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How do I print out or copy a recursive data structure?

by faq_monk (Initiate)
on Oct 08, 1999 at 00:20 UTC ( #640=perlfaq nodetype: print w/ replies, xml ) Need Help??

Current Perl documentation can be found at perldoc.perl.org.

Here is our local, out-dated (pre-5.6) version:

The Data::Dumper module on CPAN is nice for printing out data structures, and FreezeThaw for copying them. For example:

    use FreezeThaw qw(freeze thaw);
    $new = thaw freeze $old;

Where $old can be (a reference to) any kind of data structure you'd like. It will be deeply copied.

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