adventures-in-clojure.clj

(defn update-world [world room action]
  ;; if action is something like pick up an object from the room 
  ;; I will return a new world without such object in the room,
  ;; if, otherwise, you are moving between some room I will return the same
  ;; world but you will obviously change the room
  )

(loop [world {:roomA {} :roomB {}
       room :roomA]
  (let [[new-world next-room] (update-world world room (get-input))
    (recur new-world next-room)))