Behavior and Replay Subjects
Explore how BehaviorSubject buffers the latest value for new subscribers and how ReplaySubject stores multiple past values to share with new observers. Understand practical use cases like user authentication and shopping carts where these subjects improve state management in reactive JavaScript applications.
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Behavior Subject
BehaviorSubject is a special type of Subject that buffers the latest emitted value and pushes that value to every new Observer that subscribes to it. As simple as that.
The following code illustrates a simple implementation of BehaviorSubject, which must be initialized with a default value in order to fulfill its purpose.
In a group chat room, every new user can be greeted with a default Welcome message. After some chit chat between the initial users, someone who is late to the party always decides to join. However, the chat allows ...