Book Image

The Go Workshop

By : Delio D'Anna, Andrew Hayes, Sam Hennessy, Jeremy Leasor, Gobin Sougrakpam, Dániel Szabó
5 (1)
Book Image

The Go Workshop

5 (1)
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
1. Variables and Operators
2
2. Logic and Loops

Atomic Operations

Let's imagine we want to run independent functions again. However, in this case, we want to modify the value held by a variable. We still want to sum the numbers from 1 to 100, but we want to split the work into two concurrent Goroutines. We can sum the numbers from 1 to 50 in one routine and the numbers from 51 to 100 in another routine. At the end, we will need still to receive the value of 5050, but two different routines can add a number at the same time to the same variable. Let's see an example with only 4 numbers where we want to sum 1, 2, 3, and 4, and the result is 10.

Think of it like having a variable called s:=0 and then making a loop where the value of s becomes the following:

s=0
s=1
s=3 //(1+2)
s=6
s=10

However, we could also have the following loop. In this case, the order in which the numbers are summed is different:

S=0
s=1
s=4 //3+1, the previous value of 1
s=6 //2+4 the previous value of 4
s=10

Essentially, this is just...