Event/EventEmitter

• Node.js has a built-in module, called "Events", where you can create, fire, and listen for your own events.

Task 1: Create Event Handler

• create test-event.js

    const events = require('events');
    const eventEmitter = new events.EventEmitter();

    //Create an event handler:
    const myEventHandler = function (user) {
        console.log('New User Registered. Sending activation mail!', user);
    }
    //Assign the event handler to an event:
    eventEmitter.on('register-user-event', myEventHandler);

    function createUser(){

        let userObj = { name:"Naresh", email:"nareshkumarh@live.com"};
        // TODO: Save details in users table
        // Trigger an event which should send new user activation mail.
                
        //Fire the  event:
        eventEmitter.emit('register-user-event', userObj);
    }

    createUser();

Task 3: Test

• node test-event.js

    New User Registered. Sending activation mail! { name: 'Naresh', email: 'nareshkumarh@live.com' }

Task 4: Practice: Multiple Events

• Register Multiple Event
• https://www.youtube.com/watch?v=Mk5kTO662EU&ab_channel=AllThingsJavaScript%2CLLC