Chain map keys macro. This enables you to navigate hierarchically inside the a map of maps (imbricated maps) using string keys as if you'd used keywords.

chain-map-keys.clj

(ns chain-map-keys.core)

(def mymap {"key1" {"key2" {"key3" "value3"}}})
;(--> mymap "key1" "key2" "key3")
;; =>
;(-> (mymap "javahome") (get "key2") (get "key3"))

(defmacro --> [m firstkey & keys]
  (let [a (map #(list 'get %) keys)]
    `(-> (~m ~firstkey) ~@a)))

;; test expansion
(macroexpand-1 '(--> mymap "key1" "key2" "key3"))

(--> mymap "key1" "key2" "key3")
;; => "value3"