Getting False on a recursive function with if conditions trying to solve the "Palindrome" Challenge

So I was doing this popular challenge "palindrome" and I was copying this solution from the "Frontend Masters" Javascript Series and I’m getting a different output. I want to know if there is something that changes or am I missing something. This is my first question on StackOverflow because this is just MindF***k.

What is going on?


'use strict'

function isPalindrome(str) {
  if (str.length <= 1) return true;
  var first = str[0];
  var last = str[str.length - 1];
  if (first === last) {
    console.log(str.substring(1, str.length - 1))
    isPalindrome(str.substring(1, str.length - 1));
  }
  return false;
}

console.log(isPalindrome("abcdcba")) // Return false on my machine

I try this on the RunJS app as well as the VScode terminal and also I run Node on the file.

KEEP RETURNING FALSE !!

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