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event-pubsub

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event-pubsub

Super light and fast Extensible ES6+ events and EventEmitters for Node and the browser. Easy for any developer level, use the same exact code in node and the browser. No frills, just high speed events!

  • 5.0.3
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What is event-pubsub?

The event-pubsub package is a Node.js module that provides a simple interface for implementing the publish-subscribe pattern. This pattern allows for the creation of a decoupled system where publishers and subscribers can communicate through events without being directly connected.

What are event-pubsub's main functionalities?

Event Emission

This feature allows you to emit events with a specified name and pass data to the event listeners. In the code sample, an event listener is set up to listen for the 'sayHello' event and emit that event with a parameter.

const EventPubSub = require('event-pubsub');
const events = new EventPubSub();

// Event listener
events.on('sayHello', name => console.log(`Hello, ${name}!`));

// Emit event
events.emit('sayHello', 'World');

Event Listening

This feature allows you to listen for events by name. When the event is emitted, the callback function is called with any data passed to the event. In the code sample, an event listener is set up to listen for the 'dataReceived' event.

const EventPubSub = require('event-pubsub');
const events = new EventPubSub();

// Event listener
events.on('dataReceived', data => console.log(`Data: ${data}`));

Once Listeners

This feature allows you to set up event listeners that will only be triggered once. After the event is emitted and the listener is invoked, the listener is removed. In the code sample, an event listener is set up to listen for the 'initialize' event and will only be triggered once.

const EventPubSub = require('event-pubsub');
const events = new EventPubSub();

// Event listener that fires once
events.once('initialize', () => console.log('Initialization complete.'));

Removing Listeners

This feature allows you to remove specific event listeners. In the code sample, an event listener is added and then removed for the 'message' event.

const EventPubSub = require('event-pubsub');
const events = new EventPubSub();

function onMessage(content) {
  console.log(`Message: ${content}`);
}

// Add and remove an event listener
events.on('message', onMessage);
events.off('message', onMessage);

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Package last updated on 26 Nov 2020

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