[Leetcode] 9. Palindrome Number (Typescript)

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

 

Solution

function isPalindrome(x: number): boolean {
  const reversedNumber = x.toString().split('').reverse().join('');
  return x.toString() === reversedNumber;
}