then, read the paper A Fresh Look at Efficient Perl Sorting by Uri Guttman and Larry Rosler, for an explanation of advanced sorting techniques in Perl.

Also, take a look at the Perl modules Sort::Maker (implements most of the methods described in the paper) and Sort::Key (probably the fastest).

In reply to Re^5: What are the other option for sorting the keys of hash of hashes by salva
in thread What are the other option for sorting the keys of hash of hashes by luckypower

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