Add datatypes.

src/koans/datatypes.clj

@@ -0,0 +1,45 @@
+(defrecord Nobel [prize])
+(deftype Pulitzer [prize])
+
+(defprotocol Award
+  (present [this recipient]))
+
+(defrecord Oscar [category]
+  Award
+  (present [this recipient]
+    (print (str "Congratulations on your "
+                (:category this) " Oscar, "
+                recipient
+                "!"))))
+
+(deftype Razzie [category]
+  Award
+  (present [this recipient]
+    __))
+
+(meditations
+  "Holding records is meaningful only when the record is worthy of you"
+  (= __ (.prize (Nobel. "peace")))
+
+  "Types are quite similar"
+  (= __ (.prize (Pulitzer. "literature")))
+
+  "Records may be treated like maps"
+  (= __ (:prize (Nobel. "physics")))
+
+  "While types may not"
+  (= __ (:prize (Pulitzer. "poetry")))
+
+  "Further study reveals why"
+  (= __
+     (map map? [(Nobel. "chemistry")
+                (Pulitzer. "music")]))
+
+  "Either sort of datatype can define methods in a protocol"
+  (= __
+     (with-out-str (present (Oscar. "Best Picture") "Evil Alien Conquerors")))
+
+  "Surely we can implement our own by now"
+  (= "You're really the Worst Picture, Final Destination 5... sorry."
+     (with-out-str (present (Razzie. "Worst Picture") "Final Destination 5"))))
+

src/path_to_answer_sheet.clj

@@ -143,6 +143,17 @@
                       ''(+ 9 1)
                       ''(* 10 2)
                       ''(+ 10 (2 * 3))]}
+      "datatypes" {"__" ['(print
+                            (str "You're really the "
+                                 (.category this)
+                                 ", " recipient "... sorry."))
+                         "peace"
+                         "literature"
+                         "physics"
+                         nil
+                         [true false]
+                         "Congratulations on your Best Picture Oscar, Evil Alien Conquerors!"
+                         ]}
    })
 
 (defn replace-with [s k replacements]

src/path_to_enlightenment.clj

@@ -34,7 +34,8 @@
       "recursion"
       "destructuring"
       "refs"
-      "macros"])
+      "macros"
+      "datatypes"])
 
 (defn require-version [[required-major required-minor]]
   (let [{:keys [major minor]} *clojure-version*]