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Layka

Pollak

US $49.99

Shelve in

Programming Languages /Java

User level:

Beginning–Intermediate

www.apress.com

SOURCE CODE ONLINE

BOOKS FOR PROFESSIONALS BY PROFESSIONALS

Beginning Scala

Beginning Scala, Second Edition takes a down-to-earth approach to teaching

Scala that leads you through simple examples that can be combined to build

complex, scalable systems and applications.

This book introduces you to the Scala programming language, its object-oriented

and functional programming characteristics, and then guides you through Scala

constructs and libraries that allow you to assemble small components into

high-performance, scalable systems. You will learn why Scala is judiciously used

for critical business applications by leading companies such as Twitter, LinkedIn,

Foursquare, the Guardian, Morgan Stanley, Credit Suisse, UBS, and HSBC.

Scala is a multi-paradigm programming language that combines both functional

and object-oriented features. Moreover, this highly scalable language lends

itself well to building cloud-based/deliverable Software as a Service (SaaS) online

applications.

• Understand the basic syntax and mechanisms for writing Scala programs

• Learn the object-oriented features of Scala

• Use Scala’s functional programming features to define and

manage concurrency

• Build parsers using Scala’s library of parser combinators

• Create and manipulate XML content using Scala

• Take advantage of Scala’s standard annotations and even create your own

• Integrate and reuse an existing Java codebase

• Build projects that contain both Scala and Java code and dependencies

• Use Scala libraries and Scala web frameworks such as Play 2 to build

web applications with Scala

SECOND

EDITION

9781484 202333

54999

ISBN 978-1-4842-0233-3

iii

Contents at a Glance

About the Authors �� xiii

About the Technical Reviewer ��xv

Introduction ��xvii

Chapter 1: Getting Started with Scala ■ �� 1

Chapter 2: Basics of Scala ■ �� 13

Chapter 3: Object Orientation in Scala ■ �� 33

Chapter 4: Functional Programming in Scala ■ �� 57

Chapter 5: Pattern Matching ■ �� 73

Chapter 6: Scala Collections ■ �� 91

Chapter 7: Traits ■ �� 121

Chapter 8: Scala Type System ■ �� 133

Chapter 9: Scala and Java Interoperability ■ �� 153

Chapter 10: DSL and Parser Combinator ■ �� 165

Chapter 11: Simple Build Tool - SBT ■ �� 179

Chapter 12: Scala for Web Application ■ �� 191

Chapter 13: Scala Best Practices ■ �� 219

Index �� 235

xvii

Introduction

Ouch! at hurts my brain! Stop making me think dierently. Oh, wait . . . it hurts less now. I get it. is

dierent way of solving the problem has some benets. I felt that way after my rst year of law school. I felt

that way for a while when I began coding Scala. What’s this Option thingy? Give me back my null! How do

you get the fth element from a Seq? On and on it went. Day after day of head-splitting paradigm changing

and breaking 30 years of coding habits, I am somewhat at peace with the Scala way of coding. Yes, my coding

habits were borne out of 6800 machine code coding. Talk about imperative coding. at’s all you’ve got when

you’ve got an accumulator, a program counter, and an index register. I grew up through BASIC, Pascal, C,

C++, Objective-C, and Java. And along comes this Scala stu, this functional-objective way of thinking,

these compositional design patterns. Who thought up this wacky stu?

After more than two years of coding Scala, I’ve come to understand that the Scala idioms are really

better. My brain has nally stopped hurting. I’ve nally stopped ghting for ow of control statements. I see

that it’s more important for me to take small elements and compose them together into complex systems.

I understand that if a method always returns the same output given the same input, I can safely glue that

function together with other functions into a very complex structure. I understand that explicit looping in my

code is a distraction from the business logic that is buried in the code. My path was hard, and I hope yours

will be easier.

e rst step in writing Scala is not being afraid of the fact that Scala’s going to warp your brain. e next

step in writing Scala is accepting that your code is going to look like Java, Ruby, Python, whatever code for a

while. It will take you time and eort and more time to code Scala using the idioms in this book. It will take

you time to design code that ts into Scala paradigms and to discover and devise paradigms of your own.

It will take time but hopefully less time than it took me.

is book is for you. It’s my attempt to show you a dierent way of thinking about and writing code.

I hope that you’ll enjoy our journey through Scala together. I hope that by the end of this book you’ll have a

new perspective on coding. I hope that you’ll be writing better code and fewer lines of code yet are happier

about the code that you’re writing. So, come along. Stick that little toe in the Scala waters and see if they feel

as good for you as they have for me.

Who This Book Is For

is book is for folks with some programming background who want to dip their little toe into Scala, check

the temperature, and perhaps wade in some more.

How This Book Is Structured

Chapters 1 through 3 are meant to give you a basic grounding in Scala syntax and Scala idioms.

Chapters 4 through 7 tour key Scala features, including functions, pattern matching, Scala Collections and

traits. Chapter 8 is a deep dive into Scala’s type system. Chapter 9 discusses Scala and Java interoperability.

Chapter 10 rolls the pieces together with an exploration of DSLs and Scala’s parser combinator library.

Chapter 11 discusses the standard build tool SBT. Chapter 12 shows how to develop web applications using

Scala web framework. Chapter 13 discusses some best practices for Scala.

剩余245页未读，继续阅读

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Joel.Wang老王

2015-07-19

这真的是入门scala的好书，可以以这本书快速入门。

gemire

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