Scala from Scratch: Understanding
Scala from Scratch: Understanding
About the Book
Scala from Scratch: Understanding is the second in a series of two books that teach you the Scala programming language. Readers that have read Scala from Scratch: Exploration or have learned some Scala through other means will get a deeper understanding of the language features and underlying functional programming concepts that have been explored in the first book. You will also learn about important advanced language features that play a crucial role in many real-life Scala projects. While doing so, you'll get to know best practices that have been established over the years. By the end of the book, you will have a grasp of the language, its idioms, and common tools and techniques, allowing you to be a productive member in commercial or open-source Scala projects.
In this book you will learn more about algebraic data types and about pattern matching, and you will get insights into functional ways of error handling. You will learn about essential ideas of functional programming like currying and partial functional application. You will also explore advanced aspects of the Scala type system like covariance and contravariance, and how to employ the type class pattern when abstracting over concrete types. You will learn about the design of Scala's collections API and how to work with Scala collections effectively. You will get a good grasp of property-based testing, an alternative to example-based testing, and you will dive deeper into sbt, the standard build tool in the Scala ecosystem. You will also learn how to interact with the outside world in a purely functional way, and about different approaches at concurrent programming in Scala.
Some of the content in this book is based on The Neophyte's Guide to Scala. However, it has been heavily revised, and amended with a lot of new content. In some ways, you can think of it as a second, extended edition of that book — structured and written so that it builds on what readers have learned in Scala from Scratch: Exploration.
If you're a member of a marginalised community and/or 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 is currently 1 community copies available. Use this link to claim your free community copy of the book. If the coupon doesn't work, all copies have been claimed, and I haven't been able to update this page yet. There is no way for me to automate the process, unfortunately.
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.
If you like the book, I would be very grateful if you could post a review on your blog or on the book's Goodreads page.
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.
Freelance Illustrator and Designer
1. Algebraic data types
- 1.1 Sum types
- 1.2 Product types
- 1.3 Combining sum types and product types
- 1.4 Revisiting the guessing game
- 1.5 A definition of algebraic data types
- 1.6 Summary
2. The price of subtyping
- 2.1 Upper type bounds
- 2.2 Covariance
- 2.3 Contravariance
- 2.4 Demystifying covariant and contravariant positions
- 2.5 Invariance
- 2.6 Lower type bounds
- 2.7 Summary
3. Pattern matching in depth
- 3.1 Patterns everywhere
- 3.2 Pattern matching anonymous functions
- 3.3 Extractors
- 3.4 Summary
4. Functional error handling
- 4.1 Just give it a Try
- 4.2 Either this or that
- 4.3 Summary
5. Embracing functions
- 5.1 Higher-order functions
- 5.2 Partially applied functions
- 5.3 Currying
- 5.4 Summary
6. Type classes
- 6.1 A gentle approach to type classes
- 6.2 Implicit resolution
- 6.3 Type class usability
- 6.4 Higher-kinded types
- 6.5 Type classes in the standard library
- 6.6 Summary
7. The Scala collections library
- 7.1 A travel guide
- 7.2 Common collection tasks
- 7.3 A tale of two dichotomies
- 7.4 Choosing a collection type
- 7.5 Summary
8. Concurrency and asynchronous programming
- 8.1 Welcome to the Future
- 8.2 Futures in the real world
- 8.3 The trouble with Future
- 8.4 Summary
9. Property-based testing
- 9.1 From examples to properties
- 9.2 Property-based testing as a design tool
- 9.3 The good property
- 9.4 Summary
- 10.1 Summary
- 10.2 Where to go from here
- 10.3 And what about Scala 3?
Appendix: An sbt primer
- The minimal viable project
- Setting expressions
- Build definitions
- Setting dependencies
- Task expressions
- An introduction to scopes
- Library dependencies
- Custom setting and task keys
- sbt plugins
The Leanpub 45-day 100% Happiness Guarantee
Within 45 days of purchase you can get a 100% refund on any Leanpub purchase, in two clicks.
See full terms
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.
Algebra-Driven DesignSandy Maguire
A how-to field guide on building leak-free abstractions and algebraically designing real-world applications.
Production HaskellMatt Parsons
Are you excited about Haskell, but don't know where to begin? Are you thrilled by the technical advantages, but worried about the unknown pitfalls? This book has you covered.
Ansible for DevOpsJeff Geerling
Ansible is a simple, but powerful, server and configuration management tool. Learn to use Ansible effectively, whether you manage one server—or thousands.
The Hundred-Page Machine Learning BookAndriy Burkov
Everything you really need to know in Machine Learning in a hundred pages.
Machine Learning EngineeringAndriy Burkov
"If you intend to use machine learning to solve business problems at scale, I'm delighted you got your hands on this book."
—Cassie Kozyrkov, Chief Decision Scientist at Google
"Foundational work about the reality of building machine learning models in production."
—Karolis Urbonas, Head of Machine Learning and Science at Amazon
Cloud StrategyGregor Hohpe
While most enterprises are moving to the cloud these days, many initiatives are driven by wishes or promises rather than a sound strategy. Harvested from half a decade of cloud migrations, this book shares frameworks, strategies, and anecdotes for a structured and decision-centric path to cloud success.
OpenIntro StatisticsDavid Diez, Christopher Barr, Mine Cetinkaya-Rundel, and OpenIntro
A 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.
CCIE Service Provider Version 4 Written and Lab Exam Comprehensive GuideNicholas Russo
The service provider landscape has changed rapidly over the past several years. Networking vendors are continuing to propose new standards, techniques, and procedures for overcoming new challenges while concurrently reducing costs and delivering new services. Cisco has recently updated the CCIE Service Provider track to reflect these changes; this book represents the author's personal journey in achieving that certification.
CCIE SP v4.1 - WorkbookŁukasz Bromirski, Piotr Jablonski, and Nicholas Russo
Are you striving to prepare to and pass CCIE SP lab exam? Take the opportunity and get this workbook! With the attached initial cfg files you will prepare yourself for the CCIE SP exam as well as learn SP technologies applicable to all kinds of today modern networks! This workbook covers blueprint topics and provides challenging examples.
Sockets and PipesType Classes
Sockets and Pipes is not an introduction to Haskell; it is an introduction to writing software in Haskell. Using a handful of everyday Haskell libraries, this book walks through reading the HTTP specification and implementing it to create a web server.
The Node.js Bundle
3 BooksThis bundle combines three bestselling Leanpub Node.js books into a package that gives you everything you need to get started with developing Node.js applications at an unbeatable price.
The Tester's Library
8 BooksThe Tester's Library consists of eight five-star books that every software tester should read and re-read. As bound books, this collection would cost over $200. Even as e-books, their price would exceed $80, but in this bundle, their cost is only $49.99. Here are the books, and why they should be in your library: Perfect Software and Other...
11 BooksIn this bundle, you will find 10 different agile books. They are about different aspects of being agile. - finding a job - doing coding dojo's - Retrospectives - Personal kanban - a non-typical coaching book and even a book that gives you an insight in the lives of some agile people.
WTFlop 6M + HU - Beta Bundle
Fifty Quick Ideas
3 BooksGet all three books for the price of two! Fifty Quick Ideas books are full of practical, real-world techniques that you can use to improve teamwork, build better products and build them in a better way.
Growing Agile: Coach's Guide Series
4 BooksThis bundle provides a collection of training and workshop plans for a variety of agile topics. The series is aimed at agile coaches, trainers and ScrumMasters who often find themselves needing to help teams understand agile concepts. Each book in the series provides the plans, slides, handouts and activity instructions to run a number of...
Marionette.js A to Z
Complete Scala Bundle
3 BooksScala is a general-purpose programming language and it's getting extremely popular these days. Some say that learning Scala could be a challenging task. My experience, however, suggests that this is actually a myth that has very little to do with reality. With the right approach, learning Scala can be easy, fun and rewarding.The first book from...
Build A Better Backbone App
3 BooksThe best way to learn new development skills is through experience, but that takes time you don't have.Get the best of both worlds with this bundle: you'll learn how to produce modern web applications by learning from experienced developers like Derick Bailey and David Sulc. BackboneJS is one of the favorite tools on the web today, but it...