in reply to Re^2: An iterator for (not "iterating") a recursive data structure.
in thread An iterator for (not "iterating") a recursive data structure.

++. It looks like I forgot to test my code for false values (it took me a while to see where they wouldn't work, it was the very last line where I iterate while the value is true).

Thanks for the correction, for some reason I'm still not sure I would have thought of it even nowadays. I suppose I don't really think about using the number of returned values when I'm expecting a scalar, rather than a list

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Re^4: An iterator for (not "iterating") a recursive data structure.
by LanX (Saint) on Jul 09, 2019 at 08:46 UTC
[reply]

      ... OK, I'll have to seriously train myself to use that idiom.

[reply]
        To be fair, the semi predicate problem will still show up if you want an empty array to be a valid return value.

        But there are ways to fix it:

        • return an array ref hence a scalar
        • throw an exception via die and catch it with eval block (or better Try::Tiny )
        • do a goto to an external label named FINISHED or similar (totally undervalued option)

        Cheers Rolf
        (addicted to the Perl Programming Language :)
        Wikisyntax for the Monastery FootballPerl is like chess, only without the dice

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