quiz init commit

utils/generateCode.js

@@ -0,0 +1,16 @@
+/**
+ * Generate random code with given length
+ * @param {Number} length code length
+ * @returns {String} Generated code
+ * @example
+ * generateCode(6)
+ */
+module.exports = function generateCode(length) {
+  var result = '';
+  var characters = '0123456789';
+  var charactersLength = characters.length;
+  for (var i = 0; i < length; i++) {
+    result += characters.charAt(Math.floor(Math.random() * charactersLength));
+  }
+  return result;
+};