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- References and Autovivification
- Autovivification and Lists
- Autovivification and Deeply Nested References
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Autovivification and Lists
The same thing occurs with an array reference as with the hash reference. In the following snippet, Perl sees that $aref->[2] was being used as an array reference (attempting to get the first element of the non-existent reference), and autovivified it. When done, $aref will contain three elements, the last one being an empty list.
01: my $aref = [[1, 2, 3], [one, two, three]];
02: print @$aref . "\n"; # prints 2
03: print $aref->[2][1]; # prints nothing, since it doesn't exist
04: print @$aref . "\n"; # prints 3