Using Bloom FiltersUsing Bloom Filters Apr 8, 2004 by Maciej Ceglowski Anyone who has used Perl for any length of time is familiar with the lookup hash, a handy idiom for doing existence tests: foreach my $e ( @things ) { $lookup{$e}++ } sub check { my ( $key ) = @_; print "Found $key!" if exists( $lookup{ $key } ); } As useful as the lookup hash is, it can become unwieldy for very large lists or in cases where the
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