From: Joel Pearson <lists@...>
Date: 2013-03-05T00:09:46+09:00
Subject: Re: Efficient Ruby equivalent to Excel's "SUMIF"?

Thanks Adam, that's a great way of looking at this!
I've been using arrays quite a lot in Ruby since they're so much easier 
to use than in VBA. When your only tool is a hammer...
I knew the logical answer was some sort of incremental system, but I 
hadn't been able to visualise a way to implement it. Hashes look like a 
great solution.

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