problem

https://leetcode.com/problems/reverse-integer/

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

var reverse = function(x) {
    const isNegative = x < 0;
    const min = Math.pow(-2, 31);
    const max = Math.pow(2, 31)-1;

    const str = (Math.abs(x)).toString();
    let result = [...str].reverse().join('');
    if( isNegative ) {
        result = "-" + result;
    }
    const number = parseInt(result);

    if( number >= min && number <= max )
        return number;
    else
        return 0;
};