reverseInteger.js

// 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 */

/*
 * @param {number} x
 * @return {number}
 */

var reverse = function(x) {
	var maxNum = Math.pow(2,31) - 1;
    var num = x.toString().split("").reverse().join("");

    if(num.indexOf('-') !== -1) {
    	num = '-' + num.replace('-','');
    }
    if(num > maxNum || num < -(maxNum)) {
    	return 0;
    }
    return parseInt(num);
};