Question from the Introduction to RxJS test

How is this way of doing called? ```ts interface UserData { [key: string]: any; } class UserDataService { private userData: BehaviorSubject<UserData> = new BehaviorSubject({}); private userData$: Observable<UserData> = this.userData.asObservable(); public setUserData(userData: UserData) { this.userData.next(userData); } public getUserData(): Observable<UserData> { return this.userData$; } public getUserDataByKey(key: string) { return this.userData$.pipe(map((userData) => userData[key])); } } ```

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How this way of doing is called?

interface UserData {
  [key: string]: any;
}

class UserDataService {
  private userData: BehaviorSubject<UserData> = new BehaviorSubject({});
  private userData$: Observable<UserData> = this.userData.asObservable();

  public setUserData(userData: UserData) {
    this.userData.next(userData);
  }

  public getUserData(): Observable<UserData> {
    return this.userData$;
  }

  public getUserDataByKey(key: string) {
    return this.userData$.pipe(map((userData) => userData[key]));
  }
}
Author: Amine BouchamStatus: PublishedQuestion passed 89 times
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