13장

p.390

;; ClojureScript r1835 src/cljs/cljs/core.cljs line 492
(extend-type nil
  ICounted
  (-count [_] 0))

p.391 (예제 13.1)

(extend-type goog.structs.LinkedMap
  cljs.core/ICounted
  (-count [m] (.getCount m)))

p.393

(defproject joy/music "1.0.0"
     :dependencies [[org.clojure/clojure "1.8.0"]
                      [org.clojure/clojurescript "1.7.228"]])

p.396 (예제 13.4)

(defproject joy/music "1.0.0"
  :dependencies [[org.clojure/clojure "1.8.0"]
                   [org.clojure/clojurescript "1.7.228"]]
  :plugins [[lein-cljsbuild "1.1.3"]]