class ListNode { constructor(val, next) { this.val = (val === undefined ? 0 : val); this.next = (next === undefined ? null : next); } } var reverseList = function (head) { // Special case... if (head == null || head.next == null) return head; // Create a new node to call the function recursively and we get the reverse linked list... var res = reverseList(head.next); // Set head node as head.next.next... head.next.next = head; //set head's next to be null... head.next = null; console.log("res") console.log(res) return res; // Return the reverse linked list... }; reverseList(new ListNode(1, new ListNode(2, new ListNode(3, new ListNode(4, new ListNode(5))))))