be test 1 - asynchronous stuff

const userIds: Array<integer> = [1, 2, 8, 19];

const deleteUser = (userId: integer): void => {
  //some asynchronous database query
};

const deleteUsers (userIds: Array<integer>): void => {
    console.log('Start deleting users');
    //delete all users
    // a) one by one
    // b) no order required
    console.log('All users have been deleted!');
};

deleteUsers(userIds);