9.js

/*
9. Palindrome Number

Determine whether an integer is a palindrome. An integer is a palindrome when it reads the same backward as forward.

Example 1:

Input: 121
Output: true


Example 2:

Input: -121
Output: false
Explanation: From left to right, it reads -121. From right to left, it becomes 121-. Therefore it is not a palindrome.


Example 3:

Input: 10
Output: false
Explanation: Reads 01 from right to left. Therefore it is not a palindrome.
Follow up:

Coud you solve it without converting the integer to a string?
*/

/**
 * @param {number} x
 * @return {boolean}
 */
var isPalindrome = function(x) {
  const s = x.toString().split('');
  const len = s.length;
  for (let i = 0; i < len / 2; ++i) {
    if (s[i] !== s[len - 1 - i]) return false;
  }

  return true;
};

console.log(isPalindrome(121));
console.log(isPalindrome(-121));
console.log(isPalindrome(10));