js两数求和

getSum.js

const sum = (a, b) => {
  if (a == 0) return b;
  if (b == 0) return a;
  let newA = a ^ b;
  let newB = (a & b) << 1;
  return sum(newA, newB);
}
const a = 10, b = 5;
console.log(sum(a, b)); // 15