I would say that's a bit messy syntax. Function should be declared at least with 'const' keyword.

Thank you!

It matches all whitespace characters like tabs or newlines. It's not better, in fact it's likely slower, but it might be more robust in a real world scenario.

this is longer and more complicated than the original, so how do you think it's better?

Nice edge case addition

Nice!

Nice. Very clean, succinct, readable.