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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 03:36:22 +0200 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/24.3 (gnu/linux) |
Emanuel Berg <embe8573@student.uu.se> writes:
> Marcin Borkowski <mbork@mbork.pl> writes:
>
>>> Hi all, so I'm still using plists, though I'm less
>>> and less sure that they are actually better than
>>> alists for my use-case. Now I need to delete all
>>> properties whose value is nil. I'm using this
>>> function:
>
> Try this:
>
> (require 'cl)
>
> (defun plist-drop-nil-props (l)
> (let((new)
> (prop nil) )
> (cl-loop for x in l
> do (if (or (setq prop (not prop)) x)
> (setq new (append new (list x)))
> (setq new (butlast new))))
> new))
This is horrible. Again, you can't prevent yourself writing O(n²) code
when O(n) would do perfectly.
--
__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
- How to delete all nil properties from a plist?, Marcin Borkowski, 2015/08/01
- Re: How to delete all nil properties from a plist?, Marcin Borkowski, 2015/08/01
- Re: How to delete all nil properties from a plist?, Emanuel Berg, 2015/08/01
- Message not available
- Message not available
- Re: How to delete all nil properties from a plist?, Pascal J. Bourguignon, 2015/08/02
- Re: How to delete all nil properties from a plist?, Emanuel Berg, 2015/08/05
- 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, 2015/08/05
- Re: How to delete all nil properties from a plist?, Emanuel Berg, 2015/08/05
- Re: How to delete all nil properties from a plist?, John Mastro, 2015/08/05
- Re: How to delete all nil properties from a plist?, John Mastro, 2015/08/05