Return if a number is a palindrome.

function isPalindrome(n) {
    if (n < 0) return false;

let str = String(n);

for (let i = 0; i < str.length / 2; i++) {
        if (str[i] !== str[str.length - 1 - i]) return false;
    }

return true;
}

const x = isPalindrome(111);
const y = isPalindrome(122);
const z = isPalindrome(-121);

console.log(x);
console.log(y);
console.log(z);