yes: (loop for (a b) on list by #'cddr collect (cons a b))
>
> Or without LOOP, I'd do:
>
> (do ((a (pop list) (pop list))
> (b (pop list) (pop list))
> (result nil))
> ((null list) (reverse result))
> (push (cons a b) result))

newLISP

(apply
(fn (result a b) (push (cons a b) result -1))
(cons '() '(f 3 g 4 h 5))
3 ;; How many items to process at a time.
)

((f 3) (g 4) (h 5))

Subject	Author
Re: CL: Processing more than one element of a sequence at a time?	B. Pym

You will not be elected to public office this year.

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