Book Image

Learn Scala Programming

By : Slava Schmidt
Book Image

Learn Scala Programming

By: Slava Schmidt

Overview of this book

The second version of Scala has undergone multiple changes to support features and library implementations. Scala 2.13, with its main focus on modularizing the standard library and simplifying collections, brings with it a host of updates. Learn Scala Programming addresses both technical and architectural changes to the redesigned standard library and collections, along with covering in-depth type systems and first-level support for functions. You will discover how to leverage implicits as a primary mechanism for building type classes and look at different ways to test Scala code. You will also learn about abstract building blocks used in functional programming, giving you sufficient understanding to pick and use any existing functional programming library out there. In the concluding chapters, you will explore reactive programming by covering the Akka framework and reactive streams. By the end of this book, you will have built microservices and learned to implement them with the Scala and Lagom framework.
Table of Contents (19 chapters)


We have discussed three types of implicits in this chapter. These include implicit conversions, implicit classes, and implicit parameters.

We also discussed the syntactic sugar that's provided by the language in the form of view bounds and context bounds. We've seen how the former allows for defining implicit conversions in a somewhat concise way and that the latter does the same for type classes.

We compared object-oriented and type class based approaches in regards to polymorphic behavior. To depend on our knowledge of the topic, we worked through the recursive resolution of case classes and showed an example of type class variance.

In conclusion, we studied how the three levels of implicit scope resolution work. We've shown that all implicits in the lexical scope have the same precedence. The implicit scope is only looked at by the compiler if no suitable...