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Professional Scala

Professional Scala

By : Hartmann, Shevchenko
4.2 (13)
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Professional Scala

Professional Scala

4.2 (13)
By: Hartmann, Shevchenko

Overview of this book

This book teaches you how to build and contribute to Scala programs, recognizing common patterns and techniques used with the language. You’ll learn how to write concise, functional code with Scala. After an introduction to core concepts, syntax, and writing example applications with scalac, you’ll learn about the Scala Collections API and how the language handles type safety via static types out-of-the-box. You’ll then learn about advanced functional programming patterns, and how you can write your own Domain Specific Languages (DSLs). By the end of the book, you’ll be equipped with the skills you need to successfully build smart, efficient applications in Scala that can be compiled to the JVM.
Table of Contents (10 chapters)
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Chapter 5. Scala Type System

In the previous chapter, we covered how to work with lists, which made us familiar with some design principles of the whole collections library. We also covered how to generalize to sequences and covered some more relevant data structures. Finally, we also covered how collections relate to monads and how we can use that knowledge to use some powerful abstractions in our code.

In this chapter, we will cover the type system and polymorphism. We will also cover the different types of variance, which provides a way to constrain parameterized types. Finally, we will cover some advanced types such as abstract type members, option, and so on.

Scala is statically typed. This means that the type of variables are known at compile time. The main advantage of statically typed languages is that a lot of checks can be done by the compiler, thus increasing the number of trivial bugs that are caught at an early stage. Statically typed languages are also friendlier...

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