(1) To make traverse reusable. You can change the action taken for every node without editing traverse. You can make traverse do two different things without writing two different versions of it.

Hence, I could have done the following just as well -- 

sub traverse {
  # do yer stuff
  _print($_);
  traverse(..);
}

sub _print {
  my ($node) = @_;
  print ' ' x $node->{dept}, $node->{c_id}, ': ', $_->{comm}, "\n";
}

[download]

Which, I did, and it also works. Hence, passing an anon sub as a param seems to be just a fancy way of doing what I already know MTOWODI, no?

--

when small people start casting long shadows, it is time to go to bed

In reply to Re^2: Passing anon sub as param by punkish
in thread Passing anon sub as param by punkish

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