add-two-nums.ts

class ListNode {
  constructor(val = 0, next = null) {
    this.value = val;
    this.next = next;
  }
}

let listA = new ListNode(2, new ListNode(4, new ListNode(3)));

let listB = new ListNode(5, new ListNode(6, new ListNode(4)));

function addTwoNumbers(la, lb) {
  let sum = 0;
  let head = new ListNode();
  let res = head;
  while (la || lb) {
    if (la) {
      sum += la.value;
      la = la.next;
    }
    if (lb) {
      sum += lb.value;
      lb = lb.next;
    }
    let resVal = sum % 10
    res.value = resVal;
    sum = sum > 9 ? 1 : 0;
    if (la || lb) {
      let next = new ListNode();
      res.next = next;
      res = next
    }
  }
  // console.log(printList(head))
  // console.log(sum, res.value)
  if (sum) {
    // let resVal = sum % 10;
    res.next = new ListNode(sum);
    // res.value = resVal;
    // sum = 0;
  }
  return head;
}

function printList(list) {
  let vals = [];
  while (list) {
    if (list) {
      vals.push(list.value);
      list = list.next;
    }
  }
  return vals;
}

console.log(printList(addTwoNumbers(listA, listB)));

let listC = new ListNode(9, new ListNode(9, new ListNode(9, new ListNode(9, new ListNode(9, new ListNode(9, new ListNode(9)))))));
let listD = new ListNode(9, new ListNode(9, new ListNode(9, new ListNode(9))));

console.log(printList(addTwoNumbers(listC, listD)));

let listE = new ListNode(0);
let listF = new ListNode(0);

console.log(printList(addTwoNumbers(listE, listF)))

//[1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1]
//[6,6,4,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1]