Merge pull request #98 from wakidurrahman/feat/feat/code-challenges-008

update

Author: wakidurrahman

src/code-challenges/code-challenges-002-010.js

@@ -180,3 +180,16 @@ exports.iterative = function (array) {
 
   return result;
 };
+
+/**
+ * Q008: String Rotation
+ * Problem: Find out if a string is a rotation of another string.
+ * E.g. 'ABCD' is a rotation of 'BCDA' but not 'ACBD'
+ */
+
+// First make sure 'a' and 'b' are of the same length.
+// Then check to see if 'b' is a substring of 'a' concatenated with 'a'
+
+module.exports = function (a, b) {
+  return a.length === b.length && (a + a).indexOf(b) > -1;
+};