Event-driven programming. How does it relate to Node.js?

Event-driven programming is a programming paradigm that focuses on the flow of events or actions that occur within a program. In this paradigm, the program responds to events as they occur, rather than executing code in a linear manner. This approach is particularly useful for building interactive applications, such as web applications.

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Node.js is an event-driven platform that allows developers to build scalable network applications. It uses an event loop to handle asynchronous I/O operations, allowing applications to handle a large number of concurrent connections.

In Node.js, events are handled using the EventEmitter class. This class provides a way to raise and handle events within a program. To use the EventEmitter class, you need to create an instance of it, and then use the on() method to attach event listeners to the instance. When an event occurs, the EventEmitter instance will call all registered listeners in order.

Here is an example code that demonstrates the use of EventEmitter in Node.js:

const EventEmitter = require('events');

// create a new instance of EventEmitter
const myEmitter = new EventEmitter();

// attach a listener for the 'greet' event
myEmitter.on('greet', () => {…