modularized random number generation logic

js/passwordGenerator.js

@@ -1,6 +1,9 @@
 var passwordGenerator = (function() {
-  return {
+  var generateRandomNum = function (max) {
-    generatePassword: function (options) {
+    return Math.floor(Math.random() * max);
+  };
+
+  var generatePassword = function (options) {
     var uppercase = "ABCDEFGHIJKLMNOPQRSTUVWXTZ";
     var lowercase = "abcdefghiklmnopqrstuvwxyz";
     var numbers = "0123456789";
@@ -20,10 +23,13 @@ var passwordGenerator = (function() {
     }
     var result = "";
     for (var i = 0; i < options.passwordLength; i++) {
-        var randomNum = Math.floor(Math.random() * candidates.length);
+      var randomNum = generateRandomNum(candidates.length);
       result += candidates.substring(randomNum, randomNum + 1);
     }
     return result;
-    }
+  };
+
+  return {
+    generatePassword: generatePassword
   };
 })();