bound Forms script to limit responses

Code.gs

// To create a bound script, open a Google Sheets, Docs, or Forms file, then select Tools > Script editor.
// Steps to make this function run on form submit:
// https://developers.google.com/apps-script/guides/triggers/installable#managing_triggers_manually
function lockOnFull(e) {
  // Get the form to which this script is bound.
  var form = FormApp.getActiveForm();
  var formResponses = form.getResponses();
  // room has 11 seats. Limit to 11 responses.
  if ( formResponses.length > 10 ) {
    form.setAcceptingResponses(false);
   }
}