Add Two Numbers Represented by Linked Lists

AddTwoNumsLinkedList.js

// https://www.geeksforgeeks.org/add-two-numbers-represented-by-linked-lists-set-3/
// Same - https://www.geeksforgeeks.org/add-two-numbers-represented-by-linked-lists/
function printList(root) {
  let tmp = root;
  let arr = [];
  while (tmp) {
    arr.push(tmp.val);
    tmp = tmp.next;
  }
  return arr;
}
class Node {
  constructor(val, next) {
    this.val = val;
    this.next = next;
  }
}
function getIntFromList(list) {
  const listArr = printList(list);
  return listArr.reduce((acc, num, idx) => {
    return acc + num * Math.pow(10, listArr.length - 1 - idx);
  }, 0);
}
function addNumbers(L1, L2) {
  const intL1 = getIntFromList(L1);
  const intL2 = getIntFromList(L2);
  return intL1 + intL2;
}
// https://www.geeksforgeeks.org/add-two-numbers-represented-by-linked-lists-set-3/
// Same - https://www.geeksforgeeks.org/add-two-numbers-represented-by-linked-lists/
const ex1L1 = new Node(5, new Node(6, new Node(3)));
const ex1L2 = new Node(8, new Node(4, new Node(2)));
console.log(addNumbers(ex1L1, ex1L2) === 1405);

const ex2L1 = new Node(1, new Node(0, new Node(0)));
const ex2L2 = new Node(9, new Node(1));
console.log(addNumbers(ex2L1, ex2L2) === 191);