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 viper package

viper is a powerful Go package that supports a plethora of options. All viper projects follow a pattern. First, you initialize viper and then you define the elements that interest you. After that, you get these elements and read their values in order to use them. Notice that the viper package can entirely replace the flag package.

The desired values can be either taken directly, as happens when you are using the flag package of the standard Go library, or indirectly using configuration files. When using formatted configuration files in the JSON, YAML, TOML, HCL, or Java properties format, viper does all the parsing for you, which saves you from having to write and debug lots of Go code. viper also allows you to extract and save values in Go structures. However, this also requires the fields of the Go structure to match the keys of the configuration file.

The home...