Oh, I didn't know that. It makes me wonder, then, why integers were
not implemented as functions of sequential collections: (3
[:a :b :c]).
Ah, well. I guess since let can't be changed, it's then a choice
between using accessors or being more elegant. Thanks for the reply.
On Jun 8, 9:25 am, Konrad Hinsen <konrad.hin...@laposte.net> wrote:
> On Jun 8, 2009, at 17:46, samppi wrote:
>
> > ...I'd love it if the values of symbol keys could be any symbol, not
> > just keywords, so that the key symbol is bound to (val-symbol
> > the-map):
> > (let [{name this-is-a-symbol} person-1] ...) ; name is bound to
> > (this-is-a-symbol person-1)
>
> > It's backwards-compatible. But is this possible? Practical?
>
> I don't think it could made to be backwards-compatible. The
> documentation states:
>
> "Map binding-forms allow you to bind names to parts of associative
> things (not just maps), like maps, vectors, string and arrays (the
> latter three have integer keys)."
>
> The current implementation of destructuring map binding forms uses get:
>
> (destructure '[{name :name} person-1])
> -> [map__268 person-1 name (clojure.core/get map__268 :name)]
>
> This works as advertised with maps, vectors, strings, etc. Your
> proposal would change the expansion to
>
> -> [map__268 person-1 name (:name map__268)]
>
> That works fine if person-1 is a map, but destructuring a vector with
> a map binding form is no longer possible.
>
> Nothing stops you from defining your own let-like macro with your own
> destructuring rules, of course!
>
> Konrad.
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