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How to Collapse Nested Map into a Sequence of Flat Maps

 
Ari King
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Posts: 20
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How I can collapse a nested map with "n" number of keys (tiers) to create a sequence of flat maps which are comprised of composite keys and a values.

For example, let's say we have:



I'd like to collapse the nest into a sequence of flat maps like:

 
Ari King
Greenhorn
Posts: 20
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I've put together a solution (see below) that collapses nested maps into a sequence of flat maps with composite keys. Unfortunately, the solution wraps the result within another list, anyone know why? Thanks.

 
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