Modern JavaScript from the Beginning - Second Edition - AJAX and XHR Object

The video tutorial introduces the XML HTTP Request (XHR) object and its role in making HTTP requests. It explains the historical context of XML in Ajax and contrasts it with the modern use of JSON. The tutorial provides a step-by-step guide on implementing XHR in JavaScript, including initializing requests, handling responses, and displaying data on a webpage. It also covers fetching data from APIs, using the GitHub API as an example, and emphasizes the importance of understanding API documentation.

What does AJAX stand for?

• Advanced JSON and XML

• Asynchronous JavaScript and XML

• Advanced JavaScript and XML

• Asynchronous JSON and XML

Why is JSON preferred over XML in modern web applications?

• JSON is more complex

• JSON is simpler and cleaner

• XML is not supported by browsers

• XML is faster to parse

What is the main advantage of using AJAX for HTTP requests?

• It only works with XML

• It enables requests without refreshing the page

• It allows page refreshes

• It requires no server

What is the purpose of the 'open' method in XHR?

• To parse JSON data

• To close a request

• To initialize a request

• To send data to the server

Which ready state indicates that the request is complete and the response is ready?

• 4

• 3

• 1

• 0

What method is used to send an XHR request?

• fetch()

• send()

• get()

• post()

How can you parse a JSON string into a JavaScript object?

• JSON.parse()

• JSON.objectify()

• JSON.stringify()

• JSON.convert()

What is the purpose of the 'appendChild' method in the context of this tutorial?

• To update an existing element

• To add a new element to the DOM

• To remove an element

• To fetch data from an API

What should you know about an API before using it?

• Its endpoints and data format

• Its server location

• Its programming language

• Its color scheme

What is a common use case for AJAX in web applications?

• To handle form submissions without page reloads

• To design user interfaces

• To create static web pages

• To compile JavaScript code