Producer

A producer have the task of producing the values emitted by an Observable

 class Producer {
    constructor(){
      this.i = 0;
    }

    nextValue(){
      return this.i++;
    }
 }

And to use it

  let stream$ = Observable.create( (observer) => {
    const producer = new Producer();
    observer.next( producer.nextValue() )
    observer.next( producer.nextValue() )
  })

In the Observable Anatomy chapter there is no Producer in the examples but most Observables that are created by a helper method will have an internal Producer producing values that the observer emits using the observer.next method

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