Add some nil exposition

resources/koans.clj

@@ -4,6 +4,7 @@
                       true
                       false
                       true
+                      true
                       3]}]
 
  ["02_lists" {"__" [1 2 3 4 5
@@ -20,9 +21,8 @@
                  ()]}]
 
  ["03_vectors" {"__" [1
-                   []
                    [1]
-                   [nil]
+                   [nil nil]
                    2
                    [333]
                    :peanut

src/koans/01_equalities.clj

@@ -17,5 +17,8 @@
   "But a looser equality is also possible"
   (= __ (== 2.0 2))
 
+  "Something is not equal to nothing"
+  (= __ (not (= 1 nil)))
+
   "When things cannot be equal, they must be different"
   (not= :fill-in-the-blank __))

src/koans/03_vectors.clj

@@ -1,15 +1,12 @@
 (meditations
-  "You can use vectors in clojure to create an 'Array' like structure"
+  "You can use vectors in clojure as array-like structures"
   (= __ (count [42]))
 
-  "You can create a vector in several ways"
+  "You can create a vector from a list"
-  (= __ (vec nil))
-
-  "And populate it in either of these ways"
   (= __ (vec '(1)))
 
-  "There is another way as well"
+  "Or from some elements"
-  (= __ (vector nil))
+  (= __ (vector nil nil))
 
   "But you can populate it with any number of elements at once"
   (= [1 __] (vec '(1 2)))