Types of observables

RxJS is a library for reactive programming using Observables to handle asynchronous data streams. The following are the observable types that are available in RxJS:

Observable: The Observable type represents a stream of data that can be subscribed to, allowing data to be pushed to its observers over time. Observables can be created from events, arrays, timers, or any data source that can be represented as a sequence.

Subject: A Subject is a special type of Observable that allows for multicasting. It can be used to share a single stream of data among multiple observers. Observers can subscribe and unsubscribe to a Subject at any time, and new observers will receive all future values that are emitted by the Subject.

BehaviorSubject: A BehaviorSubject is a variant of a Subject that always emits its current value to new subscribers. It stores the latest value emitted and will immediately emit that value to new subscribers before they receive any other values.

ReplaySubject: A ReplaySubject is a variant of a Subject that stores a buffer of previous values and replays them to new subscribers. It allows for creating an Observable that will emit previous values to new subscribers.

AsyncSubject: An AsyncSubject is a variant of a Subject that only emits the last value in the stream to its observers, and only when the stream completes. It is useful when you only need the final value emitted by an Observable.

Operator: An Operator is a function that takes an Observable as input and returns another Observable as output. Operators can be used to transform, filter, or combine Observables, and can be chained together to create more complex data pipelines.

Overall, the different types of Observables in RxJS provide flexibility and allow for more complex data streams to be handled in a reactive and efficient manner.