Returning False in Palindrome Checker

Tell us what’s happening:
Why is it not returning as false when it is not a palindrome? I have inserted the return false part outside the for and if statement.

Your code so far

function palindrome(str) {
  // Good luck!
  for(let i = 0; i<=str.length; i++) {
  if(str[i].charAt(0) === str[i].charAt(str[i].length[i]-1)) {
    str.toLowerCase().split(' ').join('');
  return true;
  return false;


Your browser information:

User Agent is: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/73.0.3683.86 Safari/537.36.

Link to the challenge: