From: "Stephen J. Turnbull" <stephen@xemacs.org>
Cc: emacs-devel@gnu.org
Subject: Re: maphash
Date: Thu, 24 Apr 2003 16:46:33 +0900 [thread overview]
Message-ID: <87sms88hie.fsf@tleepslib.sk.tsukuba.ac.jp> (raw)
In-Reply-To: <E198VtY-0000uc-00@fencepost.gnu.org> (Richard Stallman's message of "Wed, 23 Apr 2003 21:51:28 -0400")
>>>>> "rms" == Richard Stallman <rms@gnu.org> writes:
I have discovered by experimentation that maphash actually does what
I hoped it would, which is to pass key/value pairs to the mapping
function in the same order in which they were added to the table.
rms> An small anount of experimentation doesn't show you it will
rms> always to do that. It would be necessary to study the code
rms> and construct a proof, before we could promise this to the
rms> users.
If I understand the OP's description correctly, I can already promise
you that code depending on such a feature won't be portable to XEmacs:
(let ((my-hash (make-hash-table))
result)
(puthash "key1" "val1" my-hash)
(puthash "key2" "val2" my-hash)
(puthash "key3" "val3" my-hash)
(maphash (lambda (k v) (setq result (cons k result))) my-hash)
(reverse result))
=> ("key2" "key3" "key1")
--
Institute of Policy and Planning Sciences http://turnbull.sk.tsukuba.ac.jp
University of Tsukuba Tennodai 1-1-1 Tsukuba 305-8573 JAPAN
Ask not how you can "do" free software business;
ask what your business can "do for" free software.
next prev parent reply other threads:[~2003-04-24 7:46 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <p04310100bac9ebec6275@[198.17.100.22]>
2003-04-24 1:51 ` maphash Richard Stallman
2003-04-24 7:46 ` Stephen J. Turnbull [this message]
2003-04-24 21:58 ` maphash Greg Hill
2003-04-26 2:32 ` maphash Richard Stallman
2024-09-10 15:52 maphash Helmut Eller
2024-09-11 14:23 ` maphash Mattias Engdegård
2024-09-11 22:45 ` maphash Andrea Corallo
2024-09-28 8:42 ` maphash Eli Zaretskii
2024-09-30 14:29 ` maphash Andrea Corallo
2024-10-01 16:31 ` maphash Andrea Corallo
2024-10-01 16:59 ` maphash Mattias Engdegård
2024-10-01 18:36 ` maphash Andrea Corallo
2024-10-02 8:43 ` maphash Mattias Engdegård
2024-10-03 11:18 ` maphash Andrea Corallo
2024-10-04 8:30 ` maphash Mattias Engdegård
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