Optional Parameter Index Route

I'm looking to have an optional parameter on the index route like so:

$app->get('/{name?}', function ($name) {
      //Do Something here
});

I basically want to check and see if there is a parameter supplied. If so return a specific view, if not return the standard index view. For the life of me I can't get it to work, more than likely doing something stupid! Any help would be greatly appreciated!

via Chebli Mohamed