Go Fundamentals

<p>Foreword xxi<br>Preface xxiii<br>Acknowledgments xxxi<br>About the Authors xxxv</p> <p><strong>Chapter 1: Modules, Packages, and Dependencies 1</strong><br>Modules 1<br>Packages 4<br>Folders, Files, and Organization 6<br>Importing Packages and Modules 13<br>Dependencies 16<br>Summary 25</p> <p><strong>Chapter 2: Go Language Basics 27</strong><br>Go Language Overview 27<br>Numbers 31<br>Strings 35<br>UTF-8 37<br>Variables 40<br>Constants 48<br>Naming Identifiers 51<br>Printing and Formatting 57<br>Summary 75</p> <p><strong>Chapter 3: Arrays, Slices, and Iteration 77</strong><br>List Types: Arrays and Slices 77<br>How Slices Work 90<br>Iteration 104<br>Summary 110</p> <p><strong>Chapter 4: Maps and Control Structures 111</strong><br>Maps 111<br>If Statements 129<br>Switch Statements 135<br>Summary 140</p> <p><strong>Chapter 5: Functions 141</strong><br>Function Definitions 141<br>Variadic Arguments 151<br>Deferring Function Calls 156<br>Init 162<br>Summary 166</p> <p><strong>Chapter 6: Structs, Methods, and Pointers 167</strong><br>Structs 167<br>Methods 176<br>Pointers 182<br>Nil Receivers 191<br>Summary 193</p> <p><strong>Chapter 7: Testing 195</strong><br>Testing Basics 195<br>Code Coverage 202<br>Table Driven Testing 206<br>Running Tests 213<br>Test Helpers 222<br>Summary 229</p> <p><strong>Chapter 8: Interfaces 231</strong><br>Concrete Types versus Interfaces 231<br>Explicit Interface Implementation 233<br>Implicit Interface Implementation 234<br>Before Interfaces 235<br>Using Interfaces 237<br>Implementing io.Writer 239<br>Multiple Interfaces 241<br>Asserting Interface Implementation 241<br>The Empty Interface 242<br>Defining Interfaces 243<br>Embedding Interfaces 249<br>Type Assertion 250<br>Assertions through Switch 252<br>Using Assertions 255<br>Summary 257</p> <p><strong>Chapter 9: Errors 259</strong><br>Errors as Values 259<br>Panic 264<br>Don't Panic 273<br>Custom Errors 289<br>Wrapping and Unwrapping Errors 294<br>Errors As/Is 301<br>Stack Traces 307<br>Summary 309</p> <p><strong>Chapter 10: Generics 311</strong><br>What Are Generics? 311<br>Summary 334</p> <p><strong>Chapter 11: Channels 335</strong><br>Concurrency and Parallelism 335<br>Go's Concurrency Model 338<br>Communicating with Channels 342<br>Unidirectional Channels 351<br>Closing Channels 352<br>Buffered Channels 358<br>Capturing System Signals with Channels 363<br>Summary 371</p> <p><strong>Chapter 12: Context 373</strong><br>The Context Interface 374<br>Context Rules 380<br>Context Nodal Hierarchy 381<br>Context Values 384<br>Problems with String Keys 388<br>Securing Context Keys and Values 393<br>Cancellation Propagation with Contexts 396<br>Timeouts and Deadlines 405<br>Context Errors 408<br>Listening for System Signals with Context 411<br>Summary 416</p> <p><strong>Chapter 13: Synchronization 419</strong><br>Waiting for Goroutines with a WaitGroup 419<br>Error Management with Error Groups 433<br>Data Races 443<br>Synchronizing Access with a Mutex 447<br>Performing Tasks Only Once 459<br>Summary 466</p> <p><strong>Chapter 14: Working with Files 467</strong><br>Directory Entries and File Information 467<br>Walking Directories 473<br>Skipping Directories and Files 477<br>Creating Directories and Subdirectories 481<br>File Path Helpers 484<br>Creating Multiple Directories 489<br>Creating Files 492<br>Fixing the Walk Tests 497<br>Appending to Files 500<br>Reading Files 503<br>Beware of Windows 505<br>The FS Package 506<br>Using the FS Interface 510<br>Mocking a File System 513<br>Embedding Files 517<br>Summary 522</p> <p>Index 523</p>