This comes up periodically. The answer is in
perlsub,
if you omit the parens there is an implicit set of arguments
passed which might not be what you want. I consider this
a dangerous style because even if you know about the gotcha,
the person after you might not.
Two other relevant notes. There is a promise that future
Perl built-in functions will be lower case, so some people
like using mixed-case function names. Also using the &
is (IIRC) considerably slower than not using it.
Personally I used to use & all of the time, but now I never
do. I don't consider the arguments either way particularly
convincing on that. But I always put in the parens.
