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

Finding unreachable Go code

Go code that cannot be executed is a logical error, and therefore it is pretty difficult to reveal it with developers or a normal execution of the Go compiler. Put simply, there is nothing wrong with unreachable code, apart from the fact that there is no way for this code to get executed.

Take a look at the following Go code, which is saved as cannotReach.go:

package main 
import ( 
func f1() int { 
    fmt.Println("Entering f1()") 
    return -10 
    fmt.Println("Exiting f1()") 
    return -1 
func f2() int { 
    if true { 
        return 10 
    fmt.Println("Exiting f2()") 
    return 0 
func main() { 
    fmt.Println("Exiting program...") 

There is nothing syntactically incorrect with the Go code of cannotReach.go. As a result, you can execute...