Book Image

Go Programming Cookbook - Second Edition

By : Aaron Torres
Book Image

Go Programming Cookbook - Second Edition

By: Aaron Torres

Overview of this book

Go (or Golang) is a statically typed programming language developed at Google. Known for its vast standard library, it also provides features such as garbage collection, type safety, dynamic-typing capabilities, and additional built-in types. This book will serve as a reference while implementing Go features to build your own applications. This Go cookbook helps you put into practice the advanced concepts and libraries that Golang offers. The recipes in the book follow best practices such as documentation, testing, and vendoring with Go modules, as well as performing clean abstractions using interfaces. You'll learn how code works and the common pitfalls to watch out for. The book covers basic type and error handling, and then moves on to explore applications, such as websites, command-line tools, and filesystems, that interact with users. You'll even get to grips with parallelism, distributed systems, and performance tuning. By the end of the book, you'll be able to use open source code and concepts in Go programming to build enterprise-class applications without any hassle.
Table of Contents (16 chapters)

Using command-line arguments

The flags from the previous recipe are a type of command-line argument. This chapter will expand on other uses for these arguments by constructing a command that supports nested subcommands. This will demonstrate flagsets and also use positional arguments that are passed into your application.

Like the previous recipe, this one requires a main function to run. There are a number of third-party packages that deal with complex nested arguments and flags, but we'll investigate how to do this using only the standard library.

How to do it...

These steps cover writing and running your application:

  1. From your Terminal or console application,createa new directory called~/projects/go-programming-cookbook/chapter2/cmdargs.
  2. Navigate to this directory.
  3. Run the following command:
          $ go mod init github.com/PacktPublishing/Go-Programming-Cookbook-Second-Edition/chapter2...