7. Reverse Integer

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`

var reverse = function(x) {

    let bit = Math.pow(2,31) - 1   

    let rev= x.toString().split('').reverse().join('') 

    let result = parseInt(rev)

    if(result > (bit) || result < -(bit)){
        return 0
    }

    if(x<0){
        return -result
    }else{
        return result
    }
}