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Web / RxJs Interview questions

Difference between RXJS and Promise.

Observable return stream of data.Promise return single value.
You can subscribe and unsubscribe stream.You cannot cancel a promise.
An Observable only starts if you subscribe to it. This is why Observables are called lazy.Promise starts immediately.
Subscribe method is used for error handling which makes centralized and predictable error handling.push errors to the child promises.
Provides chaining and subscription to handle complex applications.Uses only .then() clause.

Often Observable is preferred over Promise because it provides the features of Promise and more. With Observable, it doesn't matter if you want to handle 0, 1, or multiple events.

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