Re: Possible pitfall with Slices

[Fastolfe]

A better way of doing this:

@a{qw{ a b c }} = ();    # not (1)x3 or whatever

foreach (qw{ a b c }) {
  print "$_\n" if exists $a{$_};
}

Thus we don't have to worry about being sure the values of the hash are all present and what-not. Specify an empty list on the right-hand-side to set the values all to undef, and just use exists to see if it's there. It's also slightly faster (but not much).