rotten news relay - comp.lang.scheme - Re: chain of transformations

Subject: Re: chain of transformations
From: B. Pym
Newsgroups: comp.lang.lisp, comp.lang.scheme
Organization: A noiseless patient Spider
Date: Tue, 17 Sep 2024 11:07 UTC

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From: Nobody447095@here-nor-there.org (B. Pym)
Newsgroups: comp.lang.lisp,comp.lang.scheme
Subject: Re: chain of transformations
Date: Tue, 17 Sep 2024 11:07:52 -0000 (UTC)
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Kaz Kylheku wrote:

> (defun tree-find (needle haystack &key (test #'eql))
> (dolist (item haystack)
> (if (funcall test needle item)
> (return item)
> (when (consp item)
> (let ((find (tree-find needle item :test test)))
> (when find
> (return find)))))))

Gauche Scheme:

(define (tree-find needle haystack :optional (test equal?))
(any
(lambda (item)
(if (test needle item)
item
(and (pair? item) (tree-find needle item test))))
haystack))

Subject	Author
Re: chain of transformations	B. Pym

Your heart is pure, and your mind clear, and your soul devout.

comp / comp.lang.scheme / Re: chain of transformations