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
1. Variables and Operators
2
2. Logic and Loops

Introduction

In the previous chapter, we discussed error handling in Go. We looked at what an error is in Go. We discovered that an error in Go is anything that implements the error interface. At the time, we did not investigate what an interface was. In this chapter, we are going to look at what an interface is.

For example, your manager requests that you create an API that can accept JSON data. The data contains information about various employees, such as their address and the hours they worked on a project. The data will need to be parsed into an employee struct, a relatively simple task. You then create a function called loadEmployee(s string). The function will accept a string that is formatted as JSON, and then parse that string to load the employee struct.

Your manager is happy with the work; however, he has another requirement. The clients need the ability to accept a file with the employee data in JSON format. The functionality to be performed is the same underlying...