How do you write an event emitter base class that allows you to add event listen

How do you write an event emitter base class that allows you to add event listeners?

Question Posted / pulak pranay

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How do you write an event emitter base class that allows you to add event listeners?..

Answer / Prakhar Bajpai

Here is a simple example of an EventEmitter base class in JavaScript: nnclass EventEmitter {n constructor() {n this._events = {};n }nn emit(event, ...args) {n if (!this._events[event]) return;n this._events[event].forEach(listener => listener.apply(this, args));n }nn on(event, listener) {n if (!this._events[event]) this._events[event] = [];n this._events[event].push(listener);n }nn off(event, listener) {n if (this._events[event]) {n const index = this._events[event].indexOf(listener);n if (index !== -1) this._events[event].splice(index, 1);n }n }n}n You can use it like this:nnconst myEmitter = new EventEmitter();nmyEmitter.on('sayHello', () => console.log('hello'));nmyEmitter.emit('sayHello');

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