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

Log Fatal Errors

Using the log package, we can also log fatal errors. The Fatal(), Fatalf(), and Fatalln() functions are similar to Print(), Printf(), and Println(). The difference is after the log Fatal() functions are followed by an os.Exit(1) a system call. The log package also has the following functions: Panic, Panicf, and Panicln. The difference between the Panic() functions and the Fatal function is that the Panic functions are recoverable. When using the Panic functions, you can use the defer() function, whereas when using the Fatal functions, you cannot. As stated earlier, the Fatal functions call os.Exit(); a defer function will not be called when an os.Exit() gets called. There may be some instances where you want to abort the program immediately with no possibility of recovery. For example, the application may have gotten to a state where it is best to exit it before data corruption or undesired behavior results. Or you may have developed a command-line utility that is...