Number Zoo Patrol

number-zoo-patrol/index.js

@@ -0,0 +1,10 @@
+// https://www.codewars.com/kata/number-zoo-patrol/train/javascript
+
+function findNumber(arr) {
+  let max = Math.max(...arr);
+  for (let i = 1; i < max; ++i) {
+    if (arr.indexOf(i) < 0) {
+      return i;
+    }
+  }
+}