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

17. Using Go Tools

Activity 17.01: Using gofmt, goimport, go vet, and go get to Correct a File

Solution:

  1. Run gofmt against the file to check for any formatting issues and see that they make sense:
    gofmt main.go

    This should output a much neater-looking file, as follows:

    Figure 17.11: Expected output from gofmt

  2. Use the -w option on gofmt to make the changes to the file and save them:
    gofmt -w main.go
  3. Check the imports are correct using goimports:
    goimport main.go
  4. Use goimports to fix the import statements in the file:
    goimports -w main.go
  5. The final stage is to use go vet to check for any issues the compiler might miss. Run it against main.go to check for any issues:
    go vet main.go
  6. It will find an issue with unreachable code, as shown in the following output:

    Figure 17.12: Expected output from go vet

  7. Correct the issue by moving the log.Println("completed") line so that it runs before the return statement:
    func ExampleHandler(w http.ResponseWriter, r...