Well I think it depends on the testcase, I tried random numbers in an intervall 1..1e6 like BUK did.

See my benchmark here RFC extending Benchmark.pm to facilitate CODEHASHREF

Maybe I did something wrong ...

... but I'm not to keen to continue, IMHO all approaches are already fast enough.

Cheers Rolf

( addicted to the Perl Programming Language)

update

oops undef @hash{@arr} is significantly faster than @hash{@arr}=()

In reply to Re^4: Best method to diff very large array efficiently by LanX
in thread Best method to diff very large array efficiently by newbieperlperson

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