##
%key = (
foo => 'bar',
bazz => 'bump',
ping => 'pong',
putt => 'pop',
);
##
##
%key = (
foo => 'bazz',
ping => 'putt',
);
##
##
%key = (
foo => 'bar',
bazz => 'bump',
ping => 'pong',
putt => 'pop',
);
my @keys = keys %key; # foo, bazz, ping, putt
%key = @keys; foo => bazz, ping => putt