Problem
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
Follow up: Could you solve it without converting the integer to a string?
Solution
/**
* @param {number} x
* @return {boolean}
*/
var isPalindrome = function(x) {
let mid = Math.floor(((x+"").length)/2);
let num = x+"";
for(let i = 0; i <mid; i++ ){
if(num[i] != num[num.length - i -1]){
return false;
}
}
return true;
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