Clojurians Log v2

https://github.com/ont-app/sparql-endpoint

Here are a few reasons. A) Vanilla multimethods in Clojure either dispatch to a specific method or :default but there's no in-between. You can't do something like

(defmulti describe-animal-location (fn [animal location] (keyword animal) (keyword location)))

(defmethod describe-animal-location [:bird :tree]
  [_ _]
  "Bird in a tree")

;; can't do this
(defmethod describe-animal-location [:default :tree]
  [animal _]
  (str animal " in a tree"))

(m/defmethod describe-animal-location :before :default
  [animal location]
  (println "describe-animal-location called with" animal location)
  location)

(defmethod describe-animal-location [:songbird :tree]
  [animal location]
  (println "A songbird is in a tree.")
  ((get-method describe-animal-location :bird :tree) animal location))

(m/defmethod describe-animal-location [:songbird :tree]
  [animal location]
  (println "A songbird is in a tree.")
  (next-method animal location))

(let [dispatch-fn :type
      multifn     (-> (m/default-multifn dispatch-fn)
                      (m/add-primary-method Object (fn [next-method m]
                                                     :object)))
      multifn'    (m/add-primary-method multifn String (fn [next-method m]
                                                         :string))]
  ((juxt multifn multifn') {:type String}))

;; -> [:object :string]

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Thank you!