Angular / 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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