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)


The type system is one of the key components of the Scala language. It allows the developer to express expectations about the behavior of the program, which can then be checked at compile time. This reduces the number of tests needed to verify the correctness of the solution and the possibility of runtime errors.

Usually, strictly typed languages are associated with verbose code. Normally, this is not the case with Scala because of its powerful type inference mechanism.

Scala allows you to define very narrow types containing a single value as well as much wider types, even those represented as a combination of other types.

The type definition can be made more precise by using type constraints, type parameters, and variance.

We also looked at some examples of how the type system can be used to express domain constraints.

Needless to say, Scala's ecosystem is much richer...