Here is a Gist I just published on GitHub of a utility function that performs a cross-join between two Swift arrays. This allows you to iterate over one array for every element in another array, and return an optional value built for each pair of array elements.
This code was compiled and tested against Xcode 6 Beta 3.
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About Josh Smith
Josh Smith is a musician at heart, and a software developer by obsession. He lives in Arizona, plays classical music on the piano, jazz on the guitar, and enjoys brutally long rides on his bicycle. He has a wonderful wife & son and thinks that, in general, life is good.
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