JavaScript Interview Test

Follow this requirements each in a separate branch, named for example step1

Usage

When you are done, simply do the following to know if you passed (or failed):

$ npm test

Create an event emitter that goes like this:

const emitter = new Emitter();

Its instance allows you to subscribe to some event by passing a callback function

emitter.subscribe('myEvent', firstArgument => console.log('a callback!'));

...any times you want...

emitter.subscribe('myEvent', (firstArgument, secondArgument) => console.log('another callback!'));

You can emit the event you want and pass any number of arguments

emitter.emit('myEvent', 'firstArgument', 'secondArgument');

Make the return from the subscribe method to return a function that allows you to release that subscription:

const sub1 = emitter.subscribe('myEvent', () => console.log('a callback!'));
sub1();

...but all other subscriptions shall remain intact

Make the emit method return an array with every return value for each subscription callback

Good luck! 💪🏼💪🏼💪🏼