Alvin Alexander - Scala Cookbook: Recipes for Object-Oriented and Functional Programming
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by Alvin Alexander
Copyright 2021 Alvin Alexander. All rights reserved.
Printed in the United States of America.
Published by OReilly Media, Inc. , 1005 Gravenstein Highway North, Sebastopol, CA 95472.
OReilly books may be purchased for educational, business, or sales promotional use. Online editions are also available for most titles (http://oreilly.com). For more information, contact our corporate/institutional sales department: 800-998-9938 or corporate@oreilly.com .
- Acquisitions Editor: Suzanne McQuade
- Development Editor: Jeff Bleiel
- Production Editor: Christopher Faucher
- Copyeditor: JM Olejarz
- Proofreader: Athena Lakri
- Indexer: Potomac Indexing, LLC
- Interior Designer: David Futato
- Cover Designer: Karen Montgomery
- Illustrator: Kate Dullea
- August 2013: First Edition
- August 2021: Second Edition
- 2021-08-09: First Release
See http://oreilly.com/catalog/errata.csp?isbn=9781492051541 for release details.
The OReilly logo is a registered trademark of OReilly Media, Inc. Scala Cookbook, the cover image, and related trade dress are trademarks of OReilly Media, Inc.
The views expressed in this work are those of the author, and do not represent the publishers views. While the publisher and the author have used good faith efforts to ensure that the information and instructions contained in this work are accurate, the publisher and the author disclaim all responsibility for errors or omissions, including without limitation responsibility for damages resulting from the use of or reliance on this work. Use of the information and instructions contained in this work is at your own risk. If any code samples or other technology this work contains or describes is subject to open source licenses or the intellectual property rights of others, it is your responsibility to ensure that your use thereof complies with such licenses and/or rights.
978-1-492-05154-1
[LSI]
To the Kirn family of Louisville, Kentucky. As in the movie, While You Were Sleeping, I adopted them a long time ago, and my life has never been the same.
And also to my friends who passed away during the creation of this book: Frank, Ben, Kenny, Bill, and Lori.
This is a cookbook of problem-solving recipes about Scala 3, the most interesting programming language Ive ever used. The book contains solutions to more than two hundred fifty common Scala programming problems, demonstrated with more than one thousand examples.
Compared to other Scala 3 learning resources, there are several unique things about this book:
As a cookbook, its intended to save you time by providing solutions to the most common problems youll encounter.
The book covers not only the Scala language but also recipes on Scala tools and libraries, including sbt, Spark, Scala.js, Akka actors, and JSON processing with the Play Framework.
The book takes a big dive into the Scala collections classes, using five chapters to demonstrate their use.
Output from the examples is shown either in the Scala interpreter or in comments after the code. As a result, whether youre sitting by a computer, on a plane, or reading in your favorite recliner, you get the benefit of seeing their exact output. (Which often leads to, Ah, so thats how that works.)
In the first edition of Scala Cookbook, I described Scala 2 as feeling like a combination of Ruby and Java. Back then I wrote, My (oversimplified) Scala elevator pitch is that its a child of Ruby and Java: its light, concise, and readable like Ruby, but it compiles to class files that you package as JAR files that run on the Java virtual machine (JVM); it uses traits and mixins, and feels dynamic, but its statically typed.
Since then, the Scala language features have been rethought and debated in an open, public process, and with the release of Scala 3 in 2021, the language feels even lighter, and now it seems like a combination of four terrific languages: Ruby and Java, combined with the lightweight and clean syntax of Python and Haskell.
Part of this even-lighter feel is thanks to the new optional braces syntax, which is also known as a significant indentation style. With this one change, for loops that used to look like this:
for(i<-1to5){println(i)}now look like this:
fori<-1to5doprintln(i)Similarly, if expressions and many other expressions also use less boilerplate syntax and are easier to read:
valy=if(x==1){true}else{false}// Scala 2valy=ifx==1thentrueelsefalse// Scala 3While this new syntax is considered optional, its become the de facto standard and is used in this book, the Scala 3 Book that I cowrote for the Scala documentation website, the official Scala 3 training classes on Coursera, the books Programming in Scala by Martin Odersky et al. (Artima Press) and Programming Scala by Dean Wampler (OReilly), and many more learning resources.
The new syntax isnt the only change. Scala 3 has many new features, including:
Enumerations
Union and intersection types
Top-level definitions (so your code no longer has to be contained inside classes, traits, and objects)
Simplified use of implicits with the new
givenandusingsyntaxGreatly simplified syntax for extension methods and type classes
Even the syntax of traits and classes has been simplified to be more readable than ever before:
traitAnimal:defspeak():UnittraitHasTail:defwagTail():UnitclassDogextendsAnimal,HasTail:defspeak()=println("Woof")defwagTail()=println(" ")With the new syntax, every construct that creates unnecessary noise in your code has been removed.
In addition to everything just stated, Scala provides a multitude of features that make it a unique and truly modern programming language:
Its created by Martin Oderskythe father of
javacand influenced by Java, Ruby, Smalltalk, ML, Haskell, Python, Erlang, and others.
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