One thing I'd like to add is that returning a hash reference allows for beatiful syntax when you're using a single element from it.
sub hash { qw(foo bar baz xyzzy) }
sub hashref { { qw(foo bar baz xyzzy) } }
my $dummy;
# Using a single element only
$dummy = ${ hash }{foo}; # UGLY!
$dummy = hashref->{foo}; # Neat!
# or hashref()->{foo}
# or hashref->{'foo'}
# etcetera.
But in the end, it's all up to you. Be sure to document your choise!
Originally posted as a Categorized Answer.
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