Reset a Google Form's Sheet and Responses

resetForm.gs

function resetForm() {
  deleteAllFormResponses()
  resetFormResponseDestination()
}

function resetFormResponseDestination() {
  var form = FormApp.getActiveForm();
  var formResponsesSheetId = form.getDestinationId();
  var spreadsheet = SpreadsheetApp.openById(formResponsesSheetId);
  
  var newSheetId = spreadsheet.getId();
  form.setDestination(FormApp.DestinationType.SPREADSHEET, newSheetId);

  var sheet = spreadsheet.getSheets().pop();
  if (sheet) {
    spreadsheet.deleteSheet(sheet);
  }
}

function deleteAllFormResponses() {
  var form = FormApp.getActiveForm();
  var formResponses = form.getResponses();
  formResponses.forEach(function(response) {
    form.deleteResponse(response.getId());
  });
}