Palindrome Number
Description
Given an integer x
, return true
if x
is palindrome integer.
An integer is a palindrome when it reads the same backward as forward.
- For example,
121
is a palindrome while123
is not.
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(javascript)
/**
* @param {number} x
* @return {boolean}
*/
var isPalindrome = function(x) {
let reversedX = '';
x = x.toString()
for(let i = 0; i < x.length; i++) {
reversedX = x[i] + reversedX
}
if (reversedX === x) {
return true
} else {
return false
}
};