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devel / comp.lang.lisp / the "loop" macro

the "loop" macro

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https://www.rocksolidbbs.com/devel/article-flat.php?id=16830&group=comp.lang.lisp#16830

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From: No_spamming@noWhere_7073.org (Robert L.)
Newsgroups: comp.lang.lisp
Subject: the "loop" macro
Date: Fri, 11 Feb 2022 09:56:37 -0000 (UTC)
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by: Robert L. - Fri, 11 Feb 2022 09:56 UTC

> The ability in loop to do even complex things like:
>
> (loop for x in '(1 2 3 4 5 6 7)
> when (evenp x)
> collect x into evens
> else
> collect x into odds
> finally
> (return (values evens odds)))
> => (2 4 6), (1 3 5 7)

Gauche, Chicken, or Racket

(use srfi-1) ;; partition for Gauche or Chicken
or
(require srfi/1) ;; partition for Racket

(partition even? '(2 3 4 5 6 7))
===>
(2 4 6)
(3 5 7)