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

Decoding JSON

When we talk about decoding JSON, what we are stating is that we are taking a JSON data structure and converting it into a Go data structure. Converting the JSON into a Go data structure gives us the benefit of working with the data natively. For example, if the JSON data has a field that is an array in Go, that would get decoded to a slice. We will then be able to treat that slice as we would any other slice, meaning we can iterate over the slice using a range clause, we can get the length of the slice, append to the slice, and so on.

If we know what our JSON looks like ahead of time, we can use structs when parsing the JSON. Using Go terms, we need to be able to unmarshal the JSON-encoded data and store the results in the struct. To be able to do this, we will need to import the encoding/json package. We will be using the JSON Unmarshal function. Unmarshaling is the process of parsing JSON to a data structure. Often, you will hear unmarshaling and decoding used interchangeably...