Run results for: Custom Event vs PubSub Single Event

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:109.0) Gecko/20100101 Firefox/115.0

Browser: Firefox 115

Operating system: Mac OS X 10.15

Device Platform: Desktop

Date tested: 2 years ago

Test name	Executions per second
✓ PubSub	82,490 Ops/sec
Custom Event	987 Ops/sec

Tests:

Custom Event
let i = 1001; const results = []; while (--i) { window.dispatchEvent(new CustomEvent('custom:test')); }
PubSub
class PubSub { constructor() { this.events = {}; } subscribe(event, callback) { if (!this.events.hasOwnProperty(event)) { this.events[event] = []; } return this.events[event].push(callback); } publish(event, data = {}) { if (!this.events.hasOwnProperty(event)) { return []; } return this.events[event].map((callback) => callback(data)); } } const pubSub = new PubSub(); let i = 1001; const results = []; while (--i) { pubSub.publish('custom', 'test') }