Go tutorial – Chapter 7: Building real-world applications

You can use GO to build real-world applications. These applications can be web applications, mobile applications, desktop applications, or other types of applications.

Web applications

How to build a web server in Go?

To build a web server in Go, you can use the net/http package:

package main

import (
    "fmt"
    "net/http"
)

func handler(w http.ResponseWriter, r *http.Request) {
    fmt.Fprintf(w, "Hello, world!")
}

func main() {
    http.HandleFunc("/", handler)
    http.ListenAndServe(":8080", nil)
}

This program creates a handler function that writes the string “Hello, world!” to the response writer. It then registers the handler function to handle requests to the root path and starts the web server on port 8080.

How to build a REST API in Go?

To build a REST API in Go, you can use the net/http package and the httprouter package:

package main

import (
    "fmt"
    "net/http"

    "github.com/julienschmidt/httprouter"
)

func getUser(w http.ResponseWriter, r *http.Request, _ httprouter.Params) {
    fmt.Fprintf(w, "Get user")
}

func createUser(w http.ResponseWriter, r *http.Request, _ httprouter.Params) {
    fmt.Fprintf(w, "Create user")
}

func updateUser(w http.ResponseWriter, r *http.Request, _ httprouter.

Desktop applications

How to build a desktop application in Go?

To build a desktop application in Go, you can use a GUI library such as GTK or Qt. Here is an example of a simple GTK application in Go:

package main

import (
    "github.com/gotk3/gotk3/gtk"
)

func main() {
    gtk.Init(nil)

    win, err := gtk.WindowNew(gtk.WINDOW_TOPLEVEL)
    if err != nil {
        panic(err)
    }
    win.SetTitle("Hello, world!")
    win.Connect("destroy", func() {
        gtk.MainQuit()
    })

    btn, err := gtk.ButtonNewWithLabel("Click me")
    if err != nil {
        panic(err)
    }
    btn.Connect("clicked", func() {
        fmt.Println("Button clicked")
    })
    win.Add(btn)

    win.ShowAll()
    gtk.Main()
}

This program creates a GTK window with a button that displays the message “Hello, world!” when clicked.

Mobile applications

How to build a mobile application in Go?

To build a mobile application in Go, you can use a cross-platform mobile framework such as Flutter or React Native. Here is an example of a simple Flutter application in Go:

package main

import "github.com/flutter/flutter"

func main() {
    flutter.RunApp(flutter.AppInfo{
        Name: "Hello, world!",
    })
}

This program creates a Flutter application with the name “Hello, world!”.

Conclusion

• Recap of building real-world applications To build real-world applications in Go, you can use various tools and frameworks such as the net/http package for web applications, GUI libraries for desktop applications, and mobile frameworks for mobile applications.
• Tips for building real-world applications Here are some tips for building real-world applications:
  • Research and choose the right tool or framework for your application.
  • Test and debug your application to ensure it works as intended.
  • Consider scalability and performance when building your application.