Case only works with ints keywords and some other literals (including
lists, but don't do that, since it doesn't do what you think it does).
While multi-methods work on pretty much anything:
(defmulti first-of-both (fn [a b]
[(first a) (first b)]))
(defmethod first-of-both [1 1]
[a b]
(println "one"))
(defmethod first-of-both [1 2]
[a b]
(println "two"))
(first-of-both [1] [2]) => "two"
(first-of-both [1] [1]) => "one"
Timothy
On Thu, Jul 10, 2014 at 12:44 PM, Daniel Kersten <dkers...@gmail.com> wrote:
> It does work.
>
> As far as I can tell, the namespace with defmethod must require the
> namespace with defmulti and also the namespace with defmethod must be
> required from some other namespace that is being executed.
>
> Eg:
>
> *foo.clj:*
> (ns foo)
> (defmulti mmtest identity)
> (defmethod mmtest :default [_] (println "default"))
>
> *bar.clj:*
> (ns bar
> (:require [foo]))
> (defmethod mmtest :bar [_] (println "in bar"))
>
> *core.clj:*
> (ns core
> (:require [foo :refer [mmtest]] ; The mm we want to call
> [bar])) ; include the :bar impl
>
> (println "Testing")
> (mmtest :bar) ; Prints "in bar"
>
>
> If you don't require bar from core, it will print default instead.
>
> Note, in this example I require foo and bar from core and use mmtest in
> core too - you don't need to require bar from the same namespace that you
> use in from like I did here. You just need to make sure that the (defmethod
> ...) call gets executed before you call mmtest.
>
>
>
> On 10 July 2014 19:09, Elric Erkose <elric.erk...@gmail.com> wrote:
>
>> This sounds interesting. I tried to define a multimethod in one file and
>> a method in another file. I had no success.
>>
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