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Calling undef on a hash slice is faster still.
use Benchmark qw(:all) ; my @a; push @a, int (rand(10)) foreach 1..100; my %unique; my @awd; cmpthese($1000, { 'jc' => sub { foreach my $thingy (@a) { $unique{$thingy} = 1 +; } @awd = keys %unique; }, 'mk' => sub { @unique{ @a} = 1; @awd = keys %unique; }, 'bt' => sub { undef(@unique{@a}); @awd = keys %unique; }, });
gives me
Rate jc mk bt jc 16556/s -- -54% -62% mk 36080/s 118% -- -18% bt 44007/s 166% 22% --
(Incidentally that is a truely bizarre indent style.)

In reply to Re: Re: Find unique elements in an array by tilly
in thread Find unique elements in an array by jcpunk

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