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What is Subject? List out 4 Types of Subject in RxJava

Deepika Sahu answered on December 29, 2022 Popularity 1/10 Helpfulness 1/10

answer What is Subject? List out 4 Types of Subject in RxJava

What is Subject? List out 4 Types of Subject in RxJava

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Subject means both subscriber and observer at the same time. 
With subjects in RxJava, users can transform cold observables to hot ones.
They are also used to introduce some type of local and temporary caching of the stream. 
Also, help in transforming non-reactive code to reactive if the user does not find any operator for use case creation.

Types of Subjects in RxJava:

PublishSubject: It passes incoming events to all subscribers. 
New subscribers will receive events only from the point of subscription.
BehaviourSubject: Similar to publish subject, but each new subscriber will receive the latest value of the stream, i.e., the default value.
Here, the default value of the stream provides a good user experience.
AsyncSubject: It emits only the last value of Observable, and that too only after the source observable completes emitting.
ReplaySubject: Each subscriber will receive all the events emitted by the source, regardless of at which point it is subscribed. 
If Observable emits too many items, they need to be in-memory cache.

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Contributed on Dec 29 2022

Deepika Sahu

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What is Subject? List out 4 Types of Subject in RxJava

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