From: John Mastro <john.b.mastro@gmail.com>
To: "help-gnu-emacs@gnu.org" <help-gnu-emacs@gnu.org>
Subject: Re: How to delete all nil properties from a plist?
Date: Wed, 5 Aug 2015 18:07:16 -0700 [thread overview]
Message-ID: <CAOj2CQQ8PFfUnkCwuPtJht+AMAy8A8aOJFTj+i_3uUosHm0Osw@mail.gmail.com> (raw)
In-Reply-To: <CAOj2CQRdOVbJwGtgLV9v3J_jq6d6pOts-QRd2Uorw6NAymMXxw@mail.gmail.com>
> (defun plist-drop-nil-props (plist)
> (let* ((result (list 'head))
> (last result))
> (cl-loop for (key val) on plist by #'cddr do
> (when-let (new (and val (list key val)))
> (setcdr last new)
> (setq last (cdr new))))
> (cdr result)))
Or the same thing with `while' in place of `cl-loop':
(defun drop-nil-props (plist)
(let* ((result (list 'head))
(last result))
(while plist
(let* ((key (pop plist))
(val (pop plist))
(new (and val (list key val))))
(when new
(setcdr last new)
(setq last (cdr new)))))
(cdr result)))
--
john
next prev parent reply other threads:[~2015-08-06 1:07 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-08-01 22:03 How to delete all nil properties from a plist? Marcin Borkowski
2015-08-01 22:11 ` Marcin Borkowski
2015-08-02 1:32 ` Emanuel Berg
[not found] ` <mailman.7753.1438479312.904.help-gnu-emacs@gnu.org>
2015-08-02 1:36 ` Pascal J. Bourguignon
2015-08-02 1:50 ` Emanuel Berg
2015-08-02 3:55 ` Rusi
2015-08-02 16:21 ` Pascal J. Bourguignon
[not found] ` <mailman.7754.1438480361.904.help-gnu-emacs@gnu.org>
2015-08-02 16:24 ` Pascal J. Bourguignon
2015-08-05 23:08 ` Emanuel Berg
[not found] ` <mailman.7864.1438816202.904.help-gnu-emacs@gnu.org>
2015-08-05 23:30 ` Pascal J. Bourguignon
2015-08-05 23:49 ` Emanuel Berg
2015-08-06 0:30 ` Emanuel Berg
2015-08-06 1:05 ` John Mastro
2015-08-06 1:07 ` John Mastro [this message]
[not found] ` <mailman.7867.1438818687.904.help-gnu-emacs@gnu.org>
2015-08-06 2:32 ` Pascal J. Bourguignon
2015-08-07 22:21 ` Emanuel Berg
[not found] ` <mailman.7869.1438821124.904.help-gnu-emacs@gnu.org>
2015-08-06 2:40 ` Pascal J. Bourguignon
2015-08-07 22:32 ` Emanuel Berg
[not found] ` <mailman.7963.1438986782.904.help-gnu-emacs@gnu.org>
2015-08-08 3:56 ` Pascal J. Bourguignon
2015-08-09 1:34 ` Emanuel Berg
[not found] ` <mailman.7996.1439084206.904.help-gnu-emacs@gnu.org>
2015-08-09 2:18 ` Pascal J. Bourguignon
2015-08-09 2:28 ` Emanuel Berg
[not found] ` <mailman.7749.1438467076.904.help-gnu-emacs@gnu.org>
2015-08-01 23:46 ` Pascal J. Bourguignon
[not found] <mailman.7748.1438466648.904.help-gnu-emacs@gnu.org>
2015-08-01 23:43 ` Pascal J. Bourguignon
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