Welcome, aspiring JavaScript developers and enthusiasts! Today, we embark on an exhilarating journey delving into the intricacies of JavaScript through challenging assignments and expert solutions. At programminghomeworkhelp.com, we understand the importance of hands-on practice and guidance in mastering this versatile programming language. Hence, we present to you a glimpse of our expertise in solving complex JavaScript assignments.

Question 1: Manipulating Arrays

Let's begin with a task that involves array manipulation. Consider a scenario where you have an array of objects representing books. Each book object has properties such as title, author, and publication year. Your task is to write a function that takes this array of book objects and returns an array of book titles published after the year 2000.

```javascript
function booksPublishedAfter2000(books) {
return books.filter(book => book.year > 2000).map(book => book.title);
}

// Sample Usage
const books = [
{ title: "The Alchemist", author: "Paulo Coelho", year: 1988 },
{ title: "Eloquent JavaScript", author: "Marijn Haverbeke", year: 2011 },
{ title: "Clean Code", author: "Robert C. Martin", year: 2008 },
// Add more book objects here
];

console.log(booksPublishedAfter2000(books)); // Output: ["Eloquent JavaScript", "Clean Code"]
```

Solution Explanation:

- The `filter` method is used to create a new array with all elements that pass the test implemented by the provided function. In this case, we filter out the books published after the year 2000.
- Then, the `map` method is used to create a new array with the results of calling a provided function on every element in the calling array. Here, we map each book object to its title.

Question 2: Asynchronous Programming

Moving on to a more advanced topic, let's explore asynchronous programming. Imagine you are tasked with fetching data from an API and performing some operations on the retrieved data. Your goal is to write a function that fetches data from a given API endpoint and returns the total number of completed tasks.

```javascript
async function fetchAndCountCompletedTasks(endpoint) {
try {
const response = await fetch(endpoint);
const data = await response.json();
const completedTasks = data.filter(task => task.completed);
return completedTasks.length;
} catch (error) {
console.error("Error fetching data:", error);
return 0; // Default value in case of error
}
}

// Sample Usage
const endpoint = "https://jsonplaceholder.typicode.com/todos";
console.log(await fetchAndCountCompletedTasks(endpoint)); // Output: Total number of completed tasks
```

Solution Explanation:

- We define an `async` function `fetchAndCountCompletedTasks` to handle asynchronous operations.
- Inside the function, we use `fetch` to make a request to the specified API endpoint and `await` its response. Then, we extract JSON data from the response using `response.json()` and `await` it.
- After obtaining the data, we filter out the completed tasks using the `filter` method.
- Finally, we return the length of the filtered array, which represents the total number of completed tasks.

These are just a glimpse of the diverse challenges and solutions you can expect to encounter and master with our JavaScript assignment help services. Whether you're a beginner venturing into the world of JavaScript or an experienced developer seeking to refine your skills, programminghomeworkhelp.com is here to guide you every step of the way. Stay tuned for more insightful posts and feel free to reach out for personalized assistance tailored to your learning journey. Happy coding!