addList function in Angular task list

controllers-3.js

$scope.addList = function() {
  var newList = $scope.newList.trim();

  if (!newList.length) {
    return;
  }

  lists.push({
    listId: Slug.slugify(newList + '-' + lists.length),
    title: newList,
    tasks: [],
    remainingCount: 0
  });

  $scope.newList = '';
  $scope.currentList = lists[lists.length - 1];
  $scope.setTasks();
}