Typeclasses, (or type classes), are most famously a language feature of Haskell that has gained interest in the Scala community. Here I describe the basic pattern with references for further study.
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The loan pattern is a common pattern for working with resources that should be closed or otherwise managed after use. It removes responsibility from the developer to manage a resource properly. When loaning several objects, one often ends up with nested functions. Here is a way to flatten that to make things clearer.
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I recently blogged about Functors and mentioned a mysterious beast called Applicative Functor. Here is a simple, complete example that shows how you can use Applicative Functors with the Scalaz library, with references for further reading.
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In the world of functional programming you will quickly come across the concept of a Functor. What I present below is a simple example that might provide some intuition, with references for further reading.
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I wanted a very tiny example of using the IO Monad in the brilliant Scalaz library, and here it is.

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Here are a few useful things you can do easily with Scalaz to make you code a little simpler.
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I attended Scaladays 2010 at EPFL in Lausanne, Switzerland in April. at which Nigel Warren and I presented the work we had done on porting Fly’s Java client library to Scala. You can watch all the Scaladays videos on the Scaladays website and so I will not dwell on the talks, which were excellent. Instead, I want to talk about Scala and its community, led by Martin Ordersky.

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