Contenido del Curso

Advanced JavaScript Mastery

1. Mastering JavaScript Classes and Inheritance

Getting Started Understanding Class Declarations in JavaScript Challenge: Create a JavaScript Class Defining Methods in JavaScript Classes Challenge: Add Methods to a Class Using Parameter Objects Working with Private Properties in Classes Challenge: Implement Private Properties in a Class Managing Properties with Getters and Setters Challenge: Implement Getters and Setters in a Class Exploring Static Properties in JavaScript Using Static Methods in JavaScript Challenge: Implement Static Properties and Methods in a Class Understanding Inheritance with extends and super()Challenge: Implement Class Inheritance with extends and super()

2. DOM Manipulation for Interactive Web Development

What Is the Document Object Model (DOM)?Querying and Selecting Elements in the DOM Challenge: Query and Select DOM Elements Understanding the DOM Hierarchy and Relationships Challenge: Navigate the DOM Hierarchy Exploring DOM Properties in JavaScript Working with Element Attributes in the DOM Challenge: Manage Element Properties and Attributes Adding Elements to the DOM Dynamically Removing Elements From the DOM Challenge: Add and Remove DOM Elements Modifying Element Styles with JavaScript Challenge: Apply Dynamic Styles to DOM Elements

3. Event Handling and User Interactions in JavaScript

Introduction to Events and Event Listeners Understanding the Event Object in JavaScript Challenge: Implement Event Listeners Event Propagation and Delegation Explained Challenge: Handle Event Propagation and Delegation Working with Keyboard and Mouse Events Managing and Removing Event Listeners

4. Asynchronous JavaScript and API Integration

Introduction to Asynchronous JavaScript Understanding Callbacks in JavaScript Handling Asynchronous Operations with Promises Using Async/Await for Cleaner Asynchronous Code Fetching and Working with APIs in JavaScript Integrating APIs in JavaScript Applications Challenge: Fetch and Use API Data Integrating Third-Party Libraries in JavaScript Challenge: Work with Third-Party Libraries Handling Multiple Asynchronous Requests

Challenge: Implement Static Properties and Methods in a Class

Task

Imagine you're building an inventory management system for an online store. The Product class needs to keep track of the total number of products added to the inventory, as well as provide functionality to compare the prices of two products.

Define a Static Property:
- In the Product class, create a static property totalProducts initialized to 0;
- Each time a new Product instance is created, increment totalProducts by 1 to keep track of how many products have been added to the inventory.
Define a Static Method: Define a static method comparePrices(product1, product2) that takes two Product instances as parameters and returns:
- "Product 1 is more expensive" if product1 has a higher price;
- "Product 2 is more expensive" if product2 has a higher price;
- "Both products have the same price" if they are equal.


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class Product {
  _____ _____ = 0; // Define static property for total products

  constructor(name, price) {
    this.name = name;
    this.price = price;
    Product._____+=1; // Increment totalProducts
  }

  // Static method to compare prices
  _____ comparePrices(product1, product2) {
    if (product1.price > product2.price) {
      return _____;
    } else if (_____ < _____) {
      return _____;
    } else {
      return 'Both products have the same price';
    }
  }
}

// Testing
const product1 = new Product('Laptop', 1200);
const product2 = new Product('Smartphone', 800);
const product3 = new Product('Tablet', 1200);

console.log(Product.comparePrices(product1, product2)); // Expected: Product 1 is more expensive
console.log(Product.comparePrices(product1, product3)); // Expected: Both products have the same price
console.log(Product.comparePrices(product2, product3)); // Expected: Product 2 is more expensive

console.log(Product.totalProducts); // Expected: 3

Define a static property named totalProducts and initialize it to 0;
In the constructor, increment Product.totalProducts by 1 each time a new Product instance is created;
Define a static method comparePrices(product1, product2) that takes two parameters: product1 and product2;
In comparePrices, use an if statement to check if product1.price is greater than product2.price. If true, return "Product 1 is more expensive";
Use an else if statement to check if product1.price is less than product2.price. If true, return "Product 2 is more expensive".


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class Product {
  static totalProducts = 0; // Define static property for total products

  constructor(name, price) {
    this.name = name;
    this.price = price;
    Product.totalProducts+=1; // Increment totalProducts
  }

  // Static method to compare prices
  static comparePrices(product1, product2) {
    if (product1.price > product2.price) {
      return 'Product 1 is more expensive';
    } else if (product1.price < product2.price) {
      return 'Product 2 is more expensive';
    } else {
      return 'Both products have the same price';
    }
  }
}

// Testing
const product1 = new Product('Laptop', 1200);
const product2 = new Product('Smartphone', 800);
const product3 = new Product('Tablet', 1200);

console.log(Product.comparePrices(product1, product2)); // Output: Product 1 is more expensive
console.log(Product.comparePrices(product1, product3)); // Output: Both products have the same price
console.log(Product.comparePrices(product2, product3)); // Output: Product 2 is more expensive

console.log(Product.totalProducts); // Output: 3

¿Todo estuvo claro?

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Sección 1. Capítulo 13