sub switch ($$);


for my $var (1..4) {
    my $i;
    
    switch $var =>
      {
          1  => sub { $i = "One"},
          2  => sub { $i = "Two"},
          3  => sub { $i = "Three"},
          '' => sub { $i = "Other"},
      };

    print "$var is $i\n";
}

sub switch ($$) {
    my ($case, $href) =@_;
    if ( exists $href->{$case} ) {
        $href->{$case}->();
    } else {
        $href->{''}->();
    }
}