ARTS第二周

/**
 * Definition for singly-linked list.
 * function ListNode(val) {
 *     this.val = val;
 *     this.next = null;
 * }
 */
/**
 * @param {ListNode} l1
 * @param {ListNode} l2
 * @return {ListNode}
 */
let addTwoNumbers = function(l1, l2) {
    let result;
    let currentNode;
    let temp = 0;
    do {
        if (!result) result = currentNode = new ListNode(0);
        else currentNode = currentNode.next = new ListNode(0);
        temp = (l1?l1.val:0) + (l2?l2.val:0) + temp;
        currentNode.val = temp % 10;
        temp = (temp - temp % 10) / 10;
        l1 = l1 && l1.next;
        l2 = l2 && l2.next;
    } while(l1 || l2 || temp);
    return result;
};