36 lines
1.0 KiB
Clojure
36 lines
1.0 KiB
Clojure
|
(defn hello
|
||
|
|
([] "Hello World!")
|
||
|
|
([a] (str "Hello, you silly " a "."))
|
||
|
|
([a & more] (str "Hello to this group: "
|
||
|
|
(apply str
|
||
|
|
(interpose ", " (concat (list a) more)))
|
||
|
|
"!")))
|
||
|
|
|
||
|
|
(defmulti diet (fn [x] (:eater x)))
|
||
|
|
(defmethod diet :herbivore [a] __)
|
||
|
|
(defmethod diet :carnivore [a] __)
|
||
|
|
(defmethod diet :default [a] __)
|
||
|
|
|
||
|
|
(meditations
|
||
|
|
"Some functions can be used in different ways - with no arguments"
|
||
|
|
(= __ (hello))
|
||
|
|
|
||
|
|
"With one argument"
|
||
|
|
(= __ (hello "world"))
|
||
|
|
|
||
|
|
"Or with many arguments"
|
||
|
|
(= __
|
||
|
|
(hello "Peter" "Paul" "Mary"))
|
||
|
|
|
||
|
|
"Multimethods allow more complex dispatching"
|
||
|
|
(= "Bambi eats veggies."
|
||
|
|
(diet {:species "deer" :name "Bambi" :age 1 :eater :herbivore}))
|
||
|
|
|
||
|
|
"Different methods are used depending on the dispatch function result"
|
||
|
|
(= "Simba eats animals."
|
||
|
|
(diet {:species "lion" :name "Simba" :age 1 :eater :carnivore}))
|
||
|
|
|
||
|
|
"You may use a default method when no others match"
|
||
|
|
(= "I don't know what Rich Hickey eats."
|
||
|
|
(diet {:name "Rich Hickey"})))
|