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

14. Using the Go HTTP Client

Activity 14.01: Requesting Data from a Web Server and Processing the Response

Solution:

  1. Add the necessary imports:
    package main
    import (
        "encoding/json"
        "fmt"
        "io/ioutil"
        "log"
        "net/http"
    )

    Here, encoding/json is used to parse the response and marshal it into the structs. fmt is used to print out the counts and io/ioutil is used to read in the response body. log is used if something goes wrong to output the error. net/http is what we use to do the GET request.

  2. Create structs to parse the data:
    type Names struct {
        Names []string `json:"names"`
    }
  3. Create a function called getDataAndParseResponse() that returns two integers:
    func getDataAndParseResponse() (int, int) {
  4. Send a GET request to the server:
        r, err := http...