function isPalindrome(str) {
  return [...str].reduce((previous, next) => next + previous) === str
    ? `${str}: is a Palindrome :)`
    : `${str}: is not a Palindrome :(`;
}

console.log(isPalindrome("nope this isn't")); // false
console.log(isPalindrome("mom")); // true
console.log(isPalindrome("gohangasalamiimalasagnahog")); // true, I think