What's the difference between return; and return undef; in Perl

Question

Is there a difference between a subroutine that does

return;

and one that does?

return undef;

Answer 1

I think I still agree with PBP though.

1) You should avoid nesting function calls:

my $result = bar();
foo(1, $result, 2);

2) You should always be explicit (when doing "complicated" things):

foo(1, scalar bar(), 2);