https://leetcode.com/problems/palindrome-number/

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/**
 * @param {number} x
 * @return {boolean}
 */
var isPalindrome = function(x) {
    let s = '' + x;
    let res = true,
        l = 0,
        r = s.length - 1;
    while (l < r) {
        if (s[l] !== s[r]) {
            res = false;
            break;
        }
        l++;
        r--;
    }
    return res;
};