LinkedList From Last

fromLast.js

/*
Given a linked list and integer n, return the element n spaces from the last node in the list. 
  - Do not call the 'size' method of the linked list
  - Assume that n will always be less than the length of the list.
*/

function fromLast(list, n) {
    let slow = list.getFirst();
    let fast = list.getAt(n);
    
    while (fast.next) {
        slow = slow.next;
        fast = fast.next;
    }
    
    return slow;
}