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

About the bytes package

The bytes standard Go package contains functions for working with byte slices in the same way that the strings standard Go package helps you to work with strings. The name of the Go source code file is bytes.go, and it will be presented in three code portions.

The first part of bytes.go follows:

package main 
 
import ( 
    "bytes" 
    "fmt" 
    "io" 
    "os" 
) 

The second code portion of bytes.go contains the following Go code:

func main() { 
    var buffer bytes.Buffer 
    buffer.Write([]byte("This is")) 
    fmt.Fprintf(&buffer, " a string!\n") 
    buffer.WriteTo(os.Stdout) 
    buffer.WriteTo(os.Stdout) 

First, you create a new bytes.Buffer variable and you put data into it using buffer.Write() and fmt.Fprintf(). Then, you call buffer.WriteTo() twice.

The first buffer.WriteTo() call...