Review first project in js Palindrome Checker?

Tell us what’s happening:
Is there a better shortcode than this?

  **Your code so far**

function palindrome(str) {

str = str.toLowerCase().replace(/[\W_]/g, '');
for(var i = 0, len = str.length - 1; i < len/2; i++) {
  if(str[i] !== str[len-i]) {
    return false;
  }
}
return true;
}

console.log(palindrome("0_0 (: /-\ :) 0-0"));

console.log(palindrome("five|\_/|four"));
  **Your browser information:**

User Agent is: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/96.0.4664.110 Safari/537.36

Challenge: Palindrome Checker

Link to the challenge:

You really should avoid using var