Reverse LinkedList (Recursion)

let reverseLinkedList = function(root, reverse = new ListNode(0)) {
    if (root) {
        let toAdd = root;
        let next = root.next;

        let reversedNext = reverse.next;
        toAdd.next = reversedNext;
        reverse.next = toAdd;

        reverseLinkedList(next, reverse);
    }
    return reverse.next;
}