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Learning Scala Programming

Learning Scala Programming

By : Sharma
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Learning Scala Programming

Learning Scala Programming

2 (3)
By: Sharma

Overview of this book

Scala is a general-purpose programming language that supports both functional and object-oriented programming paradigms. Due to its concise design and versatility, Scala's applications have been extended to a wide variety of fields such as data science and cluster computing. You will learn to write highly scalable, concurrent, and testable programs to meet everyday software requirements. We will begin by understanding the language basics, syntax, core data types, literals, variables, and more. From here you will be introduced to data structures with Scala and you will learn to work with higher-order functions. Scala's powerful collections framework will help you get the best out of immutable data structures and utilize them effectively. You will then be introduced to concepts such as pattern matching, case classes, and functional programming features. From here, you will learn to work with Scala's object-oriented features. Going forward, you will learn about asynchronous and reactive programming with Scala, where you will be introduced to the Akka framework. Finally, you will learn the interoperability of Scala and Java. After reading this book, you'll be well versed with this language and its features, and you will be able to write scalable, concurrent, and reactive programs in Scala.
Table of Contents (16 chapters)
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Abstract types


Okay, first things first. We tried to achieve abstraction when we introduced type parameterizing. We will do the same thing using abstract type members. But what's an abstract type member? How do we write them, how can we use them, and why do we even need them when we already have parameterized types? These are a few questions. We'll try answering them. So let's start with the first question. How do we write an abstract type. This is done as follows:

trait ThinkingInTermsOfT { 
      type T 
} 

Okay, we just wrote a trait named ThinkingInTermsOfT and it has an abstract type member. So, to declare an abstract type member we use the keyword type along with the parameter name that in our case is T. From our elementary Scala introduction or, let's say, from previous chapters, we know how we can instantiate a trait. So when we instantiate our trait, we'll give a type to our abstract member. That's going to be a concrete type:

val instance = new ThinkingInTermsOfT { 
  type T = Int...

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