How to dispatch a multimethod on the type of an array

问题

I'm working on a multimethod that needs to update a hash for a bunch of different things in a sequence. Looked fairly straitforward until I tried to enter the 'type of an array of X'.

(defmulti update-hash #(class %2))

(type (byte 1))
=> java.lang.Byte
(defmethod update-hash java.lang.Byte [md byte]
  (. md update byte))

(type (into-array  [ (byte 1)]))
=> [Ljava.lang.Byte;
(defmethod update-hash < WHAT GOES HERE > [md byte]

回答1:

Either of these should work:

(defmethod update-hash (Class/forName "[Ljava.lang.Byte;") [md byte] ...)

(defmethod update-hash (class (make-array Byte 0)) [md byte] ... )

来源：https://stackoverflow.com/questions/2782901/how-to-dispatch-a-multimethod-on-the-type-of-an-array