In the world of computer programming, there are multiple different ways to create a solution that does something. However, some might contemplate whether there is a correct way of achieving a specific task. The answer is yes; there is always a right way, but in software development, there are usually multiple ways to achieve a task. Some factors exist, which guide the programmer to the right solution, and depending on them, people tend to get the expected result. These factors could define many things—the actual language being used, algorithm, type of executable produced, output format, and the code structure. In this book, the language is already chosen for us—Scala. There are, however, a number of ways to use Scala, and we will be focusing on them—the design patterns.

In this chapter, we will explain what design patterns are and why they exist. We will go through the different types of design patterns that are out there. This book aims to provide useful examples to aid you in the learning process, and being able to run them easily is key. Hence, some points on how to set up a development environment properly will be given here. The top-level topics we will go through are as follows:

The last point doesn't have to do much with design patterns. However, it is always a good idea to build projects properly, as this makes it much easier to work in future.