In my exploration of Angular, I recently learned about the distinctions between Observables and Promises. A key benefit of observables is their "lazy" nature - they only initiate a call when subscribed to. However, are there any scenarios where you wouldn't want to subscribe to an observable?
Imagine a unique service that performs various tasks such as:
interface Bar {
uuid: string;
}
public fetchDataFromApiEndpoint(): Observable<Bar> {
return this.http.get<Bar>('...')
}
Now, if you find yourself needing to append a unique identifier to the server response that you want to utilize in multiple locations, consider creating another service function like:
interface BarExtended extends Bar {
modifiedAt: number;
}
public fetchAndEnhanceDataFromApiEndpoint(): Observable<BarExtended> {
return this.fetchDataFromApiEndpoint().pipe(map(item => item.modifiedAt = Date.now()))
}
This approach allows you to enhance the data without subscribing directly to the Observable.
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