Differentiate between Observables, Subjects, ReplaySubjects, Behaviour Subjects?

Question

Please share some examples/code snippets. I read the code but my understanding is not that clear.

Answer 1

You can picture them all as streams.

• Observable: Subscribe to it to get the values
• Subject: Same but you also have control of the values that you want to emit into it (can subscribe to it but also emit)
• ReplaySubject: Same as subject but will keep track of the N latest emitted values and every time you subscribe to it, it'll emit those N values
• BehaviorSubject: Subject where you have to set a default value, if you subscribe to it before anything has been emitted you'll get the default value

Observable and Subject: If you emit a value and subscribe to one of them after that, you'll not get the latest value emitted, you'll have to wait for a new value to be emitted before you're notified

ReplaySubject and BehaviorSubject: Even if you emit a value and then subscribe to one of them, you'll directly get the latest emitted value as soon as you subscribe.