const data = {
  name: '',
  age: 0,
  city: null,
  country: undefined,
  isActive: false
};

const getName = () => data.name || 'Unknown';
const getAge = () => data.age ?? 25;
const getCity = () => data.city || 'Default City';
const getCountry = () => data.country ?? 'Default Country';
const getStatus = () => data.isActive || 'inactive';

console.log(`${getName()}-${getAge()}-${getCity()}-${getCountry()}-${getStatus()}`);