js Find Longest Palindrome code example

Example 1: js palindrome number

isPalindrome = function(x) {
    if (x < 0) {
        return false;
    }
    
    return x === reversedInteger(x, 0);
};

reversedInteger = function(x, reversed) {
    if(x<=0) return reversed;
        reversed = (reversed * 10) + (x % 10);
        x = Math.floor(x / 10);
    
    return reversedInteger(x, reversed);
};

Example 2: how to solve palindrome problem in javascript

function palindrome(str) {
  return true;
}
palindrome("eye");