<ul><li>JavaScript engine like V8 in chrome reads JavaScript codes that we write and convert them into machine executable instructions for the browser.</li><li>JavaScript has an engine known as the JavaScript engine, that each browser implements.</li><li>The engine has two parts, namely a memory heap and a call stack.</li><li>Memory allocation happens in the memory heap, while parsing (reading) and execution takes place in the call stack.</li><li>JavaScript is a single-threaded language that can be non-blocking.</li><li>Synchronous programming means that each line of code executes in order.</li><li>Asynchronous programming enables you to run code without waiting for an earlier line to finish executing.</li><li>SetTimeout is part of Web API and not part of JavaScript.</li><li>Web API, Callback queue, and Event loop form part of the JavaScript Runtime Environment that enables us to do asynchronous programming.</li><li>The call stack recognizes there is a setTimeout function that has been set, and it is not part of JavaScript but part of web API.</li></ul>

How JavaScript works underneath the hood?

Discover more