7 Reverse digits of an integer Leetcode Problem Javascript Solution

7. Reverse Integer

Problem:

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.

Reverse digits of an integer in Javascript

Solution

var reverse = function(x) {
  let result = 0
  while (x) {
    result = result * 10 + x % 10
    x = x / 10 | 0
  }
  return Math.abs(result) > 2147483647 ? 0 : result
};

Input Example

console.log(reverse(-1254))

Output

-4521

Run the code here: https://repl.it/@VinitKhandelwal/reverse-integer-javascript