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Go Programming Language, The

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Go Programming Language, The

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About

Features

  • Helps students start using Go effectively right from the outset, then guides them to take full advantage of Go's rich set of advanced features
  • Extensively reviewed by Go's creators at Google for completeness and accuracy
  • Filled with short, carefully crafted code examples to demonstrate key language features and idioms

Description

  • Copyright 2016
  • Dimensions: 7-3/8" x 9-1/8"
  • Pages: 400
  • Edition: 1st
  • Book
  • ISBN-10: 0-13-419044-0
  • ISBN-13: 978-0-13-419044-0

The Go Programming Language is the authoritative resource for any programmer who wants to learn Go. It shows how to write clear and idiomatic Go to solve real-world problems. The book does not assume prior knowledge of Go nor experience with any specific language, so you’ll find it accessible whether you’re most comfortable with JavaScript, Ruby, Python, Java, or C++.

  • The first chapter is a tutorial on the basic concepts of Go, introduced through programs for file I/O and text processing, simple graphics, and web clients and servers.
  • Early chapters cover the structural elements of Go programs: syntax, control flow, data types, and the organization of a program into packages, files, and functions. The examples illustrate many packages from the standard library and show how to create new ones of your own. Later chapters explain the package mechanism in more detail, and how to build, test, and maintain projects using the go tool.
  • The chapters on methods and interfaces introduce Go’s unconventional approach to object-oriented programming, in which methods can be declared on any type and interfaces are implicitly satisfied. They explain the key principles of encapsulation, composition, and substitutability using realistic examples.
  • Two chapters on concurrency present in-depth approaches to this increasingly important topic. The first, which covers the basic mechanisms of goroutines and channels, illustrates the style known as communicating sequential processes for which Go is renowned. The second covers more traditional aspects of concurrency with shared variables. These chapters provide a solid foundation for programmers encountering concurrency for the first time.
  • The final two chapters explore lower-level features of Go. One covers the art of metaprogramming using reflection. The other shows how to use the unsafe package to step outside the type system for special situations, and how to use the cgo tool to create Go bindings for C libraries.

The book features hundreds of interesting and practical examples of well-written Go code that cover the whole language, its most important packages, and a wide range of applications. Each chapter has exercises to test your understanding and explore extensions and alternatives. Source code is freely available for download from http://gopl.io/ and may be conveniently fetched, built, and installed using the go get command.

Extras

Author's Site

Please visit the author's site here

Sample Content

Online Sample Chapter

The Go Programming Language: A Tutorial

Sample Pages

Download the sample pages (includes Chapter 1 and Index)

Table of Contents

Preface  xi

Chapter 1: Tutorial 1

1.1 Hello, World 1

1.2 Command-Line Arguments 4

1.3 Finding Duplicate Lines 8

1.4 Animated GIFs 13

1.5 Fetching a URL 15

1.6 Fetching URLs Concurrently 17

1.7 A Web Server 19

1.8 Loose Ends 23

Chapter 2: Program Structure 27

2.1 Names 27

2.2 Declarations 28

2.3 Variables 30

2.4 Assignments 36

2.5 Type Declarations 39

2.6 Packages and Files 41

2.7 Scope 45

Chapter 3: Basic Data Types 51

3.1 Integers 51

3.2 Floating-Point Numbers 56

3.3 Complex Numbers 61

3.4 Booleans 63

3.5 Strings 64

3.6 Constants 75

Chapter 4: Composite Types 81

4.1 Arrays 81

4.2 Slices 84

4.3 Maps 93

4.4 Structs 99

4.5 JSON 107

4.6 Text and HTML Templates 113

Chapter 5: Functions 119

5.1 Function Declarations 119

5.2 Recursion 121

5.3 Multiple Return Values 124

5.4 Errors 127

5.5 Function Values 132

5.6 Anonymous Functions 135

5.7 Variadic Functions 142

5.8 Deferred Function Calls 143

5.9 Panic 148

5.10 Recover 151

Chapter 6:. Methods 155

6.1 Method Declarations 155

6.2 Methods with a Pointer Receiver 158

6.3 Composing Types by Struct Embedding 161

6.4 Method Values and Expressions 164

6.5 Example: Bit Vector Type 165

6.6 Encapsulation 168

Chapter 7: Interfaces 171

7.1 Interfaces as Contracts 171

7.2 Interface Types 174

7.3 Interface Satisfaction 175

7.4 Parsing Flags with flag.Value 179

7.5 Interface Values 181

7.6 Sorting with sort.Interface 186

7.7 The http.Handler Interface 191

7.8 The error Interface 196

7.9 Example: Expression Evaluator 197

7.10 Type Assertions 205

7.11 Discriminating Errors with Type Assertions 206

7.12 Querying Behaviors with Interface Type Assertions 208

7.13 Type Switches 210

7.14 Example: Token-Based XML Decoding 213

7.15 A Few Words of Advice 216

Chapter 8: Goroutines and Channels 217

8.1 Goroutines 217

8.2 Example: Concurrent Clock Server 219

8.3 Example: Concu rent Echo Server 222

8.4 Channels 225

8.5 Looping in Parallel 234

8.6 Example: Concurrent Web Crawler 239

8.7 Multiplexing with select 244

8.8 Example: Concurrent Directory Traversal 247

8.9 Cancellation 251

8.10 Example: Chat Server 253

Chapter 9: Concurrency with Shared Variables 257

9.1 Race Conditions 257

9.2 Mutual Exclusion: sync.Mutex 262

9.3 Read/Write Mutexes: sync.RWMutex 266

9.4 Memory Synchronization 267

9.5 Lazy Initialization: sync.Once 268

9.6 The Race Detector 271

9.7 Example: Concurrent Non-Blocking Cache 272

9.8 Goroutines and Threads 280

Chapter 10: Packages and the Go Tool 283

10.1 Introduction 283

10.2 Import Paths 284

10.3 The Package Declaration 285

10.4 Import Declarations 285

10.5 Blank Imports 286

10.6 Packages and Naming 289

10.7 The Go Tool 290

Chapter 11: Testing 301

11.1 The go test Tool 302

11.2 Test Functions 302

11.3 Coverage 318

11.4 Benchmark Functions 321

11.5 Profiling 323

11.6 Example Functions 326

Chapter 12: Reflection 329

12.1 Why Reflection? 329

12.2 reflect.Type and reflect.Value 330

12.3 Display, a Recursive Value Printer 333

12.4 Example: Encoding S-Expressions 338

12.5 Setting Variables with reflect.Value 341

12.6 Example: Decoding S-Expressions 344

12.7 Accessing Struct Field Tags 348

12.8 Displaying the Methods of a Type 351

12.9 A Word of Caution 352

Chapter 13: Low-Level Programming 353

13.1 unsafe.Sizeof, Alignof, and Offsetof 354

13.2 unsafe.Pointer 356

13.3 Example: Deep Equivalence 358

13.4 Calling C Code with cgo 361

13.5 Another Word of Caution 366

Index 367

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