Reverse Integer

Description

Given a 32-bit signed integer, reverse digits of an integer.

Example 1:

Input: 123
Output: 321

Example 2:

Input: -123
Output: -321

Example 3:

Input: 120
Output: 21

Note:
Assume we are dealing with an environment which could only store integers within the 32-bit signed integer range: [−2³¹,  2³¹ − 1]. For the purpose of this problem, assume that your function returns 0 when the reversed integer overflows.

Solution(javascript)

/**
 * @param {number} x
 * @return {number}
 */
const reverse = function (x) {
  let max = (2 ** 31) - 1
  let min = - (2 ** 31)
  
  const isMinus = x < 0
  const str = String(Math.abs(x)).split('').reverse().join('')
  const result =  isMinus ? Number(`-${str}`) : Number(str)
  if (result > max || result < min) {
    return 0
  }
  return result
}