[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: How to delete all nil properties from a plist?
From: |
Pascal J. Bourguignon |
Subject: |
Re: How to delete all nil properties from a plist? |
Date: |
Sun, 02 Aug 2015 01:46:51 +0200 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/24.3 (gnu/linux) |
Marcin Borkowski <mbork@mbork.pl> writes:
> OK, so what about this? Is there a better way (which would probably
> mean, is such function already defined)?
>
> (defun alist-clear (alist)
> "Return ALIST with all pairs with nil value deleted."
> (if alist
Better use when in this case.
> (if (cdar alist)
> (cons (car alist)
> (alist-clear (cdr alist)))
The bad thing (shared with your plist-clear) of this, is that it's a
non-terminal recursive call, and therefore it will use O(n) stack space
with n = (length alist). Ie. it will break for not so long alists.
See the variable max-lisp-eval-depth.
> (alist-clear (cdr alist)))))
--
__Pascal Bourguignon__ http://www.informatimago.com/
“The factory of the future will have only two employees, a man and a
dog. The man will be there to feed the dog. The dog will be there to
keep the man from touching the equipment.” -- Carl Bass CEO Autodesk
- Re: How to delete all nil properties from a plist?, (continued)
- Message not available
- Re: How to delete all nil properties from a plist?, Pascal J. Bourguignon, 2015/08/05
- Re: How to delete all nil properties from a plist?, Emanuel Berg, 2015/08/07
- Message not available
- Re: How to delete all nil properties from a plist?, Pascal J. Bourguignon, 2015/08/05
- Re: How to delete all nil properties from a plist?, Emanuel Berg, 2015/08/07
- Message not available
- Re: How to delete all nil properties from a plist?, Pascal J. Bourguignon, 2015/08/08
- Re: How to delete all nil properties from a plist?, Emanuel Berg, 2015/08/08
- Message not available
- Re: How to delete all nil properties from a plist?, Pascal J. Bourguignon, 2015/08/08
- Re: How to delete all nil properties from a plist?, Emanuel Berg, 2015/08/08
Message not available
- Re: How to delete all nil properties from a plist?,
Pascal J. Bourguignon <=
Re: How to delete all nil properties from a plist?, Pascal J. Bourguignon, 2015/08/01