From: Michael Heerdegen via "Bug reports for GNU Emacs, the Swiss army knife of text editors" <bug-gnu-emacs@gnu.org>
To: Stefan Kangas <stefankangas@gmail.com>
Cc: Jim Porter <jporterbugs@gmail.com>,
73853@debbugs.gnu.org, monnier@iro.umontreal.ca,
Sean Whitton <spwhitton@spwhitton.name>
Subject: bug#73853: 31.0.50; Should and-let* become a synonym for when-let*?
Date: Sun, 27 Oct 2024 10:16:00 +0100 [thread overview]
Message-ID: <87msipkisv.fsf@web.de> (raw)
In-Reply-To: <CADwFkm=uWFSj1wLbGhm00-oz9AtXAGN7BsC_e+yJ5bOxNkszSw@mail.gmail.com> (Stefan Kangas's message of "Sun, 27 Oct 2024 00:08:20 -0700")
Stefan Kangas <stefankangas@gmail.com> writes:
> Jim Porter <jporterbugs@gmail.com> writes:
>
> > On the other hand, the way bindings work in 'if-let*' and 'when-let*'
> > are closer to 'let*' than 'let'. I think that's a false friend though,
> > since they're only similar, not actually the same (of course the
> > semantics couldn't be exactly the same or there'd be no reason for
> > 'if-let*' and 'when-let*' to exist).
>
> FWIW, this is the argument that convinced me that the `*`-versions are
> better: bindings are more like in `let` than in `let*`. To my mind,
> that makes the `*`-naming more self-documenting and clear.
In the meantime I found out that I am not as decided as I thought:
I am actually using both versions in my own code. Valid arguments for
either name exist - and it even depends on the case:
In this case I prefer the name without star:
#+begin_src emacs-lisp
(if-let ((a (does-an-a-exist?-then-return-it)))
(use a)
(do-something-else))
#+end_src
Here I prefer the name with star:
#+begin_src emacs-lisp
(and-let* ((a (an-a-exists))
(b (b-depending-on-a-also-exists)))
(test-using a b))
#+end_src
Thinking the first example further we could introduce parallel versions
and name them `if-let', `when-let' and `and-let'. They would be really
analogue to `let' with respect to binding list semantics - compared to
the non-parallel counterparts `if-let*' that are what we have now.
ATM this idea looks appealing to me as a final goal.
Michael.
next prev parent reply other threads:[~2024-10-27 9:16 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-10-17 16:27 bug#73853: 31.0.50; and-let* is useless Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors
2024-10-17 16:40 ` Drew Adams via Bug reports for GNU Emacs, the Swiss army knife of text editors
2024-10-18 2:11 ` Michael Heerdegen via Bug reports for GNU Emacs, the Swiss army knife of text editors
2024-10-18 23:42 ` Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors
2024-10-19 3:50 ` Michael Heerdegen via Bug reports for GNU Emacs, the Swiss army knife of text editors
2024-10-21 7:07 ` Augusto Stoffel
2024-10-21 8:57 ` Michael Heerdegen via Bug reports for GNU Emacs, the Swiss army knife of text editors
2024-10-21 12:09 ` Sean Whitton
2024-10-19 3:38 ` Sean Whitton
2024-10-20 12:24 ` Stefan Kangas
2024-10-22 14:47 ` bug#73853: 31.0.50; Should and-let* become a synonym for when-let*? Sean Whitton
2024-10-22 15:24 ` Michael Heerdegen via Bug reports for GNU Emacs, the Swiss army knife of text editors
2024-10-23 14:05 ` Stefan Kangas
2024-10-24 8:51 ` Sean Whitton
2024-10-25 12:09 ` Sean Whitton
2024-10-30 9:42 ` Michael Albinus via Bug reports for GNU Emacs, the Swiss army knife of text editors
2024-10-26 19:25 ` Jim Porter
2024-10-27 7:08 ` Stefan Kangas
2024-10-27 9:16 ` Michael Heerdegen via Bug reports for GNU Emacs, the Swiss army knife of text editors [this message]
2024-10-27 10:12 ` Michael Albinus via Bug reports for GNU Emacs, the Swiss army knife of text editors
2024-10-27 11:24 ` Michael Heerdegen via Bug reports for GNU Emacs, the Swiss army knife of text editors
2024-10-27 11:32 ` Sean Whitton
2024-10-27 11:44 ` Michael Albinus via Bug reports for GNU Emacs, the Swiss army knife of text editors
2024-10-27 12:28 ` Michael Heerdegen via Bug reports for GNU Emacs, the Swiss army knife of text editors
2024-10-27 13:10 ` Sean Whitton
2024-10-27 13:22 ` Michael Albinus via Bug reports for GNU Emacs, the Swiss army knife of text editors
2024-10-28 9:39 ` Michael Heerdegen via Bug reports for GNU Emacs, the Swiss army knife of text editors
2024-10-27 14:41 ` Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors
2024-10-28 13:58 ` Michael Heerdegen via Bug reports for GNU Emacs, the Swiss army knife of text editors
2024-10-28 14:32 ` Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors
2024-10-27 20:00 ` Drew Adams via Bug reports for GNU Emacs, the Swiss army knife of text editors
2024-10-28 2:15 ` Howard Melman
2024-10-28 3:19 ` Sean Whitton
2024-10-29 15:21 ` Jonas Bernoulli
2024-10-29 16:36 ` Drew Adams via Bug reports for GNU Emacs, the Swiss army knife of text editors
2024-10-30 0:49 ` Sean Whitton
2024-10-30 12:55 ` Corwin Brust
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