The #js tagged literal, like all reader macros (@, ~, ~@, #, etc) are resolved
at read-time, which is before the macro runs and doesn't happen again
afterwards for the macro-expanded code.
Reader forms are for syntactic convenience, so if you have a situation where
you want a JavaScript object with dynamic keys, you need a different construct.
If you know the keys at compile time (like in your macro here) you can use the
(js-obj ...) macro. If you don't know the keys until runtime, you can use
js-obj in cooperation with aset.
On Friday, February 21, 2014 1:07:07 PM UTC-5, Jay Lee wrote:
> I'm building utility macro to convert sequence of functions into javascript
> object in compile time.
>
> What I wanted thing is like as following:
>
> (def-fmap my-funcs
> (test1 [a] (println "t1"))
> (test2 [a] (println "t2")))
>
> --> PLAIN JAVASCRIPT OBJECT
> var my-funcs = {"test1" function (a) { console.log("t1"); }
> "test2" function (b) { console.log("t2"); }}
>
> I tried macro which includes #js data literal but
> it didn't work for me.
>
> (defmacro def-fmap
> [n & body]
> (let [fmap (body->func-maps body)]
> `(def n
> #js ~fmap)
> ))
>
> java.lang.RuntimeException: JavaScript literal must use map or vector notation
>
> So I tried to quote #js literal notation but it was same.
>
> (defmacro def-fmap
> [n & body]
> (let [fmap (body->func-maps body)]
> `(def n
> ~'#js ~fmap)
> ))
>
> I want to optimize performance for my clojuresciprt
> by utilizing macro expansion.
>
> Any tips?
>
> Thanks.
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