Web / RxJs Interview questions
Difference between RXJS and Promise.
| RXJS. | 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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