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  1. or download this
    $ perl -wE 'sub f { 42 } say f()'
42
$ perl -wE 'sub f { 42 } say &f()'
42
  2. or download this
    $ perl -wE 'sub f { 42 } my $x = f(); say $x'
42
$ perl -wE 'sub f { 42 } my $x = &f(); say $x'
42
  3. or download this
    $ perl -wE 'sub f { 42 } my $x = \f(); say $x'
SCALAR(0x7fc8f2805480)
$ perl -wE 'sub f { 42 } my $x = \&f(); say $x'
SCALAR(0x7f9783805480)
  4. or download this
    $ perl -wE 'sub f { 42 } my $x = \f(); say $$x'
42
$ perl -wE 'sub f { 42 } my $x = \&f(); say $$x'
42