To do this, pass references to the arrays and dereference in the subroutine:

process_something($scalar1, $scalar2, \@list1, \@list2);

sub process_something
{
    my ($scalar1, $scalar2, $ra_list1, $ra_list2) = @_;
    my @list1 = @$ra_list1;
    my @list2 = @$ra_list2;
}
[download]

Another way is to pass all parameters in a hashref:

my $rh_params = {
    scalar1 => $scalar1,
    scalar2 => $scalar2,
    list1   => \@list1,
    list2   => \@list2,
};

process_something($rh_params);

sub process_something
{
    my $rh_params = shift;
    my $scalar1 = $rh_params->{scalar1};
    my $scalar2 = $rh_params->{scalar2};
    my @list1 = @{$rh_params->{list1}};
    my @list2 = @{$rh_params->{list2}};
}
[download]

The second method involves more coding but provides a number of benefits:

• No more concerns about getting parameters in the right order
• Any, or all, parameters can be optional with the subroutine setting defaults for missing keys
• Add or remove parameters without changing the subroutine signature
• It also affords a certain degree of data encapsulation

---

Update: Added missing line: process_something($rh_params);

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