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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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Pattern matching


We use pattern matching to execute code on a case-by-case basis. Take a look at the following:

val somelist = List(1,2,3) 
 
somelist match { 
  case Nil => Nil 
  case _ => ??? 
} 

By taking a look at the structure of our pattern match expression, we see a few things. First, we execute a match on some value followed by the match keyword and then we put cases. For each case we specify some patterns. Now, the pattern can be a constant value, a variable, or even a constructor. We'll soon have a look at all of these patterns. Pattern matching also allows us to put guards on our match in the form of a condition. In that case, the pattern will only match if the condition is applicable. If you take a look at the previous toy example about somelist, you'll see there's an ­_ underscore. It's called a wildcard pattern. It'll match all values or patterns against the case. Logically, you can't put another case after a wildcard. For example, the following does not make any sense...

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