Perl Style: Use Hashes for the First Time

Jan 1, 1998 by Tom Christiansen

• A hash is a good way to keep track of whether you’ve done something before.

• Embrace the ... unless $seen{$item}++ notation:

      %seen = ();
      foreach $item (genlist()) {
          func($item) unless $seen{$item}++;
      }
  

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Copyright © 1998, Tom Christiansen All rights reserved.