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

The cobra package

cobra is a very handy and popular Go package that allows you to develop command-line utilities with commands, subcommands, and aliases. If you have ever used hugo, docker, or kubectl you will understand immediately what Cobra does, as all these tools were developed using cobra.

As you will see in this section, commands in cobra can have one or more aliases, which is very handy when you want to please both amateur and experienced users. cobra also supports Persistent Flags and Local Flags, which are flags that are available to all commands and flags that are available to a given command only, respectively. Also, by default, cobra uses viper for parsing its command-line arguments.

All cobra projects follow the same development pattern. You use the cobra tool, then you create commands, and then you make the desired changes to the generated Go source code files...