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Home> Programming> Programming Language> Learning Scala Programming
Learning Scala Programming
Learning Scala Programming

Learning Scala Programming: Object-oriented programming meets functional reactive to create Scalable and Concurrent programs

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Learning Scala Programming

Building Blocks of Scala

"You can't build a great building on a weak foundation. You must have a solid foundation if you're going to have a strong superstructure."
- Gordon B. Hinckley

Our aim as programmers is to provide a solution to a problem through some logical implementation. Programming languages work as a tool for just that. When we implement a solution to a problem, we must be able to describe the problem (specification) so that a programming language can verify (verification) whether the solution indeed solves the problem.

Problem Solution

For implementation, we use various programming constructs, which are basic entities with some syntactic rules. These entities work as building blocks for any programming language. In Scala, we have similar syntax to almost any other programming language. We usekeyword/name/classifier/bound-entity. In this chapter...

What is underneath a Scala program?

A Scala program is a tree of nested definitions. A definition may start with a keyword, definition's name, a classifier, and if it's a concrete definition, then also an entity to which that definition is bound. So the syntax is regular, just like any other programming language haskeyword/name/classifier/bound-entity. Let's take an example. We'll use Scala REPL to see how a simple Scala program is built. For that, let's import a Scala package nameduniverse:

scala> import scala.reflect.runtime.universe._
import scala.reflect.runtime.universe._

Thisimport clause brings all the definitions within the universe package in scope. It means that the required functions we are going to use are in scope, and available for us to use. Then we'll use areify method, which returns anExpr to constructtree...

Vals and vars

While writing our Scala programs, we can define our member fields using eitherval orvar keywords. When we use aval keyword to assign a value to any attribute, it becomes a value. We're not allowed to change that value in the course of our program. So aval declaration is used to allow only immutable data binding to an attribute. Let's take an example:

scala> val a = 10
a: Int = 10

Here, we have used aval keyword with an attribute nameda, and assigned it a value10. Furthermore, if we try to change that value, the Scala compiler will give an error saying:reassignment to val:

scala> a = 12
<console>:12: error: reassignment to val
    a = 12

Scala recommends use ofval as much as possible to support immutability. But if an attribute's value is going to change in the course of our program, we can use thevar declaration:

scala> var b...

Data types

We have just covered literals in Scala, and with that, we've almost covered the introduction to all the data types existing as well. We discussed how to defineInt,Long,Short, andByte data types. Along with these, we also coveredFloat andDouble type. Together, all these are called numeric data types. TheByte,Short, andChar are calledsub-range types. We also talked about Boolean, character, and strings:

Numeric value types

In Java, these numeric types are calledPrimitive Types, and then there are user-defined types as well. But in Scala, these somewhat similar types to primitives, are calledvalue types. Objects of these value types are not represented by an object in the underlying runtime system. Thus, arithmetic operations performed are in the form of methods defined forInt, and other numeric value types. Think about it, it means that we can...

Type inference

We can call type inference a built-in Scala feature that permits us to omit type information while writing code. This means we don't have to specify the type while declaring any variables; Scala compiler can do it for us:

scala> val treatMeAString = "Invisible"
treatMeAString: String = Invisible

We did not specify ourval, to be ofString type, but seeing the value ofInvisible, Scala compiler was able to infer its type. Also with some constraints, we can also omit the method's return types:

defcheckMeImaString(x: Boolean) = if(x) "True"else "False"

Here we did not give the return type, as Scala compiler was able to infer its type. But for recursive methods, this doesn't work. The famous factorial method expects you to specify the return type if implementation is recursive:

def recursiveFactorial(n: Int) = if(n...

Operators in Scala

Based on the way we use them, the Scala operators can be classified into three types:

  • Infix operators
  • Prefix operators
  • Postfix operators

We use operators to perform some operation on operands, which is obvious, and the way we implement makes them infix, prefix, or postfix. A basic example of an infix operator is addition+:

scala> val x = 1 + 10
x: Int = 11

We have two operands (1 and 10) on which this addition operation is being performed. We've already discussed thatoperators are methods. It means that somehow the operation is being performed as1.+(10), and1 + 10 is just syntactic sugar of how we can write this. This is possible because the method + is defined for the given types. Here, in our case, the addition (+) method is defined forInt. Along with this, there are several versions of overloaded methods that support other numeric value...

Wrapper classes

In Scala, we can create our own universe, apart from the native methods provided, we can add our own implementations, which we call Rich Wrapper classes. This is possible because ofImplicit Conversions. First, we'll list out someWrappers available already:

Rich wrappers

To see how it happens, let's see an example:

scala> val x = 10
x: Int = 10

scala> x.isValidByte
res1: Boolean = true

The preceding expression tries to check if the value ofx can be converted into aByte, and suffices range of a Byte, and finds it to betrue:

scala> val x = 260
x: Int = 260

scala> x.isValidByte
res2: Boolean = false

scala> val x = 127
x: Int = 127

scala> x.isValidByte
res3: Boolean = true

As you know, range for aByte is -128 to 127. If you try to assign it to a value that's out of range of aByte and expect it to behave like aByte, it won...

What is underneath a Scala program?

A Scala program is a tree ofnested definitions. A definition may start with a keyword, definition's name, a classifier, and if it's a concrete definition, then also an entity to which that definition is bound. So the syntax is regular, just like any other programming language haskeyword/name/classifier/bound-entity. Let's take an example. We'll use Scala REPL to see how a simple Scala program is built. For that, let's import a Scala package nameduniverse:

scala> import scala.reflect.runtime.universe._ import scala.reflect.runtime.universe._

Thisimport clause brings all the definitions within the universe package in scope. It means that the required functions we are going to use are in scope, and available for us to use. Then we'll use areify method, which returns anExpr to constructtree out of our simple Scala program expression. We passed a Scala class to our reify method. Let's pretend that a Scala class encapsulates some members like a value...

Vals and vars

While writing our Scala programs, we can define our member fields using eitherval orvar keywords. When we use aval keyword toassign a value to any attribute, it becomes a value. We're not allowed to change that value in the course of our program. So aval declaration isused to allow only immutable data binding to an attribute. Let's take an example:

scala> val a = 10a: Int = 10

Here, we have used aval keywordwith an attribute nameda, and assigned it a value10. Furthermore, if we try to change that value, the Scala compilerwill give an error saying:reassignment to val:

scala> a = 12<console>:12: error: reassignment to val    a = 12

Scala recommends use ofval as much as possible to support immutability. But if an attribute's value is going to change in the course of our program, we can use thevar declaration:

scala> var b = 10b: Int = 10

When we define an attribute using avar keyword, we're allowed to change its value. Thevar keyword here stands for...

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Key benefits

  • Get a grip on the functional features of the Scala programming language
  • Understand and develop optimal applications using object-oriented and functional Scala constructs
  • Learn reactive principles with Scala and work with the Akka framework

Description

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.

Who is this book for?

This book is for programmers who choose to get a grip over Scala to write concurrent, scalable, and reactive programs. No prior experience with any programming language is required to learn the concepts explained in this book. Knowledge of any programming language would help the reader understanding concepts faster though.

What you will learn

  • * Get to know the reasons for choosing Scala: its use and the advantages it provides over other languages
  • * Bring together functional and object-oriented programming constructs to make a manageable application
  • * Master basic to advanced Scala constructs
  • * Test your applications using advanced testing methodologies such as TDD
  • * Select preferred language constructs from the wide variety of constructs provided by Scala
  • * Make the transition from the object-oriented paradigm to the functional programming paradigm
  • * Write clean, concise, and powerful code with a functional mindset
  • * Create concurrent, scalable, and reactive applications utilizing the advantages of Scala
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Table of Contents

16 Chapters
Getting Started with Scala ProgrammingChevron down iconChevron up icon
Getting Started with Scala Programming
Introduction to Scala
Scala advantages
Working with Scala
Running our first program
Summary
Building Blocks of ScalaChevron down iconChevron up icon
Building Blocks of Scala
What is underneath a Scala program?
Vals and vars
Literals
Data types
Type inference
Operators in Scala
Wrapper classes
String Interpolators
Summary
Shaping our Scala ProgramChevron down iconChevron up icon
Shaping our Scala Program
Looping
The for expressions
Recursion
Conditional statements
Pattern matching
Summary
Giving Meaning to Programs with FunctionsChevron down iconChevron up icon
Giving Meaning to Programs with Functions
Function syntax
Calling a function
Function literals
Evaluation strategies
Partial functions
Summary
Getting Familiar with Scala CollectionsChevron down iconChevron up icon
Getting Familiar with Scala Collections
Motivation
Immutable and mutable collections
Hierarchy of collections in Scala
Commonly used collections in Scala
Rich operations performed on collections
Parallel collections in Scala
Converting a Java collection into a Scala collection
Choosing a collection
Collection performance
Summary
Object-Oriented Scala BasicsChevron down iconChevron up icon
Object-Oriented Scala Basics
Classes
Abstract classes
Objects as singletons
Companion objects
Case classes
Summary
Next Steps in Object-Oriented ScalaChevron down iconChevron up icon
Next Steps in Object-Oriented Scala
Composition and inheritance
Class inheritance
Default and parameterized constructors
Traits
Traits as mix-ins
Linearization
Packaging and importing
Visibility rules
Sealed traits
Summary
More on FunctionsChevron down iconChevron up icon
More on Functions
Function literals
Methods
Functions versus methods
What are closures?
Higher-order functions
Currying
Partially applied functions
Summary
Using Powerful Functional ConstructsChevron down iconChevron up icon
Using Powerful Functional Constructs
For expressions
Pattern matching
Different ways we can pattern match
Option type
Lazy declaration
Tail call optimization
Combinators
Type parameterization
Summary
Advanced Functional ProgrammingChevron down iconChevron up icon
Advanced Functional Programming
Why so serious about types?
Here comes type parameterization
Another way around - generic classes and traits
Type parameter names
Container types
Type erasure
Variance under inheritance
Abstract types
Type bounds
Abstract versus parameterized types
Type-classes
Summary
Working with Implicits and ExceptionsChevron down iconChevron up icon
Working with Implicits and Exceptions
Exception handling – the old way
Using the Option way
Either left or right
Implicits - what and why
Implicit parameters
The implicitly method
Implicit conversions
Looking for implicits
Type-classes ahead!
Summary
Introduction to AkkaChevron down iconChevron up icon
Introduction to Akka
Why do we care about Akka?
What's up with the Actor Model?
Understanding the Actor system
Props
Actor references and paths
Selecting existing actorRefs via actorSelection
How the Actor life cycle works
Hello world in Akka
Writing our first Actor
The tell versus ask versus forward method
Stopping Actors
The preStart and postStop hooks
Actor communication via messages and its semantics
Supervising fault in our actors
OneForOne versus AllForOne strategy
Default supervision strategy
Applying the supervision strategy
Testing actors
Summary
Concurrent Programming in ScalaChevron down iconChevron up icon
Concurrent Programming in Scala
Concurrent programming
Building blocks of concurrency
Asynchronous programming
Parallel collections
Summary
Programming with Reactive ExtensionsChevron down iconChevron up icon
Programming with Reactive Extensions
Reactive programming
Reactive extensions
React to RxScala
Summary
Testing in ScalaChevron down iconChevron up icon
Testing in Scala
The why and what of TDD
ScalaTest
ScalaMock – a native library to mock objects
Summary
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Customer reviews

Rating distribution
Full star iconFull star iconEmpty star iconEmpty star iconEmpty star icon2
(3 Ratings)
5 star0%
4 star33.3%
3 star0%
2 star0%
1 star66.7%
Zachary McDanielApr 08, 2018
Full star iconFull star iconFull star iconFull star iconEmpty star icon4
It's a good book to get a a nice overview of the language but doesn't go very deep into the detail. However it's an easy read and if you just want a sort of crash course in the features of Scala then it works well for that.
Amazon Verified reviewAmazon
MadhavJan 22, 2019
Full star iconEmpty star iconEmpty star iconEmpty star iconEmpty star icon1
This book is a pain in the neck to read and understand. Why? Let me give you a very simple example. The author uses inheritance and abstract classes / traits on page 140 and defines them on page 158 and 169. Why on earth would we be subject to such cruelty? Again.. The author uses the Option type with Failure, Success and Try on page 144 and defines them on page 234- Wow!!! (though it doesn't take long to figure out what these keywords mean). These are some of the numerous instances in the book where concepts are used way ahead of time and defined much later.Also, this book mentions in the preface that no programming experience is necessary. However, you will be crucified if you haven't worked with a single programming language in your life. Moreover, it's good to have some knowledge of Scala (see the awesome Udemy course entitled Rock the JVM) before reading this book. If you do take that course on Udemy, I am sure you will either go straight to Scala docs or read the comprehensive Scala bible (Programming in Scala) by Martin Odersky to advance your knowledge.@Everyone, please stay away from this mess.
Amazon Verified reviewAmazon
GrantSep 08, 2021
Full star iconEmpty star iconEmpty star iconEmpty star iconEmpty star icon1
This book is so poorly written, it is nearly impossible to understand.
Amazon Verified reviewAmazon

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About the author

Profile icon Sharma
Sharma
Vikash Sharma is a software developer and open source technology evangelist. He tries to keep things simple, which helps him write clean and manageable code. He has invested a large amount of time learning and implementing Scala code, and he has authored video courses for Scala. He works as a developer at SAP Labs.
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For example:

  • If you live inMexico, and the declared value of your ordered items is over $ 50, for you to receive a package, you will have to pay additional import tax of 19% which will be $ 9.50 to the courier service.
  • Whereas if you live inTurkey, and the declared value of your ordered items is over € 22, for you to receive a package, you will have to pay additional import tax of 18% which will be € 3.96 to the courier service.
How can I cancel my order?Chevron down iconChevron up icon

Cancellation Policy for Published Printed Books:

You can cancel any order within 1 hour of placing the order. Simply contact customercare@packt.com with your order details or payment transaction id. If your order has already started the shipment process, we will do our best to stop it. However, if it is already on the way to you then when you receive it, you can contact us at customercare@packt.com using the returns and refund process.

Please understand that Packt Publishing cannot provide refunds or cancel any order except for the cases described in our Return Policy (i.e. Packt Publishing agrees to replace your printed book because it arrives damaged or material defect in book), Packt Publishing will not accept returns.

What is your returns and refunds policy?Chevron down iconChevron up icon

Return Policy:

We want you to be happy with your purchase from Packtpub.com. We will not hassle you with returning print books to us. If the print book you receive from us is incorrect, damaged, doesn't work or is unacceptably late, please contact Customer Relations Team on customercare@packt.com with the order number and issue details as explained below:

  1. If you ordered (eBook, Video or Print Book) incorrectly or accidentally, please contact Customer Relations Team on customercare@packt.com within one hour of placing the order and we will replace/refund you the item cost.
  2. Sadly, if your eBook or Video file is faulty or a fault occurs during the eBook or Video being made available to you, i.e. during download then you should contact Customer Relations Team within 14 days of purchase on customercare@packt.com who will be able to resolve this issue for you.
  3. You will have a choice of replacement or refund of the problem items.(damaged, defective or incorrect)
  4. Once Customer Care Team confirms that you will be refunded, you should receive the refund within 10 to 12 working days.
  5. If you are only requesting a refund of one book from a multiple order, then we will refund you the appropriate single item.
  6. Where the items were shipped under a free shipping offer, there will be no shipping costs to refund.

On the off chance your printed book arrives damaged, with book material defect, contact our Customer Relation Team on customercare@packt.com within 14 days of receipt of the book with appropriate evidence of damage and we will work with you to secure a replacement copy, if necessary. Please note that each printed book you order from us is individually made by Packt's professional book-printing partner which is on a print-on-demand basis.

What tax is charged?Chevron down iconChevron up icon

Currently, no tax is charged on the purchase of any print book (subject to change based on the laws and regulations). A localized VAT fee is charged only to our European and UK customers on eBooks, Video and subscriptions that they buy. GST is charged to Indian customers for eBooks and video purchases.

What payment methods can I use?Chevron down iconChevron up icon

You can pay with the following card types:

  1. Visa Debit
  2. Visa Credit
  3. MasterCard
  4. PayPal
What is the delivery time and cost of print books?Chevron down iconChevron up icon

Shipping Details

USA:

'

Economy: Delivery to most addresses in the US within 10-15 business days

Premium: Trackable Delivery to most addresses in the US within 3-8 business days

UK:

Economy: Delivery to most addresses in the U.K. within 7-9 business days.
Shipments are not trackable

Premium: Trackable delivery to most addresses in the U.K. within 3-4 business days!
Add one extra business day for deliveries to Northern Ireland and Scottish Highlands and islands

EU:

Premium: Trackable delivery to most EU destinations within 4-9 business days.

Australia:

Economy: Can deliver to P. O. Boxes and private residences.
Trackable service with delivery to addresses in Australia only.
Delivery time ranges from 7-9 business days for VIC and 8-10 business days for Interstate metro
Delivery time is up to 15 business days for remote areas of WA, NT & QLD.

Premium: Delivery to addresses in Australia only
Trackable delivery to most P. O. Boxes and private residences in Australia within 4-5 days based on the distance to a destination following dispatch.

India:

Premium:Delivery to most Indian addresses within 5-6 business days

Rest of the World:

Premium: Countries in the American continent: Trackable delivery to most countries within 4-7 business days

Asia:

Premium: Delivery to most Asian addresses within 5-9 business days

Disclaimer:
All orders received before 5 PM U.K time would start printing from the next business day. So the estimated delivery times start from the next day as well. Orders received after 5 PM U.K time (in our internal systems) on a business day or anytime on the weekend will begin printing the second to next business day. For example, an order placed at 11 AM today will begin printing tomorrow, whereas an order placed at 9 PM tonight will begin printing the day after tomorrow.


Unfortunately, due to several restrictions, we are unable to ship to the following countries:

  1. Afghanistan
  2. American Samoa
  3. Belarus
  4. Brunei Darussalam
  5. Central African Republic
  6. The Democratic Republic of Congo
  7. Eritrea
  8. Guinea-bissau
  9. Iran
  10. Lebanon
  11. Libiya Arab Jamahriya
  12. Somalia
  13. Sudan
  14. Russian Federation
  15. Syrian Arab Republic
  16. Ukraine
  17. Venezuela

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