var name = 'Voyager I';
var year = 1977;
var antennaDiameter = 3.7;
var flybyObjects = ['Jupiter', 'Saturn', 'Uranus', 'Neptune'];
var image = {
  'tags': ['saturn'],
  'url': '//path/to/saturn.jpg'
};

if(year >= 2001) {
  print('21st century');
} else if (year >= 1901) {
  print('20th century');
}

for(var object in flybyObjects) {
  print(object);
}

for(int month = 1; month <= 12; month++) {
  print(month);
}

while(year < 2016) {
  year += 1;
}