each has a global effect because the counter is changed on the data structure, when it's used at several different code places.

From each docs:

> Each hash or array has its own internal iterator, accessed by each, keys, and values. The iterator is implicitly reset when each has reached the end as just described; it can be explicitly reset by calling keys or values on the hash or array.

IIRC is Data::Dumper resetting the counter internally.

see also do-not-use-each by Reini Urban.

Honestly I don't understand your intention, because Dumper is already recursively descending into the nested data structure. And those modules can't achieve it without using keys or values.

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

update

rephrased and added references.

In reply to Re: Data::Dumper and Data::Printer continual output (each side effects) by LanX
in thread Data::Dumper and Data::Printer continual output by opaltoot

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