Is Palindrome Problem in Javascript

function isPalindrome(palindrome) {
  var length = palindrome.length;
  for (var i = 0; i < palindrome.length; i++) {
    if (palindrome[i] !== palindrome[length - (1 + i)]) {
      return false;
    }
  }
  return true;
}

Usage

console.log(isPalindrome("car")); // false
console.log(isPalindrome("kayak")); // true