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)

Understanding Algebraic Structures

In the previous chapter, we looked at some standard Scala effects and identified lots of similarities among them. We also promised to dive deeper and find out what principles underly these commonalities.

Before diving deep into the ocean of abstractions, let's fish for the simpler concepts first to gain some familiarity and skill working with them.

In this chapter, we’ll take a look at a few abstract algebraic structures—structures that are fully identified by the laws defining them. We will start with a simpler yet usable abstraction and advance to more complex topics.

In this chapter, we will take a look at the following topics:

  • Semigroup
  • Monoid
  • Foldable
  • Group