class WeatherBroadcastStation {
  constructor() {
    
  }

  registerObserver(weatherStation) {
    
  }

  removeObserver(weatherStation) {
    
  }

  notifyObservers(weatherData) {
    
  }
}

class WeatherStation {
  constructor(name) {
    this.name = name;
  }

  // Update the weather data for this WeatherStation.
  update(weatherData) {
    console.log(`Weather update for ${this.name}: ${weatherData}`);
  }
}

// Usage:

// Create WeatherBroadcastStation
const weatherBroadcaster = new WeatherBroadcastStation();

// Create WeatherStations (observers)
const delhiStation = new WeatherStation('Delhi');
const mumbaiStation = new WeatherStation('Mumbai');

// Register WeatherStations to WeatherBroadcastStation
weatherBroadcaster.registerObserver(delhiStation);
weatherBroadcaster.registerObserver(mumbaiStation);

// Notify Weather Stations with some weather data
weatherBroadcaster.notifyObservers('Sunny with a chance of rain');

// Output:
// Weather update for Delhi: Sunny with a chance of rain
// Weather update for Mumbai: Sunny with a chance of rain