code4.mdx

// type Character {
public class Character {
  // name: String
  public String Name { get; }

  // homeWorld: Planet
  public async Task<Planet> GetHomeWorldAsync() {
    return await FetchHomeworldAsync(_HomeworldID);
  }

  // friends: [Character]
  public async IEnumerable<Task<Character>> GetFriendsAsync() {
    return _FriendIDs.Select(FetchCharacterAsync);
  }
}