What is a custom event emitter in JavaScript?

Can you explain what a custom event emitter is in JavaScript?

A custom event emitter is a design pattern that allows objects to communicate with each other by emitting and listening for events.

How do I create one in my JavaScript project?

You can create a custom event emitter by defining a class that manages event listeners and emits events when triggered.

Can you show me a simple code example?

Sure! Here's a basic example:

class EventEmitter {
    constructor() {
        this.events = {};
    }

    on(event, listener) {
        if (!this.events[event]) {
            this.events[event] = [];
        }
        this.events[event].push(listener);
    }

    emit(event, ...args) {
        if (this.events[event]) {
            this.events[event].forEach(listener => listener(...args));
        }
    }
}

This class allows you to register listeners and emit events.

What are some use cases for a custom event emitter?

Custom event emitters are useful for decoupling components in applications, handling asynchronous events, and managing state changes.