Reverse Integer

Description

Given a signed 32-bit integer x, return x with its digits reversed. If reversing x causes the value to go outside the signed 32-bit integer range [-231, 231 - 1], then return 0.

Assume the environment does not allow you to store 64-bit integers (signed or unsigned).

 

Example 1:

Input: x = 123
Output: 321

Example 2:

Input: x = -123
Output: -321

Example 3:

Input: x = 120
Output: 21

 

Constraints:

• -231 <= x <= 231 - 1

Solution(javascript)

/**
 * @param {number} x
 * @return {number}
 */
var reverse = function(x) {
      var reverseX = parseInt(x.toString().split('').reverse().join(''));
    if (reverseX < (Math.pow(2, 31) * -1) || reverseX > Math.pow(2, 31) - 1) return 0;
    return reverseX* Math.sign(x);
};