Asynchronous Programming Quiz

What is asynchronous programming?

• A programming language

• A programming paradigm

• A programming algorithm

• A programming framework

Which of the following is a benefit of asynchronous programming?

• Improved performance

• Simplicity

• Synchronous execution

• Limited scalability

What is the main purpose of callbacks in asynchronous programming?

• To handle errors

• To perform tasks asynchronously

• To organize code

• To simplify syntax

What is the event loop in the context of asynchronous programming?

• A loop that handles user input events

• A loop that executes synchronous code

• A mechanism for handling asynchronous tasks

• A loop for rendering graphics

How does the event loop work in JavaScript?

• It executes tasks in a linear fashion, one after the other.

• It waits for all asynchronous tasks to complete before moving to the next task.

• It continuously checks the message queue and executes tasks in a non-blocking manner.

• It relies on multithreading to parallelize task execution.

What is the primary role of the message queue in the event loop?

• To store synchronous tasks.
  

• To store asynchronous tasks.

• To store user input events.

• To store callbacks for error handling.

What is a callback function in programming?

• A function that returns a value immediately

• A function passed as an argument to another function to be executed later

• A function that only handles errors in the code

• A function that executes synchronously

In asynchronous programming, what is the primary purpose of using callbacks?

• To organize code in a modular way

• To handle errors in the code

• To execute tasks concurrently

• To perform tasks asynchronously and handle their completion

Which of the following is an example of a callback in JavaScript?

• function add(a, b) { return a + b; }

• setTimeout(function() { console.log("Hello, world!"); }, 1000);

• let result = fetchData();

• const numbers = [1, 2, 3]; numbers.forEach(processNumber);

What is a Promise in JavaScript?

• A guarantee that a function will always return a value

• A representation of a value that may be available now, in the future, or never

• A function that executes synchronously

• A type of callback function