2694. Event Emitter | JavaScript Pub/Sub Pattern

Welcome to Day 28 of the 30 Days of JavaScript challenge! 📆

In today's challenge, we build an Event Emitter — a core part of the Publisher/Subscriber pattern. Learn how to manage events and subscribe/unsubscribe effectively! 🔥

📌 What You’ll Learn:
✅ How to create your own event emitter in JavaScript
✅ Subscribe to events and trigger them with emit
✅ Unsubscribe from events to prevent memory leaks
✅ Building reusable and decoupled code with the Pub/Sub pattern

🔗 LeetCode Problem:
https://leetcode.com/problems/event-emitter

💡 Real-world use case: Custom event handling in frameworks, user input events, or server-client communication.

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