Functional Programming Patterns in Scala and Clojure

TinyWeb in Scala

Let’s take TinyWeb and transform it into Scala. We’ll do this a bit at a time so we can show how our Scala code can work with the existing Java code. The overall shape of the framework will be similar to the Java version, but we’ll take advantage of some of Scala’s functional features to make the code more concise.

Step One: Changing Views

We’ll start with our view code. In Java, we used the classic Strategy pattern. In Scala, we’ll stick with the Strategy pattern, but we’ll use higher-order functions for our strategy implementations. We’ll also see some of the benefits of expressions over statements for control flow.

The biggest change we’ll make is to the view-rendering code. Instead of using Functional Interface in the ...