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

19. Special Features

Activity 19.01: Defining Build Constraints Using Filenames

Solution:

  1. Create a directory called custom.
  2. Inside this directory, create a file called print_darwin.go.
  3. Define a function called Print():
    package custom
    import "fmt"
    func Print() {
      fmt.Println("Hello I am running on a darwin machine.")
    }
  4. Create another file inside the custom directory called print_386.go.
  5. Define a function inside this package called Print():
    import "fmt"
    func Print() {
      fmt.Println("Hello I am running on 386 machine.")
    }
  6. Run the program using the following command:
    go run main.go

    You should see the following output:

    $ go run main.go
    Hello I am running on a darwin machine.

Activity 19.02: Using Wildcard with Go Test

Solution:

  1. Create a directory called package1:

    Figure 19.5: Directory structure

  2. Create run_test.go in this directory with the following test cases defined:
    package package1...