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E-raamat: Programming Scala

3.72/5 (233 hinnangut Goodreads-ist)

Wampler

Formaat: 556 pages
Ilmumisaeg: 26-May-2021
Kirjastus: O'Reilly Media
Keel: eng
ISBN-13: 9781492077848

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Formaat: 556 pages
Ilmumisaeg: 26-May-2021
Kirjastus: O'Reilly Media
Keel: eng
ISBN-13: 9781492077848

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Get up to speed on Scala--the JVM, JavaScript, and natively compiled language that offers all the benefits of functional programming, a modern object model, and an advanced type system. Packed with code examples, this comprehensive book shows you how to be productive with the language and ecosystem right away. You'll learn why Scala is ideal for today's highly scalable, data-centric applications that support concurrency and distribution.

Despite the reinvigoration of Java and the introduction of Kotlin, Scala hasn't been sitting still. This third edition covers the new features in Scala 3.0, with updates throughout the book. Programming Scala is ideal for beginning to advanced developers who want a complete understanding of Scala's design philosophy and features with a thoroughly practical focus.

Program faster with Scala's succinct and flexible syntax
Dive into basic and advanced functional programming (FP) techniques
Build killer big data and distributed apps, using Scala's functional combinators and tools including Akka and Spark
Use traits for mixin composition and pattern matching for data extraction
Learn the sophisticated type system that combines functional programming and object-oriented programming concepts

Foreword

xvii

Preface

xxi

1 Zero To Sixty: Introducing Scala

(30)

Why Scala?

(2)

The Appeal of Scala

(1)

Why Scala 3?

(1)

Migrating to Scala 3

(1)

Installing the Scala Tools You Need

(1)

Building the Code Examples

(1)

More Tips

(4)

Using sbt

(2)

Running the Scala Command-Line Tools Using sbt

(2)

A Taste of Scala

(11)

A Sample Application

(9)

Recap and What's Next

(2)

2 Type Less, Do More

(40)

New Scala

(28)

Syntax--Optional Braces

(2)

Semicolons

(1)

Variable Declarations

(2)

Ranges

(1)

Partial Functions

(3)

Method Declarations

(9)

Method Default and Named Parameters

(1)

Methods with Multiple Parameter Lists

(5)

Nesting Method Definitions and Recursion

(3)

Inferring Type Information

(1)

Repeated Parameter Lists

(2)

Language Keywords

(3)

Literal Values

(4)

Numeric Literals

(1)

Boolean Literals

(1)

Character Literals

(1)

String Literals

(2)

Symbol Literals

(1)

Function Literals

(1)

Tuples

(2)

Option, Some, and None: Avoiding Nulls

(2)

When You Really Can't Avoid Nulls

(1)

Sealed Class Hierarchies and Enumerations

(1)

Organizing Code in Files and Namespaces

(1)

Importing Types and Their Members

(2)

Package Imports and Package Objects

(1)

Parameterized Types Versus Abstract Type Members

(3)

Recap and What's Next

(2)

3 Rounding Out The Basics

(34)

Defining Operators

(5)

Allowed Characters in Identifiers

(1)

Methods with Empty Parameter Lists

(1)

Operator Precedence Rules

(1)

Enumerations and Algebraic Data Types

(3)

Interpolated Strings

(1)

Scala Conditional Expressions

(2)

Conditional and Comparison Operators

(1)

For Comprehensions

(4)

For Loops

(1)

Generators

(1)

Guards: Filtering Values

(1)

Yielding New Values

(1)

Expanded Scope and Value Definitions

(2)

Scala while Loops

(1)

Using try, catch, and finally Clauses

(4)

Call by Name, Call by Value

(3)

Lazy Values

(2)

Traits: Interfaces and Mixins in Scala

(3)

When new Is Optional

102

(1)

Recap and What's Next

103

(2)

4 Pattern Matching

105

(32)

Safer Pattern Matching with Matchable

105

(2)

Values, Variables, and Types in Matches

107

(4)

Matching on Sequences

111

(3)

Pattern Matching on Repeated Parameters

114

(1)

Matching on Tuples

114

(3)

Parameter Untupling

116

(1)

Guards in Case Clauses

117

(1)

Matching on Case Classes and Enums

117

(3)

Matching on Regular Expressions

120

(1)

Matching on Interpolated Strings

121

(1)

Sealed Hierarchies and Exhaustive Matches

121

(1)

Chaining Match Expressions

122

(1)

Pattern Matching Outside Match Expressions

122

(2)

Problems in Pattern Bindings

124

(1)

Pattern Matching as Filtering in for Comprehensions

125

(1)

Pattern Matching and Erasure

126

(1)

Extractors

127

(8)

Unapply Method

127

(2)

Alternatives to Option Return Values

129

(3)

Unapplyseq Method

132

(2)

Implementing unapplySeq

134

(1)

Recap and What's Next

135

(2)

5 Abstracting Over Context: Type Classes And Extension Methods

137

(28)

Four Changes

138

(1)

Extension Methods

139

(3)

Build Your Own String Interpolator

142

(1)

Type Classes

142

(12)

Scala 3 Type Classes

143

(7)

Alias Givens

150

(2)

Scala 2 Type Classes

152

(2)

Scala 3 Implicit Conversions

154

(4)

Type Class Derivation

158

(1)

Givens and Imports

159

(2)

Givens Scoping and Pattern Matching

161

(1)

Resolution Rules for Givens and Extension Methods

162

(1)

The Expression Problem

163

(1)

Recap and What's Next

163

(2)

6 Abstracting Over Context: Using Clauses

165

(20)

Using Clauses

165

(2)

Context Bounds

167

(4)

Other Context Parameters

171

(1)

Context Functions

172

(3)

Constraining Allowed Instances

175

(4)

Implicit Evidence

178

(1)

Working Around Type Erasure with Using Clauses

179

(1)

Rules for Using Clauses

180

(2)

Improving Error Messages

182

(1)

Recap and What's Next

183

(2)

7 Functional Programming In Scala

185

(40)

What Is Functional Programming?

185

(5)

Functions in Mathematics

186

(1)

Variables That Aren't

187

(3)

Functional Programming in Scala

190

(3)

Anonymous Functions, Lambdas, and Closures

190

(3)

Purity Inside Versus Outside

193

(1)

Recursion

193

(1)

Tail Calls and Tail-Call Optimization

194

(1)

Partially Applied Functions Versus Partial Functions

195

(1)

Currying and Uncurrying Functions

196

(1)

Tupled and Untupled Functions

197

(1)

Partial Functions Versus Functions Returning Options

198

(1)

Functional Data Structures

199

(5)

Sequences

200

(2)

Maps

202

(1)

Sets

203

(1)

Traversing, Mapping, Filtering, Folding, and Reducing

204

(15)

Traversing

204

(1)

Mapping

205

(1)

Flat Mapping

206

(2)

Filtering

208

(2)

Folding and Reducing

210

(5)

Left Versus Right Folding

215

(4)

Combinators: Software's Best Component Abstractions

219

(3)

What About Making Copies?

222

(2)

Recap and What's Next

224

(1)

8 For Comprehensions In Depth

225

(20)

Recap: The Elements of for Comprehensions

225

(2)

For Comprehensions: Under the Hood

227

(3)

Translation Rules of for Comprehensions

230

(2)

Options and Container Types

232

(11)

Option as a Container?

232

(4)

Either: An Alternative to Option

236

(3)

Try: When There Is No Do

239

(2)

Validated from the Cats Library

241

(2)

Recap and What's Next

243

(2)

9 Object-Oriented Programming In Scala

245

(26)

Class and Object Basics: Review

246

(1)

Open Versus Closed Types

247

(5)

Classes Open for Extension

250

(1)

Overriding Methods? The Template Method Pattern

251

(1)

Reference Versus Value Types

252

(1)

Opaque Types and Value Classes

253

(8)

Opaque Type Aliases

255

(3)

Value Classes

258

(3)

Supertypes

261

(1)

Constructors in Scala

262

(1)

Calling Supertype Constructors

263

(1)

Export Clauses

263

(2)

Good Object-Oriented Design: A Digression

265

(2)

Fields in Types

267

(3)

The Uniform Access Principle

268

(2)

Unary Methods

270

(1)

Recap and What's Next

270

(1)

10 Traits

271

(14)

Traits as Mixins

271

(4)

Stackable Traits

275

(4)

Union and Intersection Types

279

(2)

Transparent Traits

281

(1)

Using Commas Instead of with

282

(1)

Trait Parameters

282

(2)

Should That Type Be a Class or Trait?

284

(1)

Recap and What's Next

284

(1)

11 Variance Behavior And Equality

285

(16)

Parameterized Types: Variance Under Inheritance

285

(7)

Functions Under the Hood

286

(4)

Variance of Mutable Types

290

(2)

Improper Variance of Java Arrays

292

(1)

Equality of Instances

292

(3)

The equals Method

293

(1)

The == and != Methods

293

(1)

The eq and ne Methods

294

(1)

Array Equality and the sameElements Method

294

(1)

Equality and Inheritance

295

(1)

Multiversal Equality

296

(3)

Case Objects and hashCode

299

(1)

Recap and What's Next

300

(1)

12 Instance Initialization And Method Resolution

301

(10)

Linearization of a Type Hierarchy

301

(4)

Initializing Abstract Fields

305

(2)

Overriding Concrete Fields

307

(1)

Abstract Type Members and Concrete Type Aliases

308

(1)

Recap and What's Next

309

(2)

13 The Scala Type Hierarchy

311

(14)

Much Ado About Nothing (and Null)

312

(3)

The scala Package

315

(1)

Products, Case Classes, Tuples, and Functions

316

(3)

Tuples and the Tuple Trait

317

(2)

The Predef Object

319

(4)

Implicit Conversions

319

(2)

Type Definitions

321

(1)

Condition Checking Methods

321

(1)

Input and Output Methods

322

(1)

Miscellaneous Methods

323

(1)

Recap and What's Next

323

(2)

14 The Scala Collections Library

325

(16)

Different Groups of Collections

326

(1)

Abstractions with Multiple Implementations

326

(7)

The scala.collection.immutable Package

327

(2)

The scala.collection.mutable Package

329

(2)

The scalaxollection Package

331

(2)

The scala.collection.concurrent Package

333

(1)

The scalaxollection.convert Package

333

(1)

The scalaxollection.generic Package

333

(1)

Construction of Instances

333

(2)

The Iterable Abstraction

335

(1)

Polymorphic Methods

336

(1)

Equality for Collections

337

(1)

Nonstrict Collections: Views

338

(1)

Recap and What's Next

339

(2)

15 Visibility Rules

341

(6)

Public Visibility: The Default

342

(1)

Visibility Keywords

342

(1)

Protected Visibility

343

(1)

Private Visibility

343

(1)

Scoped Private and Protected Visibility

343

(2)

Recap and What's Next

345

(2)

16 Scala's Type System, Part 1

347

(22)

Parameterized Types

347

(1)

Abstract Type Members and Concrete Type Aliases

348

(1)

Comparing Abstract Type Members Versus Parameterized Types

348

(1)

Type Bounds

349

(3)

Upper Type Bounds

349

(1)

Lower Type Bounds

350

(2)

Context Bounds

352

(1)

View Bounds

352

(1)

Intersection and Union Types

353

(6)

Intersection Types

353

(3)

Union Types

356

(3)

Phantom Types

359

(3)

Structural Types

362

(5)

Refined Types

367

(1)

Existential Types (Obsolete)

367

(1)

Recap and What's Next

368

(1)

17 Scala's Type System, Part II

369

(28)

Match Types

369

(2)

Dependently Typed Methods

371

(2)

Dependent Method and Dependent Function Types

373

(1)

Dependent Typing

374

(6)

Path-Dependent Types

380

(2)

Using this

380

(1)

Using super

381

(1)

Stable Paths

381

(1)

Self-Type Declarations

382

(3)

Type Projections

385

(1)

More on Singleton Types

386

(1)

Self-Recursive Types: F-Bounded Polymorphism

387

(1)

Higher-Kinded Types

388

(3)

Type Lambdas

391

(2)

Polymorphic Functions

393

(1)

Type Wildcard Versus Placeholder

394

(1)

Recap and What's Next

395

(2)

18 Advanced Functional Programming

397

(14)

Algebraic Data Types

397

(3)

Sum Types Versus Product Types

397

(2)

Properties of Algebraic Data Types

399

(1)

Final Thoughts on Algebraic Data Types

400

(1)

Category Theory

400

(9)

What Is a Category?

401

(1)

Functor

402

(2)

The Monad Endofunctor

404

(4)

The Semigroup and Monoid Categories

408

(1)

Recap and What's Next

409

(2)

19 Tools For Concurrency

411

(18)

The scala.sys.process Package

411

(2)

Futures

413

(3)

Robust, Scalable Concurrency with Actors

416

(10)

Akka: Actors for Scala

417

(8)

Actors: Final Thoughts

425

(1)

Stream Processing

426

(1)

Recap and What's Next

427

(2)

20 Dynamic Invocation In Scala

429

(10)

Structural Types Revisited

429

(3)

A Motivating Example: ActiveRecord in Ruby on Rails

432

(1)

Dynamic Invocation with the Dynamic Trait

433

(4)

DSL Considerations

437

(1)

Recap and What's Next

437

(2)

21 Domain-Specific Languages In Scala

439

(12)

Internal DSLs

440

(6)

External DSLs with Parser Combinators

446

(3)

About Parser Combinators

447

(1)

A Payroll External DSL

447

(2)

Internal Versus External DSLs: Final Thoughts

449

(1)

Recap and What's Next

450

(1)

22 Scala Tools And Libraries

451

(16)

Scala 3 Versions

451

(1)

Command-Line Interface Tools

452

(5)

Coursier

453

(1)

Managing Java JDKs with Coursier

453

(1)

The scalac Command-Line Tool

454

(1)

The scala Command-Line Tool

455

(1)

The scaladoc Command-Line Tool

456

(1)

Other Scala Command-Line Tools

456

(1)

Build Tools

457

(1)

Integration with IDEs and Text Editors

457

(1)

Using Notebook Environments with Scala

457

(1)

Testing Tools

458

(1)

Scala for Big Data: Apache Spark

459

(2)

Typelevel Libraries

461

(1)

Li Haoyi Libraries

462

(1)

Java and Scala Interoperability

462

(3)

Using Java Identifiers in Scala Code

462

(1)

Scala Identifiers in Java Code

463

(1)

Java Generics and Scala Parameterized Types

463

(1)

Conversions Between Scala and Java Collections

464

(1)

Java Lambdas Versus Scala Functions

464

(1)

Annotations for JavaBean Properties and Other Purposes

464

(1)

Recap and What's Next

465

(2)

23 Application Design

467

(18)

Recap of What We Already Know

467

(1)

Annotations

468

(1)

Using @main Entry Points

469

(1)

Design Patterns

470

(4)

Creational Patterns

470

(1)

Structural Patterns

471

(1)

Behavioral Patterns

472

(2)

Better Design with Design by Contract

474

(3)

The Parthenon Architecture

477

(6)

Recap and What's Next

483

(2)

24 Metaprogramming: Macros And Reflection

485

(18)

Scala Compile Time Reflection

487

(1)

Java Runtime Reflection

488

(2)

Scala Reflect API

490

(1)

Type Class Derivation: Implementation Details

491

(1)

Scala 3 Metaprogramming

491

(11)

Inline

491

(5)

Macros

496

(4)

Staging

500

(2)

Wrapping Up and Looking Ahead

502

(1)

A Significant Indentation Versus Braces Syntax

503

(4)

Bibliography

507

(2)

Index

509

Dean Wampler (@deanwampler) is an expert in streaming data systems, focusing on applications of ML/AI. He is Head of Evangelism at Anyscale.io, which is focused on distributed Python for ML/AI. Previously, he was an engineering VP at Lightbend, where he led the development of Lightbend CloudFlow, an integrated system for building and running streaming data applications with Akka Streams, Apache Spark, Apache Flink, and Apache Kafka. Dean is the author of Fast Data Architectures for Streaming Applications, Programming Scala, Functional Programming for Java Developers, and the coauthor of Programming Hive, all from O'Reilly. He's a contributor to several open source projects. A frequent Strata Data Conference speaker, he's also the co-organizer of several conferences around the world and several user groups in Chicago. He has a Ph.D. in Physics from the University of Washington.

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