Oh, you're right. I thought that was part of your code, because I saw you used a map :p This is actually an issue then.

Edit: node 8 disabled.

Did you select node v18 at the top? If that doesn't fix it, maybe you modified sample tests?

Either way, you should include the actual error message, not just the line that caused the error. If I run your code with node 8, I get "SyntaxError: Unexpected token ?", which makes sense, because ?? didn't exist in earlier versions.

You are welcome! Part 2 just got approved. https://www.codewars.com/kata/665bf5790be3c249ffb9422b