SOURCE

const pubsub = {};

(function(myObject) {
  const topics = {};
  let subUid = -1;
  myObject.publish = function(topic, args) {
    if(!topics[topic]) {
      return false
    }
    const subscribers = topics[topic];
    let   len = subscribers ? subscribers.length : 0
    while(len--) {
      subscribers[len].func(topic, args)
    }
    return this;
  }
  myObject.subscribe = function(topic, func) {
    if(!topics[topic]) {
      topics[topic] = []
    }
    const token = (++subUid).toString()
    topics[topic].push({
      token,
      func
    })
    return token
  }
  myObject.unsubscribe = function(token) {
    for(var m in topics) {
      if(topics[m]) {
        for(var i = 0, j = topics[m].length; i < j; i++) {
          if(topics[m][i].token === token) {
            topics[m].splice(i, 1)
            return token
          }
        }
      }
    }
    return this
  }
}(pubsub));

const getCurrentTime = function() {
  const date = new Date(),
        m = date.getMonth() + 1,
        d = date.getDate(),
        y = date.getFullYear(),
        t = date.toLocaleTimeString().toLowerCase()
  return (`${m}/${d}/${y} ${t}`)
}

function addGridRow(data) {
  console.log(`update grid component with: ${data}`)
}

function updateCounter(data) {
  console.log(`data last updated at: ${getCurrentTime()} with ${data}`)
}

const gridUpdate = function(topic, data) {
    console.log(89898989)
  if(data !== undefined) {
    addGridRow(data)
    updateCounter(data)
  }
}


const gridUpdate1 = function(topic, data) {
  console.log(121212121)
  if(data !== undefined) {
    addGridRow(data)
    updateCounter(data)
  }
}

const subscriber = pubsub.subscribe('newDataAvailable', gridUpdate)
const subscriber1 = pubsub.subscribe('newDataAvailable', gridUpdate1)
pubsub.unsubscribe(subscriber1)
pubsub.publish('newDataAvailable', {
  summary: 'Apple made $5 billion',
  identifier: 'APPL',
  stockPrice: 570.91
})

pubsub.publish('newDataAvailable', {
  summary: 'Microsoft made $20 million',
  identifier: 'MSFT',
  stockPrice: 30.85
})

/*
var messageLogger = function(topics, data) {
  console.log(`Logging: ${topics} : ${data}`)
}

var subscription = pubsub.subscribe('inbox/newMessage', messageLogger)

pubsub.publish('inbox/newMessage', 'hello world')
pubsub.publish('inbox/newMessage', ['test', 'a', 'b', 'c'])
pubsub.publish('inbox/newMessage', {
  sender: 'hello@google.com',
  body: 'Hey again!'
})

pubsub.unsubscribe(subscription)

pubsub.publish('inbox/newMessage', 'Hello! are you still there?')
*/