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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