Palindrome Number

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 palindrome while 123 is not.

Example 1:

Input: x = 121
Output: true

First Try

the same as Reverse Interger, use number.toString().split(‘’).reverse().join(‘’)

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/**
 * @param {number} x
 * @return {boolean}
 */
var isPalindrome = function(x) {
    if (x<0){
        return false;
    }else{
        let oriString = x.toString();
        let revString = oriString.split('').reverse().join('');
        if (oriString == revString){
            return true;
        }else{
            return false;
        }
    }
    
};

Runtime: 208 ms, faster than 35.50% of JavaScript online submissions for Palindrome Number.
Memory Usage: 48.4 MB, less than 47.41% of JavaScript online submissions for Palindrome Number.

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