Check if a string is a palindrome with recursion

palindrome.js

function isPalindrome(input){
  if(input.length == 0 || input.length ==1 ){
    return true
  }
  
  if(input.charAt(0) == input.charAt(input.length -1 )){
    return isPalindrome(input.substring(1, input.length -1)
  }
                        
  return false;
}
  
isPalindrome('kayak')
//true