LeetCode #2 (typescript)

#algorithms #typescript

2. Add Two Numbers

Description

...

Solution


function addTwoNumbers(
  l1: ListNode | null | undefined,
  l2: ListNode | null | undefined
) {
  let result = new ListNode();
  let current = result;
  let carry = 0;
  let sum: number;
  while (l1 || l2) {
    sum = (l1?.val ?? 0) + (l2?.val ?? 0) + carry;
    current.next = new ListNode(sum % 10);
    current = current.next;
    carry = sum > 9 ? 1 : 0;
    l1 = l1?.next;
    l2 = l2?.next;
  }
  if (carry) {
    current.next = new ListNode(carry);
  }
  return result.next;
}