Book Image

The Go Workshop

By : Delio D'Anna, Andrew Hayes, Sam Hennessy, Jeremy Leasor, Gobin Sougrakpam, Dániel Szabó
5 (2)
Book Image

The Go Workshop

5 (2)
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

Recover

Go provides us with the ability to regain control after panic has occurred. Recover is a function that is used to regain control of a panicking Goroutine.

The signature of the recover() function is as follows:

func recover() interface{}

The recover() function accepts no arguments and returns an empty interface{}. For now, an empty interface{} indicates that any type can be returned. The recover() function will return the value sent to the panic() function.

The recover() function is only useful inside a deferred function. As you may recall, a deferred function gets executed before the encompassing function terminates. Executing a call to the recover() function inside a deferred function stops the panicking by restoring normal execution. If the recover() function is called outside a deferred function, it will not stop the panicking.

The following diagram shows the steps a program would take when using panic(), recover(), and a defer() function:

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