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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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What are closures?


We'll solve the problem in the previous section using closures. But first, let's explain the concept of a closure. In programming terminology, a closure has more than one definition:

  • A closure is simply a function value that gets created at runtime and encompasses a reference to a free variable that's not in the local scope
  • A closure in practical terms is a function that you can pass around that retains the same scope and values as the ones it had at the time of creation

What do we mean by these statements? Let's check that using a very simple, but a fun example:

object AClosure extends App { 
 
  var advertisement = "Buy an IPhone7" 
 
  val playingShow = (showName: String) => println(s"Playing $showName. Here's the advertisement: $advertisement") 
 
  playingShow("GOT") 
  advertisement = "Buy an IPhone8" 
 
  playingShow("GOF") 
 
} 

The result is as follows:

Playing GOT. Here's the advertisement: Buy an IPhone7
Playing GOF. Here's the advertisement: Buy an IPhone8

So,...

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