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  1. or download this
    use Foobar;

...
    Foobar::some_method();
}
  2. or download this
    my $f = Foobar->new();
$f->some_method();
  3. or download this
    sub class_or_instance
{
...
Foobar->class_or_instance()  # passes class name "Foobar" in as @_[0]
my $f = Foobar->new();
$f->class_or_instance();     # passes object $f in as @_[0]
  4. or download this
    Foobar::class_or_instance('blech');