From: Juri Linkov <juri@jurta.org>
Cc: emacs-devel@gnu.org
Subject: Re: number-sequence
Date: Thu, 20 Nov 2003 15:27:22 +0200 [thread overview]
Message-ID: <87smkji35l.fsf@mail.jurta.org> (raw)
In-Reply-To: <200311200339.hAK3dGE07492@raven.dms.auburn.edu> (Luc Teirlinck's message of "Wed, 19 Nov 2003 21:39:16 -0600 (CST)")
Luc Teirlinck <teirllm@dms.auburn.edu> writes:
> (number-sequence 1 3 -1) or (number-sequence 1 3 0)
There is another case that makes sense: if INC is nil and TO is less
than FROM, then INC could default to -1, i.e.
(number-sequence 3 1) => (3 2 1)
To do this you could replace in your version:
- If INC is nil, it defaults to 1 (one).
+ If INC is nil, it defaults to 1 (one) if TO is larger than FROM,
+ or to -1 if TO is less than FROM.
- (or inc (setq inc 1))
+ (or inc (setq inc (if (< from to) 1 -1)))
BTW, it couldn't hurt to add examples to the docstring:
Examples:
(number-sequence 1) => (1)
(number-sequence 1 1) => (1)
(number-sequence 1 3) => (1 2 3)
(number-sequence 1 3 2) => (1 3)
(number-sequence 3 1) => (3 2 1)
(number-sequence 3 1 -2) => (3 1)
--
http://www.jurta.org/emacs/
next prev parent reply other threads:[~2003-11-20 13:27 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-11-20 3:39 number-sequence Luc Teirlinck
2003-11-20 10:39 ` number-sequence Kim F. Storm
2003-11-20 13:27 ` Juri Linkov [this message]
2003-11-21 4:37 ` number-sequence Luc Teirlinck
2003-11-21 12:06 ` number-sequence Kim F. Storm
2003-11-21 14:43 ` number-sequence Luc Teirlinck
2003-11-23 16:09 ` number-sequence Luc Teirlinck
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