import Foundation

let weatherData: [(city: String, description: String, temperature: Double)] = [
  (city: "Zurich", description: "cloudy", temperature: 18.5),
  (city: "Bern", description: "sunny", temperature: 22.1),
  (city: "Geneva", description: "rainy", temperature: 15.3),
  (city: "Basel", description: "sunny", temperature: 24.7),
  (city: "Lucerne", description: "foggy", temperature: 11.0),
  (city: "Lugano", description: "sunny", temperature: 31.2),
  (city: "Lausanne", description: "cloudy", temperature: 19.8),
  (city: "Chur", description: "snowing", temperature: -2.5),
  (city: "Davos", description: "snowing", temperature: -5.1),
  (city: "Locarno", description: "thunderstorm", temperature: 27.4),
]

func weatherStation(city: String, description: String, temperature: Double) -> (
  String, String, Double
)? {
  if temperature >= 20 {
    let dateTimeString = Date.now.formatted(date: .abbreviated, time: .shortened)
    return (description, dateTimeString, temperature)
  } else {
    return nil
  }
}

for weather in weatherData {
  weatherStation(city: weather.0, description: weather.1, temperature: weather.2)
}