Re: Adding many elements to a list

[pjb@anevia.com (Pascal J. Bourguignon)]

David Kastrup <dak@gnu.org> writes:

> pjb@anevia.com (Pascal J. Bourguignon) writes:
>
>> David Kastrup <dak@gnu.org> writes:
>>
>>> pjb@informatimago.com (Pascal J. Bourguignon) writes:
>>>
>>>> So better use (require 'cl) (push new-item list)
>>>>    or (cons new-item list)
>>>>    or (append (list new-items...) list)
>>>
>>> (require 'cl) is quite unnecessary for all of the mentioned
>>> alternatives.
>>
>> Not on emacs version < 23.
>
> Nonsense.  push&pop were officially announced in Emacs 21.1.  I may be
> mistaken, but I think they have been there even earlier.
>
> And the other options certainly were there from the earliest versions of
> GNU Emacs.


C-h f push RET
push is a Lisp macro in `cl.el'.
(push x place)

Insert x at the head of the list stored in place.
Analogous to (setf place (cons x place)), though more careful about
evaluating each argument only once and in the right order.  place may
be a symbol, or any generalized variable allowed by `setf'.

[back]

M-x emacs-version RET
GNU Emacs 22.2.1 (x86_64-unknown-linux-gnu, X toolkit) of 2008-08-21 on simias


-- 
__Pascal Bourguignon__