Book Image

The Go Workshop

By : Delio D'Anna, Andrew Hayes, Sam Hennessy, Jeremy Leasor, Gobin Sougrakpam, Dániel Szabó
Book Image

The Go Workshop

By: Delio D'Anna, Andrew Hayes, Sam Hennessy, Jeremy Leasor, Gobin Sougrakpam, Dániel Szabó

Overview of this book

The Go Workshop will take the pain out of learning the Go programming language (also known as Golang). It is designed to teach you to be productive in building real-world software. Presented in an engaging, hands-on way, this book focuses on the features of Go that are used by professionals in their everyday work. Each concept is broken down, clearly explained, and followed up with activities to test your knowledge and build your practical skills. Your first steps will involve mastering Go syntax, working with variables and operators, and using core and complex types to hold data. Moving ahead, you will build your understanding of programming logic and implement Go algorithms to construct useful functions. As you progress, you'll discover how to handle errors, debug code to troubleshoot your applications, and implement polymorphism using interfaces. The later chapters will then teach you how to manage files, connect to a database, work with HTTP servers and REST APIs, and make use of concurrent programming. Throughout this Workshop, you'll work on a series of mini projects, including a shopping cart, a loan calculator, a working hours tracker, a web page counter, a code checker, and a user authentication system. By the end of this book, you'll have the knowledge and confidence to tackle your own ambitious projects with Go.
Table of Contents (21 chapters)
Free Chapter
1. Variables and Operators
2. Logic and Loops


In the previous exercise, we used a not-so-elegant method to ensure that the Goroutine ends by making the main routine wait for a second. The important thing to understand is that even if a program does not explicitly use Goroutines via the go call, it still uses one Goroutine, which is the main routine. When we run our program and create a new Goroutine, we are running two Goroutines: the main one and the one we just created. In order to synchronize these two Goroutines, Go gives us a function called WaitGroup. You can define a WaitGroup using the following code:

wg := sync.WaitGroup{}

WaitGroup needs the sync package to be imported. A typical code using the WaitGroup will be something like this:

package main
import "sync"
func main() {
  wg := &sync.WaitGroup{}