new files

Task/Bulls-and-cows/Clojure/bulls-and-cows.clj

@@ -0,0 +1,38 @@
+(ns bulls-and-cows)
+
+(defn bulls [guess solution]
+  (count (filter true? (map = guess solution))))
+
+(defn cows [guess solution]
+  (-
+   (count (filter (set solution) guess))
+   (bulls guess solution)))
+
+(defn valid-input?
+  "checks whether the string is a 4 digit number with unique digits"
+  [user-input]
+  (if (re-seq #"^(?!.*(\d).*\1)\d{4}$" user-input)
+    true
+    false))
+
+(defn enter-guess []
+  "Let the user enter a guess. Verify the input. Repeat until valid.
+returns a list of digits enters by the user (# # # #)"
+    (println "Enter your guess: ")
+    (let [guess (read-line)]
+      (if (valid-input? guess)
+        (map #(Character/digit % 10) guess)
+        (recur))))
+
+(defn bulls-and-cows []
+  "generate a random 4 digit number from the list of (1 ... 9): no repeating digits
+player tries to guess the number with bull and cows rules gameplay"
+  (let [solution ( take 4 (shuffle (range 1 10)))]
+    (println "lets play some bulls and cows!")
+    (loop [guess (enter-guess)]
+      (println (bulls guess solution) " bulls and " (cows guess solution) " cows.")
+      (if (not= guess solution)
+        (recur (enter-guess))
+        (println "You have won!")))))
+
+(bulls-and-cows)