I think the main intention of type is to be used as a more generic version
of class, that lets clojure data participate alongside java objects etc
with multi-methods etc.
i.e.
(defmulti foo type)
(defmethod foo java.lang.String [x]
:string-dispatched)
(defmethod foo :my-clojure-type [x]
:my-clojure-type-dispatched)
(foo ^{:type :my-clojure-type} {:blah :blah}) ;; =>
:my-clojure-type-dispatched
derive et al also let you use keywords to augment java class hierarchies
with new types, provide multiple inheritance and priorities with
prefer-method etc.
R.
On Fri, 12 Feb 2016 at 21:37, Alan Thompson <clooj...@gmail.com> wrote:
> Hey - Just saw something on the clojure.core/type function:
>
>
>
> (defn type
> "Returns the :type metadata of x, or its Class if none"
> {:added "1.0"
> :static true}
> [x]
> (or (get (meta x) :type) (class x)))
>
>
> I have never seen this before, and it appears the :type metadata is not
> used in the clojure.core source code itself. Is this ever used for
> anything or is it just a vestigial remnant from long ago?
>
> Alan
>
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