> I'd appreciate suggestions and insights on how I can collapse a nested
> map with "n" number of keys (levels) to create a flat map which is
> comprised of composite keys and a value. For example, let's say we
> have:
>
> { "a" { 2011 [ [ "a" 2011 "ari"] [ "a" 2011 "dan"] ] } { 2010 [ [ "a"
> 2010 "jon"] ] } }
>
> I'd like to collapse the nest into a sequence of flat maps like:
>
> ( { [a 2011] [ ["a" 2011 "ari"] ["a" 2011 "dan"] ] }, { [a 2010]
> [ ["a" 2010 "jon"] ] } )
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.
(defn collapse [data & keys-coll]
(if (map? data)
(for [[k v] data]
(collapse v (if (nil? keys-coll)
(conj [] k)
(conj (into [] keys-coll) k))))
(hash-map (flatten keys-coll) data)))
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