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From: Drew Adams <drew.adams@oracle.com>
To: David Kastrup <dak@gnu.org>, Stefan Monnier <monnier@iro.umontreal.ca>
Cc: Mark Oteiza <mvoteiza@udel.edu>,
	Nicolas Petton <nicolas@petton.fr>,
	emacs-devel@gnu.org
Subject: RE: seq-some-p and nil
Date: Tue, 8 Sep 2015 10:08:41 -0700 (PDT)	[thread overview]
Message-ID: <3dc0f1d9-caf1-446a-ab14-2b3e210a02e7@default> (raw)
In-Reply-To: <87pp1s976u.fsf@fencepost.gnu.org>

> >> To make things easier to understand, I'm taking the example of finding
> >> the first odd number in a seq:
> >
> > I've never needed to do that.
> 
> Marvelous.

;-)

Was there something wrong with the suggestion to return,
as the non-nil value, a cons (ELEMENT . VALUE)?

(Where ELEMENT is the sequence element that satisfies the
predicate, and VALUE is the return value of the predicate
for that element.)

That gives you "some" element that satisfies the predicate
(the first such).  And it gives you the result of the test.
Each of these can be useful, depending on the context.




  reply	other threads:[~2015-09-08 17:08 UTC|newest]

Thread overview: 54+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-09-03 15:50 seq-some-p and nil Simen Heggestøyl
2015-09-03 16:42 ` Stefan Monnier
2015-09-03 17:19   ` Artur Malabarba
2015-09-03 17:35     ` John Mastro
2015-09-03 17:50       ` Drew Adams
2015-09-03 19:36         ` Nicolas Petton
2015-09-03 19:45       ` Nicolas Petton
2015-09-06  1:17         ` Mark Oteiza
2015-09-06 20:48           ` Nicolas Petton
2015-09-06 21:46           ` Stefan Monnier
2015-09-07  6:11             ` Nicolas Petton
2015-09-07  8:06               ` Drew Adams
2015-09-07 15:19                 ` Stefan Monnier
2015-09-07 15:23                   ` Mark Oteiza
2015-09-07 17:08                   ` Drew Adams
2015-09-07 20:44                   ` Nicolas Petton
2015-09-07 22:27                     ` Stefan Monnier
2015-09-08  7:09                       ` Nicolas Petton
2015-09-08 12:36                         ` Stefan Monnier
2015-09-08 13:07                           ` Nicolas Petton
2015-09-08 16:49                             ` Stefan Monnier
2015-09-08 17:01                               ` David Kastrup
2015-09-08 17:08                                 ` Drew Adams [this message]
2015-09-08 19:02                                   ` Nicolas Petton
2015-09-08 19:48                                     ` Drew Adams
2015-09-09  7:56                                       ` Nicolas Petton
2015-09-09 13:26                                         ` Drew Adams
2015-09-09 17:45                                           ` Stefan Monnier
2015-09-09 17:53                                             ` Drew Adams
2015-09-09 20:24                                               ` Stefan Monnier
2015-09-09 20:46                                                 ` Drew Adams
2015-09-09 21:44                                           ` Nicolas Petton
2015-09-08 18:43                                 ` Stefan Monnier
2015-09-08 19:03                                   ` David Kastrup
2015-09-08 18:59                               ` Nicolas Petton
2015-09-08 19:06                                 ` David Kastrup
2015-09-08 20:33                                 ` Stefan Monnier
2015-09-09  7:57                                   ` Nicolas Petton
2015-09-08 13:21                           ` Nicolas Petton
2015-09-08 13:37                             ` Mark Oteiza
2015-09-08 17:50                               ` Stefan Monnier
2015-09-09  2:19                                 ` Mark Oteiza
2015-09-09  4:28                                   ` Stephen J. Turnbull
2015-09-09  4:57                                     ` Mark Oteiza
2015-09-07 20:45                   ` Nicolas Petton
2015-09-03 19:40 ` Nicolas Petton
2015-09-10 17:46   ` Simen Heggestøyl
2015-09-10 22:12     ` Nicolas Petton
2015-09-22 17:17       ` Simen Heggestøyl
2015-09-23  8:38         ` Nicolas Petton
2015-09-23  8:44           ` David Kastrup
2015-09-23  8:48           ` Simen Heggestøyl
2015-09-23 10:57             ` Nicolas Petton
2015-09-28 19:17         ` Nicolas Petton

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