Hello, smls, and thank you VERY much for an over-the-top reply!
The Points Fairy thought so too. :)

In all fairness to anyone looking to respond; I should have probably noted in the OP, that I think my difficulty in following the logic, or flow, seemed to be with my apparent lack of knowledge with the map function. The use of split in the code here, might also be a factor. But, where split is concerned, may well be related to my lack of experience with map, or because this is in JavaScript, not Perl.

Thanks again, smls, for such an informative reply!

--Chris