[LeetCode/JavaScript] 7. Reverse Integer (medium)

 

문제 

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.

Assume the environment does not allow you to store 64-bit integers (signed or unsigned).

 

 

입출력

Example 1:

Input: x = 123 Output: 321

 

Example 2:

Input: x = -123 Output: -321

 

Example 3:

Input: x = 120 Output: 21

 

Example 4:

Input: x = 0 Output: 0

 

 

제약

Constraints:

• -2^31 <= x <= 2^31 - 1

 

 

코드

var reverse = function(x) {
    if(x>0) {
        x = reverseStr(x);
    }
    else if(x<0) {
        x = reverseStr(Math.abs(x));
        x = -x;
    }
    
    if(x<Math.pow(-2, 31) || x>Math.pow(2, 31)-1) return 0
    
    return x;
};

function reverseStr(num) {
    return num.toString().split("").reverse().join().replaceAll(',', '');
}