->foo is new in 1.3. I'm surprised so many people are recommending it
without mentioning that. ->foo is like foo., except that it's a real
clojure function and as such can be passed as a function; you can call
apply on it; and so forth.
On Oct 6, 11:05 am, Razvan Rotaru <razvan.rot...@gmail.com> wrote:
> This is what I'm looking for. Thanks. I have not seen this kind of
> expression before: ->foo. Is is created by defrecord or is it
> implemented at reader level?
>
> I realize now that I can also keep a generating function in the
> variable stuff:
>
> (let [stuff #(car. %1 %2)]
> (stuff 1982 "Mercedes")
> (stuff 2011 "Seat"))
>
> But keeping the actual "constructor" is of course better.
>
> RR
>
> On Oct 6, 8:56 pm, Meikel Brandmeyer <m...@kotka.de> wrote:
>
>
>
>
>
>
>
> > Hi,
>
> > use the factory function.
>
> > Clojure 1.3.0
> > user=> (defrecord car [year manufacturer])
> > user.car
> > user=> (defn create [stuff] (stuff 1982 "Mercedes Benz"))
> > #'user/create
> > user=> (create ->car)
> > #user.car{:year 1982, :manufacturer "Mercedes Benz"}
>
> > You can't pass car. around at runtime because it is a class. And
> > instantiating a class is hard-wired in the byte code. Hence the actual
> > class must be known at compile time. ->car however is a normal clojure
> > function. So you can pass it around as you like.
>
> > Sincerely
> > Meikel
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