From: Eli Zaretskii <eliz@gnu.org>
To: Michael Heerdegen <michael_heerdegen@web.de>
Cc: 17623@debbugs.gnu.org
Subject: bug#17623: 24.4.50; incorrect example for `apply-partially' in (elisp) `Calling Functions'
Date: Sat, 28 Jun 2014 21:45:22 +0300 [thread overview]
Message-ID: <83tx746fgd.fsf@gnu.org> (raw)
In-Reply-To: <87pphsor8h.fsf@web.de>
> From: Michael Heerdegen <michael_heerdegen@web.de>
> Cc: 17623@debbugs.gnu.org
> Date: Sat, 28 Jun 2014 19:53:34 +0200
>
> There's nothing wrong per see in the current text, but it sounds as if
> `apply-partially` would somehow analyze the argument list of its first
> argument.
Where does it say that? It says the result is a new function that
will call the original with all the arguments combined. There's
nothing about analysis in that text.
> Say that
>
> (apply-partially f arg_1 ... arg_n)
>
> is equivalent to
>
> (lambda (&rest args) (apply f arg_1 ... arg_n args))
Sorry, I don't see how this is an improvement.
Accidentally, the current text is a bit different from what you cited:
-- Function: apply-partially func &rest args
This function returns a new function which, when called, will call
FUNC with the list of arguments composed from ARGS and additional
arguments specified at the time of the call. If FUNC accepts N
arguments, then a call to `apply-partially' with `M < N' arguments
will produce a new function of `N - M' arguments.
> And I think that the paragraph about `apply-partially` should be merged
> into the later text talking about functionals, because the main use case
> of `apply-partially` is to construct anonymous functions for usage as
> argument to some other function.
If you mean this:
It is common for Lisp functions to accept functions as arguments or
find them in data structures (especially in hook variables and property
lists) and call them using `funcall' or `apply'. Functions that accept
function arguments are often called "functionals".
Sometimes, when you call a functional, it is useful to supply a no-op
function as the argument. Here are two different kinds of no-op
function:
then it directly follows the part we were talking about.
next prev parent reply other threads:[~2014-06-28 18:45 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-05-28 23:53 bug#17623: 24.4.50; incorrect example for `apply-partially' in (elisp) `Calling Functions' Drew Adams
2014-06-27 18:41 ` Michael Heerdegen
2014-06-28 1:36 ` Drew Adams
2014-06-28 15:53 ` Michael Heerdegen
2014-06-28 16:55 ` Eli Zaretskii
2014-06-28 17:53 ` Michael Heerdegen
2014-06-28 18:45 ` Eli Zaretskii [this message]
2014-06-28 19:37 ` Michael Heerdegen
2014-06-29 14:57 ` Eli Zaretskii
2021-10-23 5:24 ` Stefan Kangas
2021-10-23 9:44 ` Michael Heerdegen
2021-10-23 11:05 ` Stefan Kangas
2021-10-23 11:58 ` Michael Heerdegen
2021-10-23 11:39 ` Eli Zaretskii
2021-10-23 12:44 ` Michael Heerdegen
2021-10-23 13:13 ` Eli Zaretskii
2021-10-23 15:29 ` Michael Heerdegen
2021-10-23 17:01 ` Stefan Kangas
2021-10-26 9:26 ` Michael Heerdegen
2021-10-26 20:24 ` Stefan Kangas
2021-10-27 9:18 ` Michael Heerdegen
2021-10-29 4:02 ` Richard Stallman
2021-10-29 10:00 ` Michael Heerdegen
2021-10-23 17:54 ` Eli Zaretskii
2021-10-23 13:14 ` Stefan Kangas
2021-10-23 15:38 ` Michael Heerdegen
2021-10-23 17:57 ` Eli Zaretskii
[not found] ` <<83tx746fgd.fsf@gnu.org>
2014-06-28 19:32 ` Drew Adams
2014-06-29 21:46 ` Stefan Monnier
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