in reply to Re: Challenge: Perl 5: lazy sameFringe()?
in thread Challenge: Perl 5: lazy sameFringe()?

# create a subthread for each tree executing the above recursiveFringe
   # in such a way that the output from print above can be read in
   # while(<...>) in the main thread.
   # once a difference occurs return FALSE and terminate threads

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That looks more like a fork-based approach than a thread based.

See mine for a recursion and threads approach.

I'd love to see a Coro solution here.

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