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

The go vet Tool

The go vet tool is used for static analysis of your Go code. While the Go compiler can find and inform you of mistakes you may have made, there are certain things it will miss. For this reason, the go vet tool was created. This might sound trivial, but some of these issues could go unnoticed for a long time after the code has been deployed, the most common of which is passing the wrong number of arguments when using the Prinf function. It will also check for useless assignments, for example, if you set a variable and then never use that variable. Another particularly useful thing it detects is when a non-pointer interface is passed to an "unmarshal" function. The compiler won't notice this as it is valid; however, the unmarshal function will be unable to write the data to the interface. This can be troublesome to debug but using the go vet tool allows you to catch it early and remediate the issue before it becomes a problem.

Exercise 17.05: Using the...