Depends on which of these is realistically going to make a difference. I'd write something like this:
my $main_menu = Menu->new("main");
my $active_menu_id = get_active_menu(param('menu_item')||'');
$main_menu->active_menu_id($active_menu_id)
if defined $active_menu_id;
$main_menu->output;
The distinction between the user selecting no menu item or submitting an invalid selection is not likely to matter, so I just default that case to a defined but invalid value. Whether or not he has select a valid menu item however definitely is important, so I check that case appropriately.
Btw, indirect object syntax looks neat but has a bunch of caveats. Use the arrow notation instead.
Makeshifts last the longest.
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