@data = (
 {foo => 1, bar => 'sdf', baz => 'aa'},
 {foo => 4, bar => 'wrtvdf', baz => 'bb'},
 {foo => 76, bar => 'erteg', baz => 'cc'},
 {foo => 2, bar => 'dhrthy', baz => 'dd'},
 {foo => 5, bar => 'rtyfgrty', baz => 'ee'},
 {foo => 1, bar => undef, baz => 'ff'}, # did you notice we had one less @bar ?
);