I use that snippet sometimes since some older version of List::Util do not include a uniq function.

The code means:

sub uniq {
   my %h;    # Keep track of things seen.
   
   grep {         # 4: Return items seen only once.

     not $h{$_}++ # 2: Item is not (yet) be seen.
                  # 3: ++ would then say item was seen.
   } @_;          # 1: For each input...
}

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In reply to Re^2: How can I make a string unique (quicker than my approach at least) by Timka
in thread How can I make a string unique (quicker than my approach at least) by Anonymous Monk

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