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

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

In Section Seekers of Perl Wisdom