* Negative nth index
@ 2024-12-22 5:43 Anand Tamariya
2024-12-22 7:39 ` Eli Zaretskii
2024-12-22 10:16 ` Andreas Schwab
0 siblings, 2 replies; 4+ messages in thread
From: Anand Tamariya @ 2024-12-22 5:43 UTC (permalink / raw)
To: Emacs Devel
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Should negative index for nth be valid? e.g.
(nth -1 '(1 2)) returns 1
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^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: Negative nth index
2024-12-22 5:43 Negative nth index Anand Tamariya
@ 2024-12-22 7:39 ` Eli Zaretskii
2024-12-22 9:01 ` Tassilo Horn
2024-12-22 10:16 ` Andreas Schwab
1 sibling, 1 reply; 4+ messages in thread
From: Eli Zaretskii @ 2024-12-22 7:39 UTC (permalink / raw)
To: Anand Tamariya; +Cc: emacs-devel
> From: Anand Tamariya <atamariya@gmail.com>
> Date: Sun, 22 Dec 2024 11:13:18 +0530
>
> Should negative index for nth be valid? e.g.
> (nth -1 '(1 2)) returns 1
What does this do in other Lisps?
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: Negative nth index
2024-12-22 7:39 ` Eli Zaretskii
@ 2024-12-22 9:01 ` Tassilo Horn
0 siblings, 0 replies; 4+ messages in thread
From: Tassilo Horn @ 2024-12-22 9:01 UTC (permalink / raw)
To: Eli Zaretskii; +Cc: Anand Tamariya, emacs-devel
Eli Zaretskii <eliz@gnu.org> writes:
>> Should negative index for nth be valid? e.g.
>> (nth -1 '(1 2)) returns 1
>
> What does this do in other Lisps?
In CL, it errors (ditto for nthcdr with negative index). Same for (nth
'(1 2 3) -1) in Clojure or (list-ref '(1 2 3) -1) in Scheme.
Bye,
Tassilo
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: Negative nth index
2024-12-22 5:43 Negative nth index Anand Tamariya
2024-12-22 7:39 ` Eli Zaretskii
@ 2024-12-22 10:16 ` Andreas Schwab
1 sibling, 0 replies; 4+ messages in thread
From: Andreas Schwab @ 2024-12-22 10:16 UTC (permalink / raw)
To: Anand Tamariya; +Cc: Emacs Devel
On Dez 22 2024, Anand Tamariya wrote:
> (nth -1 '(1 2)) returns 1
What would (nth -1 '#1=(1 2 . #1#)) return?
--
Andreas Schwab, schwab@linux-m68k.org
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"And now for something completely different."
^ permalink raw reply [flat|nested] 4+ messages in thread
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2024-12-22 5:43 Negative nth index Anand Tamariya
2024-12-22 7:39 ` Eli Zaretskii
2024-12-22 9:01 ` Tassilo Horn
2024-12-22 10:16 ` Andreas Schwab
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