let cities = [
  { name: "Bali", flightHours: 10 },
  { name: "London", flightHours: 3 },
  { name: "New York", flightHours: 6 },
  { name: "Prague", flightHours: 3 }
];


let cityBreakOptions = cities
  .filter((city) => city.flightHours < 5)
  .map((city) => city.name);

console.log(cityBreakOptions);