Delete all hash entries except for a specific list

[Bob Showalter]

Consider,

   my %hash = (
      foo => 1,
      bar => 2,
      baz => 3,
      qux => 4,
   );

I would like to remove all the entries in the hash except for 'bar' and
'qux'. (Actual hash has other entries which can vary at runtime. I know that
I only want to keep 'bar' and 'qux' however).

Here's what I'm doing:

    my @keys = qw(bar qux);
    my @values = @[EMAIL PROTECTED];
    %hash = ();
    @[EMAIL PROTECTED] = @values;

Is there a more elegant approach?

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