override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
    // BONUS: You'll eventually update this code with the two commented-out lines, below
    // guard let currentViewController = self.viewControllers?[0] as? DetailVC else {return}
    // locationsArray = currentViewController.locationsArray
    if segue.identifier == "ToListVC" {
        let destination = segue.destination as! ListVC
        destination.locationsArray = locationsArray
        destination.currentPage = currentPage
    }
}