What is Asynchronous Programming?

• Callbacks
• Promises
• Async/Await

Ajax & XHR Introduction

What is Ajax?

• Asynchronous JavaScript & XML
• Set of web technologies
• Send & Receive data asynchronously
• Does not interfere with the current page
• JSON has replaced XML for the most part

XmlHttpRequest (XHR) Object

• API in the form of an object
• Provided by the browsers JS environment
• Methods transfer data between client/server
• Can be used with other protocols than HTTP
• Can work with data other than XML (JSON, plain text)