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bug#23736: Add companion to apply-partially
From: |
Lars Ingebrigtsen |
Subject: |
bug#23736: Add companion to apply-partially |
Date: |
Sun, 28 Jul 2019 14:05:55 +0200 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/27.0.50 (gnu/linux) |
Rasmus <rasmus@gmx.us> writes:
> Could we add an ‘apply-rpartially’ or ‘apply-partially-last’ to subr.el?
> Like ‘apply-partially’, but fixing the last arguments. This is useful for
> e.g. ‘set-face-attribute’ where one might a common :inherits to many
> faces, e.g.
>
> (mapc (apply-rpartially ’set-face-attribute :inherit ’fixed-pitch) ’(list
> of faces))
>
> I have used this in my init.el,
>
> (defun apply-rpartially (fun &rest args)
> "Return a function that is a partial application of FUN to ARGS.
> ARGS is a list of the last N arguments to pass to FUN. The
> result is a new function which does the same as FUN, except that
> the last N arguments are fixed at the values with which this
> function was called."
> (lambda (&rest args1)
> (apply fun (append args1 args))))
(I'm going through old Emacs bug reports that haven't received any
response.)
I think this sounds like a slightly too obscure function to add to Emacs
core. apply-partially is more useful because functions are often
constructed in ways that makes that a convenient function, while the
opposite order is more unusual, I think?
(And especially with lexical support doing this sort of thing is often
easier, anyway.)
So I'm closing this as a "wontfix".
--
(domestic pets only, the antidote for overdose, milk.)
bloggy blog: http://lars.ingebrigtsen.no
- bug#23736: Add companion to apply-partially,
Lars Ingebrigtsen <=