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When we introduce Scala into a organisation, at some point we find someone who makes one or both of these assertions:

• Scala developers are “expensive”.
• Scala is hard to understand.

We’ve tackled this a number of times and would like to share the results of our fact finding and experience.

In this post we’ll look at the misconception of Scala developers being expensive.

I recently came across another elegant use of the type class pattern, so I thought I'd share it with here.

I spent last week in the lovely city of Edinburgh attending COLT and ICML. I’m still digesting a lot of what I saw, but I thought it might be interesting to give a quick list of my highlights.

This is a simple example of use of a mysterious beast called a Kleisli arrow.

I will be using scalaz for my incantations as it comes with the necessary potions.

Here is an example of so-called phantom types and covariance in Scala to improve type safety and correctness. The example is a simplified version from a real project.

I present the example as source code so you can copy into an editor and play with it. References for further reading are given at the bottom of the post.