The biggest advantage of Docker is the assurance it gives the developer that the application will run smoothly on any Linux machine irrespective of the fact that the machine itself has customized settings that may or may not be different from the machine in which the codes were created and deployed initially.
Docker is an open source tool that makes it easier to deploy apps with the help of containers. Applications are packaged in containers and then shipped to whichever platform it is meant to work in.
Calls of the next are the most common as they actually deliver the data to it’s subscribers. During observable execution there can be an infinite calls to the
observer.next(), however when
observer.complete() is called, the execution stops and no more data will be delivered to the subscribers.