Book Image

Mastering Go - Second Edition

By : Mihalis Tsoukalos
Book Image

Mastering Go - Second Edition

By: Mihalis Tsoukalos

Overview of this book

Often referred to (incorrectly) as Golang, Go is the high-performance systems language of the future. Mastering Go, Second Edition helps you become a productive expert Go programmer, building and improving on the groundbreaking first edition. Mastering Go, Second Edition shows how to put Go to work on real production systems. For programmers who already know the Go language basics, this book provides examples, patterns, and clear explanations to help you deeply understand Go’s capabilities and apply them in your programming work. The book covers the nuances of Go, with in-depth guides on types and structures, packages, concurrency, network programming, compiler design, optimization, and more. Each chapter ends with exercises and resources to fully embed your new knowledge. This second edition includes a completely new chapter on machine learning in Go, guiding you from the foundation statistics techniques through simple regression and clustering to classification, neural networks, and anomaly detection. Other chapters are expanded to cover using Go with Docker and Kubernetes, Git, WebAssembly, JSON, and more. If you take the Go programming language seriously, the second edition of this book is an essential guide on expert techniques.
Table of Contents (20 chapters)
Title Page

Developing your own Go packages

The source code of a Go package, which can contain multiple files and multiple directories, can be found within a single directory that is named after the package name, with the obvious exception of the main package, which can be located anywhere.

For the purposes of this section, a simple Go package named aPackage will be developed. The source file of the package is called aPackage.go, and its source code will be presented in two parts.

The first part of aPackage.go is shown in the following Go code:

package aPackage 
 
import ( 
    "fmt" 
) 
 
func A() { 
    fmt.Println("This is function A!") 
} 

Notice that using capital letters in Go package names is not considered a good practice – aPackage is only used here as an example.

The second code segment of aPackage.go follows:

func B() { 
    fmt.Println("privateConstant...