Encoding Keywords as Strings is a performance optimization in clojurescript.
js/String is in fact extended to IFn to make it work
https://github.com/clojure/clojurescript/blob/master/src/cljs/cljs/core.cljs#L1795
I don't think it is an immutable design choice, but a replacement with
interned Keyword objects would need to stand up against the current
solution, performance wise.
My feeling is that this could be tackled as soon as we have a stategy for
whole program optimization, so that we could intern keywords at compile
time.
2012/11/26 Krukow <karl.kru...@gmail.com>
> Hi,
> I'm writing my first ClojureScript program. I defined a protocol for a
> query language which I wanted to extend to various data types, including
> keywords.
>
> However keywords are strings when it comes to dispatch. Is this a bug, or
> by design?
>
> ClojureScript:cljs.user> (defprotocol Foo (-a [x] "sample"))
> nil
> ClojureScript:cljs.user> (extend-protocol Foo
> Keyword
> (-a [x] (print "keyword")))
> #<
> function (x) {
> return cljs.core.print.call(null, "keyword");
> }
> >
> ClojureScript:cljs.user> (-a :foo)
> "Error evaluating:" (-a :foo) :as "cljs.user._a.call(null,\"\\**
> uFDD0'foo\");\n"
> org.mozilla.javascript.**JavaScriptException: Error: No protocol method
> Foo.-a defined for type string: ?'foo (<cljs repl>#22)
> at <cljs repl>:22 (anonymous)
> at <cljs repl>:14 (_a)
> at <cljs repl>:7 (anonymous)
> at <cljs repl>:7
>
>
> If I extend to js/String it works.
>
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