Cacher is the code snippet organizer for pro developers

(let [nashorn (-> (javax.script.ScriptEngineManager.)
                  (.getEngineByName "nashorn"))]
  (.eval nashorn "print('hello')"))
;; => nil
;; and doesn't print `hello`

(let [nashorn (-> (javax.script.ScriptEngineManager.)
                  (.getEngineByName "nashorn"))]
  (.eval nashorn "var a = 1")
  (.eval nashorn "a + 2"))
;; => 3.0

(let [nashorn (-> (javax.script.ScriptEngineManager.)
                  (.getEngineByName "nashorn"))]
  (.eval nashorn "function plus1(n){ return n + 1; }")
  [(.invokeFunction (cast javax.script.Invocable nashorn) "plus1"
                    (into-array Object [3]))
   (.invokeFunction (cast javax.script.Invocable nashorn) "plus1"
                    (into-array Object ["3"]))])
;; => [4.0 "31"]