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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 versus parameterized types


Both are forms of providing polymorphic abstractions in Scala. Mostly, it's a design choice whether you prefer one over the other. Talking about design choices, let's have a closer look. For that we'll take an example where we have two class hierarchies as follows:

abstract class Food 
class Grass extends Food 
class Meat extends Food 
 
abstract class Animal { 
   type SuitableFood <: Food 
   
   def eatMeal(meal: SuitableFood) 
} 

From the knowledge about abstract types and upper bounds we can say Animal is an abstract class, which has an abstract type member named SuitableFood, which expects only the Food type. If we declare two subtypes of Animal class namely Cow and Lion it could look like a cow can eat Grass as well as Meat because both are subclasses of Food. But this isn't the desired behavior. To resolve the issue, we can declare Cow like this:

class Cow extends Animal { 
  type SuitableFood <: Grass 
 
  override def eatMeal(meal: SuitableFood...

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