Scala is a multi-style programming language for the JVM that supports both object-oriented and functional programming. Master Scala, and you'll be well-equipped to match your programming approach to the type of problem you're dealing with. Packed with examples and exercises, Get Programming with Scala is perfect starting point for developers with some OO knowledge who want to learn Scala and pick up a few FP skills along the way.

Unit 0: Hello Scala!

Lesson 1: Why Scala?

1.1 Scala and the JVM

1.2 Scala’s key features

1.3 Advantages of adopting Scala

1.4 Summary

Lesson 2: Scala — The REPL

2.1 The REPL Commands

2.2 The REPL Code Evaluation

2.3 Summary

Lesson 3: SBT — Scala Build Tool

3.1 SBT Commands

3.2 Your first SBT Project

3.3 SBT Project Structure

3.4 Summary

Unit 1: Statements, Expressions, and Values

Lesson 4: Values and Variables

4.1 Values

4.2 Variables

4.3 Lazy Values

4.4 Summary

4.5 Answers to quick checks

Lesson 5: Conditional Statements

5.1 If…else statement

5.2 Pattern matching

5.3 Summary

5.4 Answers to quick checks

Lesson 6: Import and Packages

6.1 Import an existing Package

6.2 Create a Package

6.3 Create a Package Object

6.4 Summary

6.5 Answers to Quick Checks

Lesson 7: Access Modifiers

7.1 Default Access Modifier

7.2 Private

7.3 Protected

7.4 Package private

7.5 Which Access Modifier to use?

7.6 Summary

7.7 Answers to Quick Checks

Lesson 8: Let’s build a vending machine!

8.1 The Vending Machine: customer flow

8.1.1 The VendingMachine class and its APIs

8.1.2 The Vending Machine and its operations

8.2 The Vending Machine: operator flow

8.2.1 The Operator class and its APIs

8.2.2 The Operator: collecting Money and adding products

8.2.3 Let’s try it out

8.3 The ugly bits of our solution

8.4 Summary

Unit 2: Structure your Code

Lesson 9: Classes and Subclasses to represent the world

9.1 Class

9.2 Subclass

9.3 Abstract class

9.4 Anonymous Class

9.5 Summary

9.6 Answers to Quick Checks

Lesson 10: Objects are important too!

10.1 Object

10.1.1 Object as executable program

10.2 Companion Object

10.2.1 The Apply Method

10.3 Summary

10.4 Answers to Quick Checks

Lesson 11: Traits as composable blocks of code

11.1 Fragments of code on steroids

11.2 Trait versus Abstract Class

11.3 Seal traits

11.4 Summary

11.5 Answers to Quick Checks

Lesson 12: Case Classes to structure your data

12.1 Case class

12.2 Case object

12.3 Tuples

12.4 Summary

12.5 Answers to Quick Checks

Lesson 13: Rock, Paper, Scissors, Lizard, Spock!

13.1 Implementing Rock, Paper, Scissor, Lizard, Spock!

13.1.1 What’s a symbol?

13.1.2 Defining each symbol

13.1.3 The Game representation

13.1.4 Let’s give it a try

13.2 Summary

Unit 3: Functions

Lesson 14: Function as the most fundamental block of code

Lesson 15: Pure and Impure Functions

Lesson 16: Anonymous Functions

Lesson 17: High Order Functions

Lesson 18: Capstone 3: Travelling across Europe

Unit 4: Collections

Lesson 19: Immutable and Mutable collections

Lesson 20: Working with List

Lesson 21: Working with Map

Lesson 22: Common operations on collections

Lesson 23: Capstone 4: Hotel Management Service

Unit 5: Common types

Lesson 24: Option a way to represent nullable data

Lesson 25: Either one or the other

Lesson 26: Try an operation that can fail

Lesson 27: Future an operation that takes time

Lesson 28: Capstone 5

Unit 6: Even more functions

Lesson 29: Recursive Functions

Lesson 30: Partial Functions

Lesson 31: Curry and Closures

Lesson 32: Function composition

Lesson 33: Capstone 6

Unit 7: Abstractions never repeat yourself

Lesson 34: Generics hide details that do not matter

Lesson 35: Bound your types

Lesson 36: Type aliases

Lesson 37: Higher Kinded Types

Lesson 38: Capstone 7

Unit 8: Make your code maintainable

Lesson 39: Testing

Lesson 40: Property-base testing

Lesson 41: Write code that looks nice

Lesson 42: Do only one things, do it right

Lesson 43: Capstone 8

Unit 9: Scala tricks that make your life easier

Lesson 44: Data validation

Lesson 45: More on For-comprehensions

Lesson 46: Pimp your library

Lesson 47: Type Classes

Lesson 48: Capstone 10

About the Technology

Although it's a relative newcomer, Scala turned out to be the right language at the right time, opening up the world of functional programming to the JVM. Scala looks a lot like Java, and it interacts seamlessly with familiar Java libraries and tools. Since it fully supports functional programming, Scala gives you the freedom to choose the right programming style exactly when it benefits you. Scala can be daunting at first, especially if you're seeing FP ideas for the first time. Fortunately, with the examples and exercises in this book, you'll get over the initial learning hump quickly and start doing interesting projects before you know it!

About the book

Get Programming with Scala teaches you the core skills you'll need to code with Scala. This book lives up to its name! You'll learn the ins and outs of Scala by actually programming with it, thanks to the practical examples, exercises, and easy-to-follow lessons. You'll start by reviewing OOP concepts in the Scala language. Then, example-by-example, you'll gradually open up the world of functional programming. You'll explore functions and types and learn how to combine them to create powerful, flexible abstractions. Along the way, you'll learn some Scala testing and get an intuition for sniffing out and fixing code that doesn't smell quite right.

What's inside

Learn to express OO principles in Scala
Express your program designs in functions
Make use of types to enforce program requirements
Use abstractions to avoid code duplication
Write meaningful tests and recognize code smells

About the reader

Written for developers with some prior experience in an OOP language like Java or C#. No experience with Scala or functional programming is needed.

About the author

Daniela Sfregola started working with Scala in 2013. Since then she has been an active contributor to the Scala Community. Daniela currently maintains several open source projects in the community and regularly speaks at Scala conferences. She blogs about Scala regularly at https://danielasfregola.com/.

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