ColinEberhardt/LinqToObjectiveC — pull request #8 by lehn0058 (2014-10-17 15:47:11+00:00)
Title: Added the 'sum' operation to the NSArray method extensions and unit test...

I have found myself wanting to use a 'sum' operation on arrays for some time, and this is included in the C# Linq extensions. I thought I would add it here too.