Bad example:
(-> "hello world" (.split " ") #^String second (.split "o") seq) ;
actually works
but not:
(-> "hello world" (.split " ") #^String (second) (.split "o") seq) ;
works only with the patched ->
Christophe Grand a écrit :
> Hello,
>
> Currently when you have a reflection warning in a -> form, you have to
> split it:
>
> clojure.core=> (-> "hello world" (.split " ") second (.split "o") seq)
> Reflection warning, line: 1269 - call to split can't be resolved.
> ("w" "rld")
>
> I propose to modify the -> macro to make it preserve type hints, hence
> you could write:
>
> clojure.core=> (-> "hello world" (.split " ") #^String second (.split
> "o") seq)
> ("w" "rld")
>
> Here is the patched macro:
>
> (defmacro ->
> "Threads the expr through the forms. Inserts x as the
> second item in the first form, making a list of it if it is not a
> list already. If there are more forms, inserts the first form as the
> second item in second form, etc."
> ([x] x)
> ([x form] (with-meta
> (if (seq? form)
> `(~(first form) ~x ~@(next form))
> (list form x)) (meta form)))
> ([x form & more] `(-> (-> ~x ~form) ~...@more)))
>
>
--
Professional: http://cgrand.net/ (fr)
On Clojure: http://clj-me.blogspot.com/ (en)
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