Maps

// a map is an object that associates keys and values
var person = Map<String, String>();
// To initialize the map, do this:
person['firstName'] = 'Nicola';
person['lastName'] = 'Tesla';
print(person); //Print: {firstName: Nicola, lastName: Tesla}
print(person['lastName']); //Print: Tesla
var nobleGases = {
  // Key: Value
  2: 'helium',
  10: 'neon',
  18: 'argon',
};