Dependency free pubsub model based library

const pubsub = require('pubsub-simplified-js');

const eventFun1 = data => console.log('do something with the data');
const eventFun2 = data => console.log('do something with the data here also');

const subscriber1st = pubsub.subscribe('eventName1', eventFun1);
const subscriber2nd = pubsub.subscribe('eventName1', eventFun2);
const subscriber3rd = pubsub.subscribe('eventName2', eventFun1);

pubsub.publish('eventName1', payloadRequiredByCallbackHere');

returns:
nothing

subscriber1st.unsubscribe();

returns:
nothing

pubsub.removeAll()

returns:
nothing

pubsub.remove('eventName1')

returns:
nothing

pubsubClass.detachFromAllEvents(eventFun1)

returns:

1. true -> if such function is associated with any event and detached successfully
   
2. false -> if no such function is associated with any event
   

pubsubClass.getSubscribers(eventName1)

returns:

1. [] -> if no sch event is there (any event can't exist without <= 1 callback associated with it)
   
2. [cb1, cb2, ......] -> all callbacks associated
   

pubsubClass.getSubscribersCount(eventName1)

returns:
number