This is discussed in Chapter 9, "Subroutines" of Perl Best Practices in the first item "Call subroutines with parentheses but without a leading &". Luckily, Chapter 9 happens to be the free sample chapter from this book. Conway argues that leaving off the parens from user-defined subroutines makes them harder to distinguish from built-ins. See also rule 113 in Vromans PBP reference card.

In reply to Re: [beginner is learning] How comes before I ask a question here, it is answered by eyepopslikeamosquito
in thread [beginner is learning] How comes before I ask a question here, it is answered by aquaplanet

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