Hi,

On 2 Sep., 06:26, HB <hubaghd...@gmail.com> wrote:

> How a multimethod in Clojure differs from a method that have multiple
> bodies?

The latter can only dispatch based on the number of arguments and
cannot be extended later on. Compare:

(defmulti foo-multi type)

(defmethod foo-multi String
   ...)

(defmethod foo-multi Integer
   ...)

(defmethod foo-multi some.other.Bar
  ...)

Compare this to:

(defn foo-fn
  [x]
  (condp #(isa? %2 %1) (type x)
    String ...
    Integer ...
    some.other.Bar ...))

foo-fn cannot be extended after it is defined, while I can still say
later on:

(defmethod foo-multi ::MyType
  ...)

Hope that helps.

Sincerely
Meikel

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