Perl's own documentation on this subject is very good. (Refer to the section "Using References" of perldoc perlref

Grandfather is recommending rule 2 because it always works. The other rules are essentially "short cuts" which apply in special cases.
Bill

In reply to Re^2: printing all values in a hash of hashes of arrays by BillKSmith
in thread printing all values in a hash of hashes of arrays by estreb

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