If you are dispatching on types, use protocols. It's much faster.
Luc P
> I've experienced rewriting my ClojureScript code into multimethods
> base.
> I'd share my results.
>
> Initially I implemented polymorphism behavior as simple hashmap like
> this:
>
> (def parent
> {:foo (fn [x] ...)
> :bar (fn [x] ...)})
> (def child
> (merge parent {:foo (fn [x] ...)}))
>
> For some reason, I didn't choose protocols.
> Then I found multimethods support hierarchy system and rewrote the
> code into 42 defmulti and 64 defmethod.
>
> After rewriting, I noticed that rewritten code is too slow as I can
> see a displaying delay without measurement.
>
> Profiles in Chrome (Ignore first (program) line.)
> Simple hashmap approach: http://twitpic.com/88wvyl
> Multimethods approach: http://twitpic.com/88wwd8
>
> So I put the code back.
>
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