How to map hash keys only, not values?

[Peter_Farrar]

Hi All,

I'm passing a hash to a subroutine like this:
      subname("a" => 123, "b" =>"fff", "C" => "joyjoyjoy");

On the receiving side I want all keys to be upper case.  I can map like
this:
      sub subname{
            map {$_ =~ tr/a-z/A-Z/} @_;
            my %values = @_;
            ..
      }

and I can live with that I guess.  But really I just want to push the keys,
not the values, into upper case.

Is there a way to just map the keys?  I can't think of one.

TIA,
Peter





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