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  1. or download this
    my $bar = sub { # do something here };
$bar->(); # executes the stuff in the anonymous sub above
  2. or download this
    sub foo {
     # do something here
...

my $bar = \&foo;
$bar->(); #executes the stuff in foo()
  3. or download this
    my %actions = (
     foo => \&do_foo, # some long operation
...
else {
     $actions{ default }->();
}