How about this:

use CGI qw(:all);
my $op = param('operation');

my $table = create_dptable TestPkg;
$table->{$op}->() if exists $table->{$op};
[download]

As opposed to this:

use CGI qw(:all);
my $op = param('operation');

{
    no strict 'refs';
    TestPkg->$dispatch('Hello!')
        if defined *{"TestPkg::$dispatch"}{CODE};
}
[download]

Or what about this:

my $input = <>;

my $table = create_dptable TestPkg;
$table->{$_}->($input) foreach (keys $table);
[download]

As opposed to this:

my $input = <>;

{
    no strict 'refs';
    *{"TestPkg::$_"}{CODE}->($input)
        foreach( grep {    !/^_/
                        && defined *{"TestPkg::$_"}{CODE} }
                 keys %{*{'TestPkg::'}}
        ); 
}
[download]

Essentially, the gain of a dispatch table is the gain of all of the advantages and techniques of working with hashes.

Update: Added another example.

---

---

Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!

Titles consisting of a single word are discouraged, and in most cases are disallowed outright.

Read Where should I post X? if you're not absolutely sure you're posting in the right place.

Please read these before you post! —

• How do I compose an effective node title?
• How do I post a question effectively?
• Markup in the Monastery

Posts may use any of the Perl Monks Approved HTML tags:

a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr

You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)

	For:		Use:
	&		&
	<		&lt;
	>		&gt;
	[		&#91;
	]		&#93;

Link using PerlMonks shortcuts! What shortcuts can I use for linking?

See Writeup Formatting Tips and other pages linked from there for more info.