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  1. or download this
    my $function = sub {
    # ...do stuff...
...

# Call the sub
$function->('param');
  2. or download this
    sub function {
    # ...do stuff...
...

# Call the sub
function('param);
  3. or download this
    my $vars = {
    'date'    => $date,
    'format'  => sub { return ucfirst lc $_[0]; },
};
$template->process('example.tt', $vars);