Web / Angular Interview questions
Difference between Promises and Observable.
|A Promise handles only one event when an async operation completes or fails.||An Observable is like a Stream and accepts 0 or more (multiple) events where the callback is called for each event.|
|Promise doesn't support cancelation.||Observables are cancelable.|
|Promises execute immediately on creation.||Observables are declarative and computation does not start until subscription.|
|Promises provide only one value.||Observables provide many values.|
|Promises push errors to the child promises for error handling.||Observables subscribe() is responsible for handling errors that provides centralized and predictable error handling.|
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