Thanks everyone. I always thought I *knew* what splice did (replacing elements), and didn't read the perldocs.

Tests on smaller datasets did indeed show that hashes were significantly faster than arrays here. Deleting the hash-element or just setting it to 0 or undef made very little performance difference on 100 MB files. Deleting the element will prevent any problems with duplicates down the road, so I went that way.

Thanks again monks!

-Tats

In reply to Re: Deleting internal array elements by Itatsumaki
in thread Deleting internal array elements by Itatsumaki

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