Oct 7, 2019 · Mar 25, 2021 · Mar 25, 2021 · Mar 25, 2021
diff --git a/solutions/add_two_numbers.ts b/solutions/add_two_numbers.ts
 import { SinglyLinkedListNode } from '../types/linked_list.ts';

 // 2. Add Two Numbers
 // https://leetcode.com/problems/add-two-numbers/
 export default function addTwoNumbers(nodeA: SinglyLinkedListNode<number>, nodeB: SinglyLinkedListNode<number>) {
  if (!nodeA || !nodeB) return nodeA ?? nodeB ?? null;

  const sum = nodeA.val + nodeB.val;
  const node = { val: sum % 10, next: null };
  node.next = addTwoNumbers(nodeA.next, nodeB.next);

  if (sum >= 10) {
    node.next = addTwoNumbers(node.next, { val: 1, next: null });
  }

  return node;
 }
diff --git a/solutions/add_two_numbers_test.ts b/solutions/add_two_numbers_test.ts
 import { test } from "https://deno.land/std/testing/mod.ts";
 import { assertEquals } from "https://deno.land/std/testing/asserts.ts";
 import { createSinglyLinkedListNode } from '../test_utilities/linked_list.ts';
 import addTwoNumbers from "./add_two_numbers.ts";

 test("2. Add Two Numbers", () => {
  assertEquals(addTwoNumbers(createSinglyLinkedListNode([2,4,3]), createSinglyLinkedListNode([5,6,4])), createSinglyLinkedListNode([7,0,8]));
  assertEquals(addTwoNumbers(createSinglyLinkedListNode([9,9,9]), createSinglyLinkedListNode([1])), createSinglyLinkedListNode([0,0,0,1]));
  assertEquals(addTwoNumbers(createSinglyLinkedListNode([1]), createSinglyLinkedListNode([1])), createSinglyLinkedListNode([2]));
 });