From: Joel Pearson <lists@...>
Date: 2013-02-15T19:55:34+09:00
Subject: Re: skip iteration in each loop

You could use Array.partition for that if you wanted both outputs as 
well

discard, keep = [1, 2, 3, 4, 5, 6, 7, 8].partition { |n| [3,4].index n }

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