How do you use autovivification with a short example?

Autovivification is a feature in Perl that allows you to automatically create data structures on the fly. This means that when you access a variable that hasn't been initialized, Perl will automatically create it for you, allowing for easier handling of complex data structures like hashes and arrays.

Example of Autovivification in Perl


        # Create a nested hash structure using autovivification
        my %data;
        
        $data{'key1'}{'subkey1'} = 'value1';
        $data{'key1'}{'subkey2'} = 'value2';
        
        print $data{'key1'}{'subkey1'}; # Outputs: value1
        print $data{'key1'}{'subkey2'}; # Outputs: value2