> For the complete documentation index, see [llms.txt](https://soufatn.gitbook.io/rxjs-book/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://soufatn.gitbook.io/rxjs-book/summary/observer.md).

# Observer

The Observer object provides support for push-style iteration over an observable sequence.

The Observer and Objects interfaces provide a generalized mechanism for push-based notification, also known as the observer design pattern. The Observable object represents the object that sends notifications (the provider); the Observer object represents the class that receives them (the observer).

* [Observer methods](https://github.com/soufatn/rxjs-book/tree/bf8b6376d5d3357f915110c3a4f92267055843f3/content/observer/observer_methods/index.html)
* [Observer instance methods](https://github.com/soufatn/rxjs-book/tree/bf8b6376d5d3357f915110c3a4f92267055843f3/content/observer/observer_instance_methods/index.html)