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 flag package

Flags are specially-formatted strings that are passed into a program to control its behavior. Dealing with flags on your own might become very difficult if you want to support multiple flags. Thus, if you are developing UNIX system command-line utilities, you will find the flag package very interesting and useful.

The flag package makes no assumptions about the order of command-line arguments and options, and it prints helpful messages in case there was an error in the way the command-line utility was executed.

The biggest advantage of the flag package is that it is part of the standard Go library, which means that it has been extensively tested and debugged.

I will present two Go programs that use the flag package: a simple one and a more advanced one. The first one, named simpleFlag.go, will be offered in four parts. The simpleFlag.go program will recognize...