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Here's a recent question that covers effectively the same problem (except for an array-of-arrays instead of an array-of-hashes): Variable number of foreach loops

---Update:---

To summarize, the options seem to be:

Using a recursive subroutine
Using a loop that increments an array of indices (slow'ish, and probably awkward to adapt for the hash-of-hashes usecase)
Using branching with if/elsif (not very elegant, and not exhaustive on its own)
Using eval (some may consider it evil)
Using mapm from the CPAN module List::MapMulti (convenient but slow)
Using NestedLoops from the CPAN module Algorithm::Loops (convenient but slow)

In reply to Re: Dynamically create a foreach loop within a foreach loop? by smls
in thread Dynamically create a foreach loop within a foreach loop? by jdlev

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