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perlreferencedereference

How can I pass the elements in a Perl array reference as separate arguments to a subroutine?

I have a list that contains arguments I want to pass to a function. How do I call that function?

For example, imagine I had this function:

sub foo {
  my ($arg0, $arg1, $arg2) = @_;
  print "$arg0 $arg1 $arg2\n";
}

And let's say I have:

my $args = [ "la", "di", "da" ];

How do I call foo without writing foo($$args[0], $$args[1], $$args[2])?

Solution

  • This should do it:

    foo(@$args)

    That is not actually an apply function. That syntax just dereferences an array reference back to plain array. man perlref tells you more about referecences.