I've nested foreach loops like this:

  for i in A[i] do:
    for j in B[j] do:
      append B[j] to some list if B[j] 'matches' A[i] in some fashion.

Each element in A or B is some complex structure like:
(
  some complex JSON,
  some number
)

Question: if A and B were represented as RRDs (e.g. RRD(A) and RRD(B)), how
would my code look ?
Are there any RRD operators that would allow me to loop thru both RRDs like
the above procedural code ?
I can't find any RRD operators nor any code fragments that would allow me
to do this.

Thing is: by that time I composed RRD(A), this RRD would have contain
elements in array B as well as array A.
Same argument for RRD(B).

Any pointers much appreciated.

Thanks.


-- 

-eric ho

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