What are custom event emitters in JavaScript?

What are custom event emitters in JavaScript?

Custom event emitters are objects that allow you to create and manage your own events in JavaScript.

How do I create a custom event emitter?

You can create a custom event emitter by defining a class that includes methods for adding, removing, and emitting events.

Can you show me a simple 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 custom event emitters?

Custom event emitters are useful for decoupling components, handling asynchronous events, and creating modular code.