Mapping an array of objects in Angular using HttpClient and observables

Is there a more efficient way to map each object of the result (Rxjs Observable) to another object when querying an array of objects using angular HttpClient?

Currently, I'm implementing it like this but is there a way to eliminate the need for "double mapping"?

In this scenario, the desired outcome should be Observable<Entry[]> with the constructor invoked for each Entry-object:

public getList(): Observable<Entry[]> {
  const url = "/entries/";
  return this.httpClient.get<Entry[]>(url)
    .map((entries: any[]) => entries.map((e) => new Entry(e)));
}

Answer №1

The most effective approach is to map both the observable and the array, ensuring that all members of Entry are properly accounted for. This is especially important if Entry contains additional properties not provided by the api, or if any data needs to be converted before use (for example, through a constructor function in Entry). If these conditions do not apply, mapping may not be necessary.

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