From: Sean Whitton <spwhitton@spwhitton.name>
To: 73853@debbugs.gnu.org
Cc: Michael Heerdegen <michael_heerdegen@web.de>, monnier@iro.umontreal.ca
Subject: bug#73853: 31.0.50; and-let* is useless
Date: Sat, 19 Oct 2024 11:38:01 +0800 [thread overview]
Message-ID: <87froszrs6.fsf@melete.silentflame.com> (raw)
In-Reply-To: <87a5f2xir8.fsf@web.de> (Michael Heerdegen via's message of "Fri, 18 Oct 2024 04:11:23 +0200")
Hello,
On Fri 18 Oct 2024 at 04:11am +02, Michael Heerdegen via "Bug reports for GNU Emacs, the Swiss army knife of text editors" wrote:
> `and-let*'s purpose is to express conditions, `when-let*'s is
> conditional evaluation. We have `and-let*' and `when-let*' for the
> same reason we have `and' and `when'. See prior discussions.
Right. The Lisp convention of using `when' for pure control flow and
`and' for returning values is a good aid to readability.
If we don't have and-let*, then we can't use this convention in the case
that we also want to bind variables.
So, I am very keen for and-let* to remain.
>> [ I think we have too many (if|when|and)-let(*) for our own good: we
>> should pick some winners and deprecate the other ones. ]
>
> AFAIR the non-star versions exist for backward compatibility only - so
> I would rather get rid of these. Parallel existence of these non-star
> vs. star versions should be a temporary state, it complicates the
> matter for an epsilon gain.
Yes. I would like us to move forward with removing the non-star ones.
I believe there was a previous attempt to deprecate them but it had to
be backed out. But maybe now is the time to try again.
--
Sean Whitton
prev parent reply other threads:[~2024-10-19 3:38 UTC|newest]
Thread overview: 6+ 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
2024-10-19 3:38 ` Sean Whitton [this message]
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