20nov22Palindrome.js

Given an integer x, return true if x is a
palindrome
, and false otherwise.

 

Example 1:

Input: x = 121
Output: true
Explanation: 121 reads as 121 from left to right and from right to left.

Example 2:

Input: x = -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: x = 10
Output: false
Explanation: Reads 01 from right to left. Therefore it is not a palindrome.

 

Constraints:

    -231 <= x <= 231 - 1

 /**
 * @param {number} x
 * @return {boolean}
 */
var isPalindrome = function(x) {
    //x is int. 
    //return bool if x reads the same reverse
    // x = 121. x.reverse === 121 => true
    // x = -88. x.reverse === 88- -> false
    //convert the int to string, then compare
    return (String(x) === String(x).split('').reverse().join(''))
};

 Follow up: Could you solve it without converting the integer to a string?