check_integer_palindrome.js

// 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 palindromeInt = -758557;
function checkIntegerPalindrome(x) {
    var reverseInt = 0;
    var isNegative = false;
    var originalInt = x;
    if (x < 0) {
        return false;
    }
    while (x > 0) {
        var lastDigit = x % 10;
        reverseInt = (reverseInt * 10) + lastDigit;
        x = Math.floor(x / 10);
    }
    if (isNegative) {
        reverseInt = -1 * reverseInt;
    }
    if (reverseInt === originalInt) {
        return true;
    }
    return false;
}
var isIntegerPalindrome = checkIntegerPalindrome(palindromeInt);
console.log(isIntegerPalindrome);