From: Lars Ingebrigtsen <larsi@gnus.org>
To: Augusto Stoffel <arstoffel@gmail.com>
Cc: emacs-devel@gnu.org
Subject: Re: Improve `replace-regexp-in-string' ergonomics?
Date: Wed, 22 Sep 2021 22:06:41 +0200 [thread overview]
Message-ID: <87zgs4tlwu.fsf@gnus.org> (raw)
In-Reply-To: <8735pxjabj.fsf@gmail.com> (Augusto Stoffel's message of "Wed, 22 Sep 2021 10:14:56 +0200")
Augusto Stoffel <arstoffel@gmail.com> writes:
> Clojure has a moderately useful named variant of the threading macro for
> this kind of situation:
>
> (as-> expr name & forms)
>
> Binds name to expr, evaluates the first form in the lexical context
> of that binding, then binds name to that result, repeating for each
> successive form, returning the result of the last form.
>
> (I guess I would have chosen the opposite order of the 'expr' and 'name'
> arguments, though.)
Yeah, you really need something like that to actually do threading in a
Lispish language. But it feels very hackish indeed. Example from the
man page:
(as-> owners $ (nth $ 0) (:pets $) (deref $) ($ 1) ($ :type))
It's like... revenge of the Perl.
Threading works a lot better in languages that are designed around it --
i.e., languages that have a consistent parameter placement, and doesn't
have optional parameters. (Instead they introduce new functions when a
Lispish language introduces an optional parameter.)
Threading feels more like a neat hack in Lispish languages than actually
useful.
--
(domestic pets only, the antidote for overdose, milk.)
bloggy blog: http://lars.ingebrigtsen.no
next prev parent reply other threads:[~2021-09-22 20:06 UTC|newest]
Thread overview: 41+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-09-22 4:36 Improve `replace-regexp-in-string' ergonomics? Lars Ingebrigtsen
2021-09-22 5:22 ` Yuri Khan
2021-09-22 6:36 ` Lars Ingebrigtsen
2021-09-22 7:47 ` Thierry Volpiatto
2021-09-22 5:24 ` Po Lu
2021-09-22 6:37 ` Lars Ingebrigtsen
2021-09-22 10:56 ` Po Lu
2021-09-22 20:08 ` Lars Ingebrigtsen
2021-09-23 0:11 ` Po Lu
2021-09-22 7:33 ` Adam Porter
2021-09-22 8:09 ` Lars Ingebrigtsen
2021-09-22 7:51 ` Andreas Schwab
2021-09-22 8:14 ` Augusto Stoffel
2021-09-22 8:21 ` Adam Porter
2021-09-22 18:01 ` Stefan Monnier
2021-09-22 18:24 ` Basil L. Contovounesios
2021-09-22 22:56 ` Adam Porter
2021-09-22 23:53 ` Eric Abrahamsen
2021-09-22 20:06 ` Lars Ingebrigtsen [this message]
2021-09-22 10:59 ` Dmitry Gutov
2021-09-22 20:18 ` Lars Ingebrigtsen
2021-09-22 22:23 ` Dmitry Gutov
2021-09-22 23:24 ` [External] : " Drew Adams
2021-09-22 18:14 ` Stefan Monnier
2021-09-22 19:30 ` Mattias Engdegård
2021-09-22 20:22 ` Lars Ingebrigtsen
2021-09-22 20:29 ` Lars Ingebrigtsen
2021-09-23 2:15 ` Stefan Monnier
2021-10-05 16:18 ` Juri Linkov
2021-10-12 6:53 ` Juri Linkov
2021-10-12 12:10 ` Lars Ingebrigtsen
2021-10-12 12:34 ` Stefan Monnier
2021-10-12 12:41 ` Lars Ingebrigtsen
2021-10-12 13:18 ` Lars Ingebrigtsen
2021-10-12 13:32 ` Mattias Engdegård
2021-10-12 15:48 ` Stefan Monnier
2021-10-12 13:33 ` Thierry Volpiatto
2021-10-12 19:16 ` Juri Linkov
2021-10-12 20:44 ` Thierry Volpiatto
2021-10-13 7:57 ` Juri Linkov
2021-10-13 8:41 ` Thierry Volpiatto
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