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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Hello World!

The following is the Go version of the Hello World program. Please type it and save it as hw.go:

package main
import (
func main() {
    fmt.Println("Hello World!")

Each Go source code begins with a package declaration. In this case, the name of the package is main, which has a special meaning in Go. The import keyword allows you to include functionality from existing packages. In our case, we only need some of the functionality of the fmt package that belongs to the standard Go library. Packages that are not part of the standard Go library are imported using their full internet path. The next important thing if you are creating an executable application is a main() function. Go considers this the entry point to the application and begins the execution of the application with the code found in the main() function of the main package.

hw.go is a Go program that runs on its own. Two characteristics make hw.go an autonomous...