multimethod.clj

;; Multimethod definition showing that the run 
;; might have multiple informations. The identity
;; function is used as dispatcher function to 
;; determine which implementation of run is to be
;; called
(defmulti run identity)
;; The run method implementation for temp. 
(defmethod run "temp"
    [city day] 
    (get-temp city day))
;; Reads humidity.
(defmethod run "humidity" 
    [city day]
    (get-humidity city day))
;; Reads wind.
(defmethod run "windspeed"
    [city day] 
    (get-windspeed city day))
;; you are encouraged to add more functions.