Scala Design Patterns - Second Edition

Implementation

Let's start writing some code. No! This is wrong. Before we even start to write, we should answer all our questions and be clear with where we are going. Some people like drawing diagrams, others like writing things down, and so on. Everyone has their own techniques. Let's try and come up with a diagram first. It will show the top-level components that we will use, how they communicate with each other, and so on. A visual representation of our application will be extremely valuable to see any issues early and will also help us to implement the application easily:

The preceding diagram shows our future application from a really ...