* Add a filter function to emacs
@ 2010-07-07 19:45 Rolando Pereira
2010-07-08 6:36 ` Geoff Gole
2010-07-08 9:12 ` Deniz Dogan
0 siblings, 2 replies; 3+ messages in thread
From: Rolando Pereira @ 2010-07-07 19:45 UTC (permalink / raw)
To: emacs-devel
Hello,
I would like to know if there is a reason for the lack of a filter
function on the emacs code base.
According to the Elisp Cookbook on the Emacs Wiki, it seems that it
would be simple to implement:
(defun my-filter (condp lst)
(delq nil
(mapcar (lambda (x) (and (funcall condp x) x)) lst)))
;; From http://www.emacswiki.org/emacs/ElispCookbook
Shouldn't this function be in the regular emacs code base (maybe in the
lisp/simple.el file)?
Is there any problem with it?
^ permalink raw reply [flat|nested] 3+ messages in thread* Re: Add a filter function to emacs 2010-07-07 19:45 Add a filter function to emacs Rolando Pereira @ 2010-07-08 6:36 ` Geoff Gole 2010-07-08 9:12 ` Deniz Dogan 1 sibling, 0 replies; 3+ messages in thread From: Geoff Gole @ 2010-07-08 6:36 UTC (permalink / raw) To: Rolando Pereira; +Cc: emacs-devel > > I would like to know if there is a reason for the lack of a filter > function on the emacs code base. > See remove-if and remove-if-not in cl.el. ^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: Add a filter function to emacs 2010-07-07 19:45 Add a filter function to emacs Rolando Pereira 2010-07-08 6:36 ` Geoff Gole @ 2010-07-08 9:12 ` Deniz Dogan 1 sibling, 0 replies; 3+ messages in thread From: Deniz Dogan @ 2010-07-08 9:12 UTC (permalink / raw) To: Rolando Pereira; +Cc: emacs-devel 2010/7/7 Rolando Pereira <ei08150@fe.up.pt>: > Hello, > > I would like to know if there is a reason for the lack of a filter > function on the emacs code base. > > According to the Elisp Cookbook on the Emacs Wiki, it seems that it > would be simple to implement: > > (defun my-filter (condp lst) > (delq nil > (mapcar (lambda (x) (and (funcall condp x) x)) lst))) > ;; From http://www.emacswiki.org/emacs/ElispCookbook > > Shouldn't this function be in the regular emacs code base (maybe in the > lisp/simple.el file)? > > Is there any problem with it? > > I brought this up some time ago as I found that many higher-order functions were missing in (non-cl.el) Emacs. If I remember correctly, it's the lack of lexical scoping that makes it difficult. -- Deniz Dogan ^ permalink raw reply [flat|nested] 3+ messages in thread
end of thread, other threads:[~2010-07-08 9:12 UTC | newest] Thread overview: 3+ messages (download: mbox.gz follow: Atom feed -- links below jump to the message on this page -- 2010-07-07 19:45 Add a filter function to emacs Rolando Pereira 2010-07-08 6:36 ` Geoff Gole 2010-07-08 9:12 ` Deniz Dogan
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