Modern JavaScript from the Beginning - Second Edition - Callbacks

This video tutorial covers the concept of callbacks in JavaScript, including their use in event listeners and asynchronous programming. It explains common mistakes when using callbacks and demonstrates how to create and fetch posts using callbacks to handle asynchronous operations. The tutorial concludes with an introduction to making HTTP requests, setting the stage for further exploration of network programming in JavaScript.

What is the purpose of a callback function in event listeners?

• To style HTML elements

• To pass a function as an argument to be executed later

• To immediately execute a function

• To create a new event

What common mistake do beginners make when passing a callback function?

• Adding parentheses, causing immediate invocation

• Forgetting to define the function

• Not using a return statement

• Using the wrong event type

Which of the following is an example of an asynchronous callback?

• Array.prototype.forEach

• Array.prototype.map

• setTimeout

• String.prototype.split

Why is setTimeout used in the example of fetching posts?

• To immediately display posts

• To simulate network delay

• To sort the posts

• To delete old posts

What issue arises when creating a post without a callback?

• The new post is not displayed

• The post is duplicated

• The server crashes

• The post is not created

How does using a callback solve the issue of post display timing?

• By removing old posts first

• By increasing the server speed

• By ensuring the new post is added before displaying

• By delaying the creation of the post

What is the role of the 'CB' function in the createPost example?

• To update a post

• To execute after the post is created

• To fetch data from the server

• To delete a post

What is a common naming convention for a callback function parameter?

• cb

• executeNow

• callbackFunction

• functionName

What is the main advantage of using callbacks in asynchronous programming?

• They reduce the need for functions

• They make code run faster

• They allow for non-blocking operations

• They simplify code structure

In the context of the video, what is the next topic to be covered after callbacks?

• Advanced CSS techniques

• JavaScript frameworks

• Database management

• HTTP requests