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my @questions = (
    { foo => 'bar' },
    { foo => 'bar' },
    { foo => 'bar' }
);

foreach $hashref (@questions){
      my $foo = $hashref->{foo} || "daklfjsdalk";
}

for(my $i = 0;$i<=$#questions;$i++){
       my $foo = $questions[$i]->{foo} || "daklfjsdalk";
}