The Modern JavaScript Bootcamp (2019) - Callback Abstraction

The video tutorial covers the concept of abstraction in coding, focusing on simplifying complex tasks using methods and functions. It introduces the creation of a separate file, requests.js, for handling HTTP requests and explains the use of callback functions in asynchronous operations. The tutorial demonstrates implementing the callback pattern to manage data and handle errors effectively, emphasizing the importance of separating concerns in code structure.

What is the main goal of abstracting tasks into functions in app.js?

• To make the code more complex

• To make the code run slower

• To increase the number of lines of code

• To simplify the process of fetching a puzzle

Why was a new file, requests.js, created?

• To replace app.js

• To handle HTTP requests separately

• To store all JavaScript code

• To store CSS styles

What is a major issue with returning data directly from asynchronous operations?

• It can cause syntax errors

• It always returns null

• The data may not be available immediately

• It makes the code run faster

What is a callback function?

• A function that calls itself

• A function passed to another function to be executed later

• A function that returns multiple values

• A function that runs only once

How does the callback pattern help in handling asynchronous data?

• By making the code synchronous

• By allowing data to be processed once it's available

• By eliminating the need for functions

• By storing data in a global variable

What is the purpose of passing two arguments to a callback function?

• To ensure the function never fails

• To handle both errors and success data

• To make the function run faster

• To increase the complexity of the code

In the callback pattern, what does the first argument typically represent?

• The success data

• The function name

• The number of retries

• A potential error

What happens if both arguments in a callback function are defined?

• Only the first argument is considered

• This situation should not occur

• Both are processed simultaneously

• The program crashes

Why is it important to handle errors in asynchronous operations?

• To avoid using callback functions

• To increase the number of HTTP requests

• To ensure the program can respond appropriately

• To make the code look longer

What is the benefit of using lexical scope in the callback pattern?

• It allows access to variables from parent scopes

• It makes the code run slower

• It prevents any errors from occurring

• It eliminates the need for functions