https://leetcode-cn.com/problems/add-strings/ 数组、字符串

遍历

  1. function addStrings(num1: string, num2: string): string {
  2.     let i = num1.length - 1, j = num2.length - 1, add = 0;
  3.     const ans = [];
  4.     while (i >= 0 || j >= 0 || add != 0) {
  5.         const x = i >= 0 ? +num1[i] : 0;
  6.         const y = j >= 0 ? +num2[j] : 0;
  7.         const result = x + y + add;
  8.         ans.unshift(result % 10);
  9.         add = result > 9 ? 1 : 0;
  10.         i -= 1;
  11.         j -= 1;
  12.     }
  13.     return ans.join('');
  14. };