Declaring functions and classes in Typescript - Mini Project: Build & Apply

Declaring functions and classes

📖 Scenario: You are building a simple program to manage a small library. You want to keep track of books and be able to describe them with a function.

🎯 Goal: Create a Book class with properties, a function to describe a book, and print the description.

📋 What You'll Learn

Create a Book class with title and author properties

Create a function called describeBook that takes a Book object and returns a string description

Create an instance of Book with exact values

Print the description returned by describeBook

💡 Why This Matters

🌍 Real World

Managing books in a library or bookstore software requires classes to represent books and functions to describe or manipulate them.

💼 Career

Understanding how to declare classes and functions is fundamental for software development jobs, especially when working with object-oriented programming languages like TypeScript.

1

Create the Book class

Create a Book class with a constructor that takes title and author as strings and sets them as public properties.

Typescript

// Your code here

Need a hint?

Use class Book { constructor(public title: string, public author: string) {} } to create the class.

2

Create the describeBook function

Create a function called describeBook that takes a parameter book of type Book and returns a string in the format: "Title: [title], Author: [author]".

Typescript

class Book {
    constructor(public title: string, public author: string) {}
}

// Your code here

Need a hint?

Use a function with a template string to return the description.

3

Create a Book instance

Create a variable called myBook and assign it a new Book instance with title set to "The Great Gatsby" and author set to "F. Scott Fitzgerald".

Typescript

class Book {
    constructor(public title: string, public author: string) {}
}

function describeBook(book: Book): string {
    return `Title: ${book.title}, Author: ${book.author}`;
}

// Your code here

Need a hint?

Use const myBook = new Book("The Great Gatsby", "F. Scott Fitzgerald") to create the instance.

4

Print the book description

Use console.log to print the result of calling describeBook with myBook.

Typescript

class Book {
    constructor(public title: string, public author: string) {}
}

function describeBook(book: Book): string {
    return `Title: ${book.title}, Author: ${book.author}`;
}

const myBook = new Book("The Great Gatsby", "F. Scott Fitzgerald");

// Your code here

Need a hint?

Use console.log(describeBook(myBook)) to print the description.