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Here is a faster solution, using a hash slice:
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; }, });
The results are
Benchmark: running jc, mk for at least 3 CPU seconds... jc: 3 wallclock secs ( 3.14 usr + 0.00 sys = 3.14 CPU) @ 53 +5.67/s (n=20522) mk: 4 wallclock secs ( 3.27 usr + 0.00 sys = 3.27 CPU) @ 14 +937.00/s (n=48844) Rate jc mk jc 6536/s -- -56% mk 14937/s 129% --
Update: $1000 is a typo should be 1000. I'll keep it as is for comparisons with the following nodes. Thanks BrowserUK and tilly!


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

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