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All the Perl that's Practical to Extract and Report

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  • I played a bit with the concept, and found an issue I can't resolve, possibly you can help me here. The problem concerns whether $_ is an alias or a copy to the parameter passed. If it is a copy then you can't modify it unless it is a reference. If it is an alias you can't modify it if it is read-only. You may ask why should it be modified at all, and here comes the classic unfoldr:

    unfoldr { $_ ? ($_, $_ - 1) : () } 10;


    which allows to pass arbitrary values to the callback .