not sure why, but this works:
user=> (.containsKey ^clojure.lang.Associative {:one 1} :one)
true
2012/3/3 Alf Kristian Støyle <alf.krist...@gmail.com>
> Hi guys, I am wondering why this does not work:
>
> (.containsKey {:one 1} :one)
> ;=> ClassCastException clojure.lang.PersistentArrayMap cannot be cast to
> clojure.lang.PersistentHashMap
>
> The map is a:
>
> (class {:one 1})
> ;=> clojure.lang.PersistentArrayMap
>
> And a PersistentArrayMap does have a containsKey method (
> https://github.com/clojure/clojure/blob/master/src/jvm/clojure/lang/PersistentArrayMap.java#L95
> ).
>
> I can even find the method:
>
> (filter #(= "containsKey" (.getName %)) (.getMethods (class {:one 1})))
> ;=> (#<Method public boolean
> clojure.lang.PersistentArrayMap.containsKey(java.lang.Object)>)
>
> Should this not be a normal reflective method lookup, why do I get a
> ClassCastException?
>
> It does work if the map gets big enough:
>
> (.containsKey {1 1, 2 2, 3 3, 4 4, 5 5, 6 6, 7 7, 8 8, 9 9} 1)
> ;=> true
>
> But at this point its a different collection:
>
> (class {1 1 2 2 3 3 4 4 5 5 6 6 7 7 8 8 9 9})
> ;=> clojure.lang.PersistentHashMap
>
> Cheers,
> Alf
>
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