#7 - Reverse Integer

Easy • View on LeetCode • View on GitHub

Problem 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 [-2^31, 2^31 - 1], then return 0.

Solution

/**
 * @param {number} x
 * @return {number}
 */
var reverse = function(x) {
  const reversed = String(Math.abs(x)).split('').reverse().join('');

  if (reversed > Math.pow(2, 31)) {
    return 0;
  }

  return reversed * Math.sign(x);
};