Complex Datatypes

Frequently, data used by a program is significantly more complex than the simple Perl datatypes can represent alone.  References are used to build "nested" datatypes:

    $baz{foo} = \$foo;
    $baz{bar} = \@bar;
    $baz{doit} = \&doit;
    $baz{duck} = \*duck;

Our little %baz now has everything inside it.