adding about sets

koans/about_sets.clj

@@ -0,0 +1,16 @@
+(meditations
+ "Sets are another important data structure in clojure"
+ (= #{} (set nil))
+
+ "Remember that a set is a 'set'"
+ (= __ (set '(1 1 2 2 3 3 4 4 5 5)))
+
+ "You can ask clojure for the union of two sets"
+ (= __ (clojure.set/union #{1 2 3 4} #{2 3 5}))
+
+ "And also the intersection"
+ (= __ (clojure.set/intersection #{1 2 3 4} #{2 3 5}))
+
+ "But don't forget about the difference"
+ (= __ (clojure.set/difference #{1 2 3 4 5} #{2 3 5})))
+

koans/path_to_enlightenment.clj

@@ -14,4 +14,5 @@
 
 (load "about_equalities")
 (load "about_vectors")
+(load "about_sets")
 (println "You have acheived clojure enlightenment. Namaste.")