From: Joel Pearson Date: 2013-03-05T00:24:52+09:00 Subject: Re: Efficient Ruby equivalent to Excel's "SUMIF"? Ooh, pretty. Nice one-liner Hans. I can just about follow it. I hadn't seen "group_by" before. Looks like hashes are definitely the right direction to be working towards for this. -- Posted via http://www.ruby-forum.com/.