Comment more validateAnswer method. Also fix the new StringParser bas…

…ed logic to parse the right vaidationParameter-items, but only if they are strings (to prevent JS errors) - #7

src/lib/validation.js

@@ -47,20 +47,32 @@ var validateAnswer = (value, validationItem, questionAnswers) => {
   }
 
   /*
-   * Run the value string through the stringParser with the
+   * Clone the validation parameters so it doesn't effect the
+   * parameters elsewhere by reference.
+   */
+  var validationParameters = (validationItem.params || []).slice(0);
+
+  /*
+   * Run the parameters through the stringParser with the
    * questionAnswers so that it sets the questionAnswer
-   * as the value.
+   * as the parameter.
    */
-  value = StringParser(value, questionAnswers);
+  validationParameters = validationParameters.map(p => {
+    return typeof p === 'string'
+             ? StringParser(p, questionAnswers)
+             : p;
+  });
 
   /*
-   * Clone the validation parameters so it doesn't effect the
-   * parameters by reference. Then push the value to the first
-   * parameter.
+   * Push the value of the question we're validating to
+   * the first parameter of the validationParameters
    */
-  var validationParameters = (validationItem.params || []).slice(0);
   validationParameters.unshift(value);
 
+  /*
+   * Return the result of the validation method running
+   * wtih the validationParameters.
+   */
   return validationMethod.apply(null, validationParameters);
 };