In this subsection, we will provide a class diagram for the builder pattern the way it was classically defined and the way it looks in other languages, including Java. Later, we will present different versions of the code on the basis of them being more appropriate for Scala and of the observations and discussions we will have around them.
Let's have a Person class with different parameters—firstName, lastName, age, departmentId, and so on. We will show the actual code for it in the next subsection. Creating a concrete constructor, especially if those fields might not always be known or required, might take too much time. It would also make the code extremely hard to maintain in the future.
A builder pattern seems ...
