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

Polymorphism

Polymorphism is the ability to appear in various forms. For example, a shape can appear as a square, circle, rectangle, or any other shape:

Figure 7.4: Polymorphism example for shape

Go does not do subclassing like other object-oriented languages because Go does not have classes. Subclassing in object-oriented programming is inheriting from one class to another. By doing subclassing, you are inheriting the fields and methods of another class. Go provides a similar behavior through embedding structs and by using polymorphism through interfaces.

One of the advantages of using polymorphism is that it allows the reuse of methods that have been written once and tested. Code is reused by having an API that accepts an interface; if our type satisfies that interface, it can be passed to that API. There is no need to write additional code for each type; we just need to ensure we meet the interface method's set requirements. Obtaining polymorphism...