From: Emanuel Berg <incal@dataswamp.org>
To: help-gnu-emacs@gnu.org
Subject: Re: Easy to add with push but not to the end of a list
Date: Tue, 06 Dec 2022 03:40:02 +0100 [thread overview]
Message-ID: <871qpdgsql.fsf@dataswamp.org> (raw)
In-Reply-To: 87bkoh1dix.fsf@web.de
Michael Heerdegen wrote:
> What happens if you compile a file with these contents
> for example?
>
> (defun test ()
> (let ((l (list 1 2)))
> (push-last 2 l)
> l))
Okay, this then?
;;; -*- lexical-binding: t -*-
;;
;; this file:
;; https://dataswamp.org/~incal/emacs-init/list.el
(defmacro push-last (elem lst)
"Push ELEM to be the last element of LST.
Beware that this is O(n) while `push' is O(1)."
`(if (and (symbolp ,lst)
(not (symbol-value ,lst)) )
(setq ,lst (list ,elem))
(nconc ,lst (list ,elem)) ))
>> Here is the `push' macro - TBH, I don't know what most of
>> that means ...
>
> That supports generalized variables; you don't need to do
> that (unless you want to).
Just wonder why mine looks so different ...
--
underground experts united
https://dataswamp.org/~incal
next prev parent reply other threads:[~2022-12-06 2:40 UTC|newest]
Thread overview: 60+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-11-28 2:26 Easy to add with push but not to the end of a list Heime
2022-11-28 2:43 ` [External] : " Drew Adams
2022-11-28 3:45 ` Heime
2022-11-28 6:11 ` Drew Adams
2022-11-28 20:00 ` Emanuel Berg
2022-11-28 5:18 ` Stefan Monnier via Users list for the GNU Emacs text editor
2022-11-28 20:19 ` Emanuel Berg
2022-11-28 21:56 ` [External] : " Drew Adams
2022-11-28 22:45 ` Emanuel Berg
2022-11-28 22:01 ` Heime
2022-11-28 22:24 ` Stefan Monnier via Users list for the GNU Emacs text editor
2022-11-28 22:58 ` Emanuel Berg
2022-11-30 14:10 ` tomas
2022-11-30 16:12 ` Emanuel Berg
2022-11-28 22:46 ` Emanuel Berg
2022-11-28 22:50 ` Emanuel Berg
2022-11-29 5:23 ` tomas
2022-11-29 5:32 ` Emanuel Berg
2022-11-29 7:56 ` Heime
2022-11-29 8:33 ` Marcin Borkowski
2022-11-29 10:00 ` Emanuel Berg
2022-11-29 10:05 ` Emanuel Berg
2022-11-29 10:15 ` Heime
2022-11-29 8:38 ` tomas
2022-11-29 9:54 ` Emanuel Berg
2022-11-29 8:17 ` Marcin Borkowski
2022-11-29 8:44 ` tomas
2022-11-29 12:08 ` Dr Rainer Woitok
2022-11-29 19:54 ` Of cars and mice [was: Easy to add with push but not to the end of a list] tomas
2022-11-30 1:17 ` Emanuel Berg
2022-11-30 1:13 ` Easy to add with push but not to the end of a list Emanuel Berg
2022-11-28 19:59 ` Emanuel Berg
2022-11-28 21:56 ` [External] : " Drew Adams
2022-11-28 22:18 ` Heime
2022-11-28 22:41 ` Drew Adams
2022-11-29 11:17 ` Dr Rainer Woitok
2022-11-30 17:10 ` Michael Heerdegen
2022-11-30 18:17 ` [External] : " Drew Adams
2022-11-30 19:30 ` Emanuel Berg
2022-12-01 15:11 ` Michael Heerdegen
2022-12-01 17:25 ` Emanuel Berg
2022-12-03 21:29 ` Michael Heerdegen
2022-12-05 23:35 ` Emanuel Berg
2022-12-06 1:36 ` Michael Heerdegen
2022-12-06 1:43 ` Emanuel Berg
2022-12-06 2:17 ` Michael Heerdegen
2022-12-06 2:40 ` Emanuel Berg [this message]
2022-12-06 13:56 ` Stefan Monnier via Users list for the GNU Emacs text editor
2022-12-06 14:45 ` Michael Heerdegen
2022-12-06 2:52 ` Emanuel Berg
2022-12-06 17:22 ` Michael Heerdegen
2022-12-06 22:30 ` Emanuel Berg
2022-12-08 23:15 ` Michael Heerdegen
2022-12-28 23:52 ` Emanuel Berg
2022-12-31 16:57 ` Michael Heerdegen
2022-12-31 22:09 ` Emanuel Berg
2023-01-01 12:16 ` Michael Heerdegen
2023-01-08 4:40 ` Emanuel Berg
2023-01-09 6:32 ` Emanuel Berg
2023-01-14 12:05 ` Michael Heerdegen
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