LC 9. Palindrome Number

 1/**
 2 * @param {number} x
 3 * @return {boolean}
 4 */
 5var isPalindrome = function(x) {
 6  if (x < 0 || (!(x % 10) && x)) return false
 7  let x2 = x, res = 0
 8  while(x2) {
 9    res = res * 10 + x2 % 10
10    x2 = ~~(x2 / 10)
11  }
12  return res === x
13};