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Re: Replacement for `aput' from obsolete assoc.el?

From: Stephen J. Turnbull
Subject: Re: Replacement for `aput' from obsolete assoc.el?
Date: Sun, 10 Jun 2012 21:53:18 +0900

Vitalie Spinu writes:

 > There is no way to associate multiple values at once. What is the
 > canonical way to do that?

I don't see such a great need for it.  The loop idiom you propose is
fine (except that I suppose in GNU Emacs you need to use `cl-loop', at
least in core).  In XEmacs, the canonical destructive idiom is

    (setq plist (canonicalize-lax-plist (nconc plist-new plist)))

which gives preference to entries in plist-new, and would be more
efficient (all of the functions are primitives implemented in C).

 > I find reasonable that this sort of functionality be in the core for all
 > available containers.

Reasonable, in some sense, yes.  That probably would pass in Common
Lisp, but as you're probably aware Emacs Lisp prefers simplicity over
generality for generality's sake.

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