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const Observable = function(producer) {
  this.subscribe = producer
}
const intervalProducer = function(observer) {
  let counter = 0
  const unsubscribe = function() {
    clearInterval(timer)
  }
  const timer = setInterval(() => {
    try {
      observer.next(counter++)
    } catch(err) {
      unsubscribe() // <- on error we also want to unsusbcribe
      observer.error(err)
    }
  }, 1000)
  return {
    unsubscribe
  }
}
const observableInterval = new Observable(intervalProducer)
const observer = {
  next(value) { console.log(value) },
  error(err) { console.log('Error: ', err) },
  complete() { console.log('Done') }
}
const sub = observableInterval.subscribe(observer)
setTimeout(() => {
  sub.unsubscribe()
}, 6000)
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