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•Re: Get All Duplicated Elements in an Array (Once, without shifting)

by merlyn (Sage)
on Oct 14, 2002 at 16:19 UTC ( [id://205138]=note: print w/replies, xml ) Need Help??


in reply to Get All Duplicated Elements in an Array (Once, without shifting)

Just grab them only the second time they're seen. 
my @result = do {
  my %counter;
  grep ++$counter{$_} == 2, @input;
};

[download]

-- Randal L. Schwartz, Perl hacker

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