There aren't any standards per se, but I think you can find some useful discussions of subroutines at the following links:

1. A question about the best way to use subroutines by scottstef
   To be less than modest, I think my reply to that node was fairly decent.


2. When do you function? by zdog
   The first reply to that link is by tilly and, as usual, is excellent.

Cheers,
Ovid

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