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)

Converting data types and interface casting

Go is typically very flexible when used to convert data from one type to another. A type may inherit another type, as follows:

type A int

We can always cast back to the type we inherited, as follows:

var a A = 1
fmt.Println(int(a))

There are also convenience functions for converting between numbers using casting, between strings and other types using fmt.Sprint and strconv, and between interfaces and types using reflection. This recipe will explore some of these basic conversions, which will be used throughout this book.

How to do it...

The following steps cover how to write and run your application:

  1. From your Terminal/console application,createa new directory called~/projects/go-programming-cookbook/chapter3/dataconv.
  2. Navigate to this directory.
  3. Run the following command:
          $ go mod init github.com/PacktPublishing/Go-Programming...