Websocket in Angular 4 and RxJS confusion

Question

I am trying to learn RxJS with websockets and Angular 4, and found a good example here. I\'m hoping someone can help explain the example as a few things are confusing.

Answer 1

1. Reuseability
2. so you can unsubscribe from observable which in turn closes the connection

3. in the example you gave it would probably be something like (when you have a instance of chatService)

   let sub = chatService.messages.subscribe(()=>{ 
   // do your stuff 
   });
   
   // some where in your code
   sub.unsubscribe() // this will close the connection
   

4. already answered in 3