From: Drew Adams <drew.adams@oracle.com>
To: Teemu Likonen <tlikonen@iki.fi>,
Lars Ingebrigtsen <larsi@gnus.org>, Pip Cet <pipcet@gmail.com>
Cc: "Basil L. Contovounesios" <contovob@tcd.ie>,
"emacs-devel@gnu.org" <emacs-devel@gnu.org>
Subject: RE: [External] : Re: Always-true predicate?
Date: Wed, 17 Feb 2021 22:25:33 +0000 [thread overview]
Message-ID: <SA2PR10MB4474D992434F23C4DFE35FF8F3869@SA2PR10MB4474.namprd10.prod.outlook.com> (raw)
In-Reply-To: <874kiaxxbs.fsf@iki.fi>
> Could you please make it optional? So that those who want the new
> behaviour of (apply nil) can get it by doing something like:
>
> M-x customize-variable RET apply-nil-will-not-segfault-anymore RET
>
> There are many users and third-party packages which depend on the old
> behaviour. I'll show you stats in a minute...
>
> Seriously: I remember one case when I tried to find CONSTANTLY or
> similar but failed. I wrote some LAMBDA form. No big deal.
Agreed, no big deal.
___
But if it's decided to do this, then clearly a function
that accepts an optional arg and just returns that arg
is preferable to either one that always returns `t' or
one that requires (instead of just accepts) an arg.
And the name `constantly' has a connotation of
repetition, which isn't relevant. This is essentially
just the SKI logical combinator `K'. Call it `constant'
or some such, perhaps.
OTOH, with Lisp, if the argument can return different
values when its evaluated then this really isn't a
constant-returning function.
___
But again, I agree with Teemu: YAGNI.
next prev parent reply other threads:[~2021-02-17 22:25 UTC|newest]
Thread overview: 51+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-02-17 12:01 Always-true predicate? Lars Ingebrigtsen
2021-02-17 12:31 ` Andrea Corallo via Emacs development discussions.
2021-02-17 12:40 ` Lars Ingebrigtsen
2021-02-17 16:59 ` Barry Fishman
2021-02-19 15:24 ` Stefan Kangas
2021-02-17 13:16 ` Basil L. Contovounesios
2021-02-17 18:56 ` Pip Cet
2021-02-17 19:19 ` Lars Ingebrigtsen
2021-02-17 19:31 ` Pip Cet
2021-02-17 19:37 ` Lars Ingebrigtsen
2021-02-17 20:18 ` Teemu Likonen
2021-02-17 22:25 ` Drew Adams [this message]
2021-02-17 23:04 ` [External] : " Basil L. Contovounesios
2021-02-17 23:13 ` Drew Adams
2021-02-17 23:01 ` Stefan Monnier
2021-02-19 11:27 ` Pip Cet
2021-02-19 15:07 ` Stefan Monnier
2021-02-19 19:04 ` Pip Cet
2021-02-19 20:11 ` Stefan Monnier
2021-02-20 9:40 ` Pip Cet
2021-02-20 13:58 ` Stefan Monnier
2021-02-19 5:39 ` Richard Stallman
2021-02-19 8:52 ` Robert Pluim
2021-02-19 9:10 ` Eli Zaretskii
2021-02-19 12:12 ` Eli Zaretskii
2021-02-19 12:52 ` Stefan Kangas
2021-02-19 13:00 ` Lars Ingebrigtsen
2021-02-19 13:34 ` Eli Zaretskii
2021-02-19 13:40 ` Lars Ingebrigtsen
2021-02-19 13:53 ` Eli Zaretskii
2021-02-19 14:05 ` Lars Ingebrigtsen
2021-02-19 18:04 ` [External] : " Drew Adams
2021-02-19 14:42 ` Stefan Monnier
2021-02-20 12:47 ` Lars Ingebrigtsen
2021-02-20 12:49 ` Lars Ingebrigtsen
2021-02-20 14:03 ` Stefan Monnier
2021-02-20 14:20 ` Lars Ingebrigtsen
2021-02-20 14:55 ` Stefan Monnier
2021-02-20 15:05 ` Lars Ingebrigtsen
2021-02-20 15:21 ` Stefan Monnier
2021-02-21 12:50 ` Robert Pluim
2021-02-21 13:04 ` Lars Ingebrigtsen
2021-02-19 15:09 ` Stefan Kangas
2021-02-19 15:22 ` Eli Zaretskii
2021-02-19 18:17 ` [External] : " Drew Adams
2021-02-19 18:41 ` Eli Zaretskii
2021-02-22 5:02 ` chad
2021-02-22 15:20 ` Eli Zaretskii
2021-02-22 23:07 ` chad
2021-02-21 6:12 ` Richard Stallman
2021-02-21 15:12 ` Eli Zaretskii
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