Struct usage patterns in Go - Mini Project: Build & Apply

Struct usage patterns

📖 Scenario: You are building a simple program to manage information about books in a library. Each book has a title, author, and number of pages.

🎯 Goal: Create a Go program that uses a struct to store book information, then create an instance of the struct, update a field, and print the book details.

📋 What You'll Learn

Define a struct named Book with fields Title (string), Author (string), and Pages (int).

Create a variable myBook of type Book with specific values.

Update the Pages field of myBook.

Print the details of myBook using fmt.Println.

💡 Why This Matters

🌍 Real World

Structs are used in Go to model real-world objects like books, users, or products by grouping related information together.

💼 Career

Understanding structs is essential for Go programming jobs, especially when working with data models, APIs, or databases.

1

Define the Book struct

Define a struct named Book with these fields: Title of type string, Author of type string, and Pages of type int.

Go

package main

import "fmt"

type Book struct {
    // Define Title, Author, and Pages fields here
}

func main() {

    // Your code here
}

Hint

Use the type keyword to define a struct. Each field has a name and a type.

2

Create a Book variable

Inside the main function, create a variable named myBook of type Book with these values: Title set to "Go Programming", Author set to "Alice", and Pages set to 300.

Go

package main

import "fmt"

type Book struct {
    Title  string
    Author string
    Pages  int
}

func main() {
    // Create myBook variable with given values
    // Your code here
}

Hint

Use struct literal syntax with field names to create myBook.

3

Update the Pages field

Update the Pages field of myBook to 350 inside the main function.

Go

package main

import "fmt"

type Book struct {
    Title  string
    Author string
    Pages  int
}

func main() {
    myBook := Book{
        Title:  "Go Programming",
        Author: "Alice",
        Pages:  300,
    }
    // Update Pages field to 350
    // Your code here
}

Hint

Use dot notation to change the Pages field value.

4

Print the book details

Use fmt.Println to print the myBook variable inside the main function.

Go

package main

import "fmt"

type Book struct {
    Title  string
    Author string
    Pages  int
}

func main() {
    myBook := Book{
        Title:  "Go Programming",
        Author: "Alice",
        Pages:  300,
    }
    myBook.Pages = 350
    // Print myBook details
    // Your code here
}

Hint

Use fmt.Println(myBook) to print the struct values.