You can pass a hash as parameters list: 

sub prog {
  my %args =
    ( a => 'default_a',
      b => 'default_b',
      c => 'default_c',
      d => 'default_d',
      @_
    );
  print "a => $args{a}\n";
  print "b => $args{b}\n";
  print "c => $args{c}\n";
  print "d => $args{d}\n";
}
prog( b => 1, a => 2);

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In reply to Re: Optional parameter passing to a function?? by ccn
in thread Optional parameter passing to a function?? by pijush

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