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It's compact, but far and away the slowest method.

However, you can combine elements of yours with tilly's performance trick and get something that is both fairly compact and almost as quick.

#! perl -slw use strict; use Benchmark qw(:all) ; my @a; push @a, int (rand(100)) foreach 1..100_000; my( @jc, @mk, @bt, @buk, @etc ); my %tests = ( jc => sub { my %unique; foreach my $thingy (@a) { $unique{$thingy} = 1; } @jc = keys %unique; }, mk => sub { my %unique; @unique{ @a} = 1; @mk = keys %unique; }, bt => sub { my %unique; undef(@unique{@a}); @bt = keys %unique; }, etc => sub { @etc = keys %{{map {$_=>1} @a }}; }, buk => sub { @buk = keys %{ +do{ my %u; undef( @u{ @a } ); \%u } }; }, ); #cmpthese( 1, \%tests ); #print scalar @$_ for \( @jc, @mk, @bt, @buk ); cmpthese( -3, \%tests ); __END__ P:\test>324513 Rate etc jc mk buk bt etc 4.75/s -- -82% -94% -95% -95% jc 26.1/s 449% -- -65% -72% -72% mk 74.3/s 1463% 184% -- -21% -22% buk 93.6/s 1870% 259% 26% -- -1% bt 94.6/s 1891% 262% 27% 1% --

Examine what is said, not who speaks.
"Efficiency is intelligent laziness." -David Dunham
"Think for yourself!" - Abigail

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

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