Hi,
> I wrote few apps with clojure. I have used many times macro to expand
> expressions and change some control flows. I thought that I know
> macros, but now I know that doing some programming by analogy is not
> enough. In fact I still don't know the macros works, I don't know when
> and how is evaluated and how symbols are evaluated. Problem below is
> something which I'm not able to solve with my current "knowledge".
>
> Let say that I wrote macro map-fnc
>
> and I want to use it like
>
> (map-fnc (function1 [] "hello")
> (function2 [a] (println a)) )
>
> The result is map in which keys are names of methods as strings and
> body is a function with proper arity.
> So I can evalutate this:
>
>
> ((get (map-fnc (function1 [] "hello")
> (function2 [a] (println a)) ) "function1"))
>
> or this
>
>
> ((get (map-fnc (function1 [] "hello")
> (function2 [a] (println a)) ) "function2") "hello world")
>
> Any help?! I belive that solving this problem might give me more
> insight on how macro works.
I might write it like this -
(defmacro map-fnc
[& fn-specs]
(let [fn-names (map (comp str first) fn-specs)
fn-decls (map #(cons 'fn (rest %)) fn-specs)
fn-map (zipmap fn-names fn-decls)]
`~fn-map))
See if that works for you.
Regards,
BG
--
Baishampayan Ghose
b.ghose at gmail.com
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