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. Variables and Operators
2. Logic and Loops

TypeOf and ValueOf

To use reflection, you will need to get familiar with two types defined in the reflect package:


Both of these types provide utility functions that give you access to the dynamic runtime information of the object.

These two functions give you a handle on the Type and Value of the object:

func TypeOf( interface{}) Type
func ValueOf( interface{}) Value

The following program uses the two functions to print the Type and Value of the object being passed:

func main() {
  var x = 5
  var y = []string{"test"}
  var z = map[string]string{"a": "b"}
func Print(a interface{}) {
  fmt.Println("Type: ", reflect.TypeOf(a))
  fmt.Println("Value: ", reflect.ValueOf(a))

The output of the preceding program should print the Type of x:

$ go run main.go
Type: int
Value 5...