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The Go Programming Language
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Table of Contents

Preface xiChapter 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 23Chapter 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 45Chapter 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 75Chapter 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 113Chapter 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 151Chapter 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 168Chapter 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 216Chapter 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 253Chapter 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 280Chapter 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 290Chapter 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 326Chapter 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 352Chapter 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

About the Author

Alan A. A. Donovan is a member of Google's Go team in New York. He holds computer science degrees from Cambridge and MIT and has been programming in industry since 1996. Since 2005, he has worked at Google on infrastructure projects and was the co-designer of its proprietary build system, Blaze. He has built many libraries and tools for static analysis of Go programs, including oracle, godoc -analysis, eg, and gorename.Brian W. Kernighan is a professor in the Computer Science Department at Princeton University. He was a member of technical staff in the Computing Science Research Center at Bell Labs from 1969 until 2000, where he worked on languages and tools for Unix. He is the co-author of several books, including The C Programming Language, Second Edition (Prentice Hall, 1988), and The Practice of Programming (Addison-Wesley, 1999).

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