I have a loop over a function that is accumulating a list of database keys for later use. But it is primarily doing other processing and returning a collection of processed/filtered records. I'd normally just PUSH the ids and records onto a list in Common Lisp, or even LOOP... COLLECT into 2 lists. In the Clojure way, how would I build this auxiliary list without using a mutable collection? Would it make sense to return a map or some other structure from the processing function that would contain both the processed record as well as any id of interest? I could accumulate this result, then filter the map into 2 collections - one of processed records and the other a subset of id's of interest. But that seems kludgy commingling the results like that.
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