7.整数反转

我的回答

function reverse(x: number): number {
  const min = Math.pow(-2, 31);
  const max = Math.pow(2, 31) - 1;
  if (x === 0) return x;
  const sign = x >= 0 ? "+" : "-";
  const s = String(Math.abs(x)).split("").reverse().join("");
  const res = Number(sign + s);
  if (res < min || res > max) return 0;
  return res;
}

其他回答

function reverse(x: number): number {
  let res = 0;
  const min = Math.pow(-2, 31);
  const max = Math.pow(2, 31) - 1;
  while (x) {
    res = res * 10 + (x % 10);
    if (res < min || res > max) return 0;
    x = ~~(x / 10);
  }
  return res;
}