Scala from Scratch: Exploration
Scala from Scratch: Exploration
About the Book
Scala from Scratch: Exploration is the first in a series of two books that teach you the Scala programming language. Readers that have some experience with an object-oriented or imperative language, like Java, Ruby, or Python, will get a comprehensive overview of what Scala brings to the table. The goal is to get you excited about Scala and give you a strong foundation for writing your first applications and continuing your journey. By the end of the book, you will have a good idea of what it's like to work with Scala, and you will have written a small, but complete command-line application based on a Functional Core, Imperative Shell architecture.
In this book you will learn about functional and object-oriented aspects of Scala. You will learn how to write expressive, intent-revealing code using pattern matching, functional sequence processing and for comprehensions, and how to design data types that enforce their business invariants in a functional way, without throwing exceptions. You will get a first glimpse at Scala's powerful type system and how to abstract over concrete types, and you will learn all there is to know about working with Option, Scala's approach at avoiding the million dollar mistake of null references.
If you are excited and want to continue your journey, you will be able to do with the upcoming second book in the series, Scala from Scratch: Understanding, which will go even deeper into the topics explored in this book and will discuss advanced language features and patterns.
Community Copies
If you're a member of a marginalised community and can't afford to buy this book, feel free to claim one of the free community copies. Copies are limited, but I will add more whenever someone donates one.
There in currently 1 community copy available.
Donating a copy
If you would like to support members of a marginalised community who can't afford the book, please consider donating a community copy by choosing the Donate a Community copy package.
Reviews
Have you read the book? I would be very grateful for reviews and ratings at the book's Goodreads page.
About the Author
Packages
The Book
PDF
EPUB
MOBI
WEB
English
Donate a Community Copy
Get the ebook and donate a free community copy. This can then be claimed by a member of a marginalised community who can currently not afford purchasing a copy of this book or someone who cannot pay for this book for other reasons.
PDF
EPUB
MOBI
WEB
English
Bundles that include this book
About the Contributors
Freelance Illustrator and Designer
Ann-Marie is responsible for the cover illustration. She is a freelance illustrator and designer from Hamburg, Germany.
She regularly posts some of her artwork as illumarie_art on Instagram.
Table of Contents
- Credits
- Preface
-
1. With a REPL yell
- 1.1 What’s a REPL?
- 1.2 Install fest
- 1.3 Doing the math
- 1.4 Greetings from Mr. Boole
- 1.5 Values and variables
- 1.6 The thin line between compile time and runtime
- 1.7 Local type inference
- 1.8 Calling methods
- 1.9 Summary
-
2. Scala, the functional language
- 2.1 The purely functional way
- 2.2 More about writing functions
- 2.3 If-expressions
- 2.4 Functions as values
- 2.5 Escaping the loop
- 2.6 Summary
-
3. Scala, the object-oriented language
- 3.1 Classes and objects
- 3.2 Singleton objects
- 3.3 Visibility modifiers
- 3.4 Traits
- 3.5 Everything is an object
- 3.6 Am I equal? Yes I am!
- 3.7 Summary
-
4. Scala, the expressive language
- 4.1 Named and default arguments
- 4.2 A first glance at pattern matching
- 4.3 Case classes
- 4.4 Tuples
- 4.5 Processing sequences, the functional way
- 4.6 More sugar with for comprehensions
- 4.7 Type aliases
- 4.8 No strings attached
- 4.9 Summary
-
5. Tools for modular code
- 5.1 Inner classes, objects, and traits
- 5.2 Packages
- 5.3 Imports
- 5.4 Package-level visibility modifiers
- 5.5 Package objects
- 5.6 Summary
-
6. Bringing value to your classes
- 6.1 Value classes
- 6.2 Extension methods
- 6.3 Summary
-
7. Scala type system 101
- 7.1 Type constructors
- 7.2 Polymorphic methods
- 7.3 Polymorphic extension methods
- 7.4 Summary
-
8. The strict brown fox jumps over the lazy dog
- 8.1 By-name parameters
- 8.2 Lazy values
- 8.3 Summary
-
9. Know your options
- 9.1 The basic idea
- 9.2 Creating an option
- 9.3 Working with optional values
- 9.4 Options are collections
- 9.5 For comprehensions
- 9.6 Chaining options
- 9.7 Purely functional data types
- 9.8 Option in the standard library
- 9.9 Summary
-
10. Putting it all together
- 10.1 Talking to the product owner
- 10.2 Architectural decisions
- 10.3 Setting up the project
- 10.4 The functional core
- 10.5 The imperative shell
- 10.6 Packaging the application
- 10.7 Summary
-
11. Downtime
- 11.1 Summary
- 11.2 The road ahead
- 11.3 Taking action
- Notes
The Leanpub 60-day 100% Happiness Guarantee
Within 60 days of purchase you can get a 100% refund on any Leanpub purchase, in two clicks.
See full terms
Do Well. Do Good.
Authors have earned$11,238,437writing, publishing and selling on Leanpub, earning 80% royalties while saving up to 25 million pounds of CO2 and up to 46,000 trees.
Learn more about writing on Leanpub
Free Updates. DRM Free.
If you buy a Leanpub book, you get free updates for as long as the author updates the book! Many authors use Leanpub to publish their books in-progress, while they are writing them. All readers get free updates, regardless of when they bought the book or how much they paid (including free).
Most Leanpub books are available in PDF (for computers), EPUB (for phones and tablets) and MOBI (for Kindle). The formats that a book includes are shown at the top right corner of this page.
Finally, Leanpub books don't have any DRM copy-protection nonsense, so you can easily read them on any supported device.
Learn more about Leanpub's ebook formats and where to read them
Top Books
- #1
OpenIntro Statistics
David Diez, Christopher Barr, Mine Cetinkaya-Rundel, and OpenIntroA complete foundation for Statistics, also serving as a foundation for Data Science.
Leanpub revenue supports OpenIntro (US-based nonprofit) so we can provide free desk copies to teachers interested in using OpenIntro Statistics in the classroom and expand the project to support free textbooks in other subjects.
More resources: openintro.org.
- #2
Ansible for DevOps
Jeff GeerlingAnsible is a simple, but powerful, server and configuration management tool. Learn to use Ansible effectively, whether you manage one server—or thousands.
- #3
Everyday Rails - RSpecによるRailsテスト入門
Junichi Ito (伊藤淳一) and Aaron SumnerRSpecを使ってRailsアプリケーションに信頼性の高いテストを書く実践的なアドバイスを提供します。詳細で丁寧な説明は本書のオリジナルコンテンツです。また、説明には実際に動かせるサンプルアプリケーションも使用します。本書は2022年版にアップデートされ、Rails 7.0やRSpec Rails 5.0といった新しい環境に対応しています！さあ、自信をもってテストできるようになりましょう！
- #4
C++20 - The Complete Guide
Nicolai M. JosuttisAll the new language and library features of C++20 (for those who know previous versions).
The book presents all new language and library features of C++20. Learn how this impacts day-to-day programming, to benefit in practice, to combine new features, and to avoid all new traps.
Buy early, pay less, free updates.
Other books:
- #5
Concurrency with Modern C++
Rainer GrimmC++11 is the first C++ standard that deals with concurrency. The story goes on with C++17, C++20, and will continue with C++23.
I'll give you a detailed insight into the current and the upcoming concurrency in C++. This insight includes the theory and a lot of practice.
- #6
Jetpack Compose internals
Jorge CastilloJetpack Compose is the future of Android UI. Master how it works internally and become a more efficient developer with it. You'll also find it valuable if you are not an Android dev. This book provides all the details to understand how the Compose compiler & runtime work, and how to create a client library using them.
- #7
Stratospheric
Tom Hombergs, Björn Wilmsmann, and Philip RiecksFrom Zero to Production with Spring Boot and AWS. All you need to know to get a Spring Boot application into production with AWS. No previous AWS knowledge required.
Go to stratospheric.dev for a tour of the contents.
- #8
Atomic Kotlin
Bruce Eckel and Svetlana IsakovaFor both beginning and experienced programmers! From the author of the multi-award-winning Thinking in C++ and Thinking in Java and a Kotlin team member comes a book that breaks concepts into small, easy-to-digest "atoms," along with exercises supported by hints and solutions directly inside IntelliJ IDEA! Full support at www.AtomicKotlin.com.
- #9
Introducing EventStorming
Alberto BrandoliniThe deepest tutorial and explanation about EventStorming, straight from the inventor.
- #10
C++20
Rainer GrimmC++20 is the next big C++ standard after C++11. As C++11 did it, C++20 changes the way we program modern C++. This change is, in particular, due to the big four of C++20: ranges, coroutines, concepts, and modules.
Top Bundles
- #1
CCIE Service Provider Ultimate Study Bundle
2 Books
Piotr Jablonski, Lukasz Bromirski, and Nick Russo have joined forces to deliver the only CCIE Service Provider training resource you'll ever need. This bundle contains a detailed and challenging collection of workbook labs, plus an extensively detailed technical reference guide. All of us have earned the CCIE Service Provider certification... - #2
Software Architecture for Developers: Volumes 1 & 2 - Technical leadership and communication
2 Books
"Software Architecture for Developers" is a practical and pragmatic guide to modern, lightweight software architecture, specifically aimed at developers. You'll learn:The essence of software architecture.Why the software architecture role should include coding, coaching and collaboration.The things that you really need to think about before... - #4
Modern C++ Collection
3 Books
Get All about Modern C++C++ Standard Library, including C++20Concurrency with Modern C++, including C++20C++20Each book has about 200 complete code examples. Updates are included. When I update one of the books, you immediately get the updated bundle. You can expect significant updates to each new C++ standard (C++23, C++26, .. ) and also... - #7
Linux Administration Complet
4 Books
Ce lot comprend les quatre volumes du Guide Linux Administration :Linux Administration, Volume 1, Administration fondamentale : Guide pratique de préparation aux examens de certification LPIC 1, Linux Essentials, RHCSA et LFCS. Administration fondamentale. Introduction à Linux. Le Shell. Traitement du texte. Arborescence de fichiers. Sécurité...
