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)

Dealing with Effects

In the previous two chapters, we had quite a shift in perspective. In Chapter 6, Exploring Built-In Effects, we looked at a handful of implementations of the concrete effects available in the standard library. In Chapter 7, Understanding Algebraic Structures we jumped from the real to the theoretical and played with abstract algebraic structures.

Now that we are familiar with the process of working with abstractions defined by laws, we can finally deliver on the promise we gave in Chapter 6, Exploring Built-In Effects, and identify abstractions lying beneath the standard implementations we touched on there.

We'll define and implement a functor, an abstract concept that's useful in relation to any effect. Moreover, we’ll have three different flavors of them, so stay tuned!

By the end of this chapter, you'll be able to identify and implement...