Initial data commit

Task/Hailstone-sequence/JavaScript/hailstone-sequence-2.js

@@ -0,0 +1,20 @@
+(function () {
+
+  // Hailstone Sequence
+  // n -> [n]
+  function hailstone(n) {
+    return n === 1 ? [1] : (
+      [n].concat(
+        hailstone(n % 2 ? n * 3 + 1 : n / 2)
+      )
+    )
+  }
+
+  var lstCollatz27 = hailstone(27);
+
+  return {
+    length: lstCollatz27.length,
+    sequence: lstCollatz27
+  };
+
+})();