Two PointersAI-assisted round

Check if a string is a palindrome

Return true if a string reads the same forward and backward, considering only letters and digits and ignoring case. Return false otherwise.

AIThe assistant proposed this solution

“I strip out everything that isn't a letter or digit, then walk two pointers in from both ends comparing characters. If they ever disagree it's not a palindrome. Clean and linear.”

1function isPalindrome(s) {

2 const clean = [...s].filter((c) => /[a-z0-9]/i.test(c));

3 let left = 0, right = clean.length - 1;

4 while (left < right) {

5 if (clean[left] !== clean[right]) return false;

6 left++;

7 right--;

8 }

9 return true;

10}

Before you accept this, make the call. What's your verdict?