in reply to How's your Perl?

I could solve 5 of them.

UPDATE: read some solutions. So you accept mine for 3 and 4. Quiestion 10 is really trickey.

UPDATE: please someone explain why my solution to 8 works. I don't understand. Thx.

UPDATE: I still don't know how my solution to 8 works, I've found it accidentally, but I see that there's a similar solution using $^N. (And one even with $1, wow!) (The official solution which uses $| is eaasier to understand.)