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All the Perl that's Practical to Extract and Report

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  • Personally I'd put the initialisation of %rev_types outside the subroutine (but inside anther block to limit the scope) to avoid initialising it each time through the subroutine. But this may well smack of premature optimisation. Then again, it makes it clear that it's a constant structure.

    • I usually do that too.

      But beware. Sometimes that practise bites me when I eventually implement a class, not in it's own .pm file like I usually do, but just by switching package in the .pl file. So the variable initialization doesn't happen until afterwards and I end up with an empty data structure.

      And there is much confusion.
      • That's why you should do declaration and initialization in separate steps, and wrap the initialization with a BEGIN.

            my %dispatch;
            BEGIN {
                 %dispatch = (
                     foo => sub { ... },
                     bar => sub { ... },
                     baz => sub { ... },

            sub quux {