Book Image

Mastering Go – Third Edition - Third Edition

By : Mihalis Tsoukalos
5 (2)
Book Image

Mastering Go – Third Edition - Third Edition

5 (2)
By: Mihalis Tsoukalos

Overview of this book

Mastering Go is the essential guide to putting Go to work on real production systems. This freshly updated third edition includes topics like creating RESTful servers and clients, understanding Go generics, and developing gRPC servers and clients. Mastering Go was written for programmers who want to explore the capabilities of Go in practice. As you work your way through the chapters, you’ll gain confidence and a deep understanding of advanced Go concepts, including concurrency and the operation of the Go Garbage Collector, using Go with Docker, writing powerful command-line utilities, working with JavaScript Object Notation (JSON) data, and interacting with databases. You’ll also improve your understanding of Go internals to optimize Go code and use data types and data structures in new and unexpected ways. This essential Go programming book will also take you through the nuances and idioms of Go with exercises and resources to fully embed your newly acquired knowledge. With the help of Mastering Go, you’ll become an expert Go programmer by building Go systems and implementing advanced Go techniques in your projects.
Table of Contents (17 chapters)
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File I/O

This section discusses file I/O in Go, which includes the use of the io.Reader and io.Writer interfaces, buffered and unbuffered I/O, as well as the bufio package.

The io/ioutil package ( is deprecated in Go version 1.16. Existing Go code that uses the functionality of io/ioutil will continue to work but it is better to stop using that package.

The io.Reader and io.Writer interfaces

This subsection presents the definitions of the popular io.Reader and io.Writer interfaces because these two interfaces are the basis of file I/O in Go—the former allows you to read from a file whereas the latter allows you to write to a file. The definition of the io.Reader interface is the following:

type Reader interface {
    Read(p []byte) (n int, err error)

This definition, which should be revisited when we want one of our data types to satisfy the io.Reader interface, tells us the following:

  • The Reader...