Chuỗi

void main() {
  String greeting = 'Hello, Dart!';
  print(greeting);
}

void main() {
  String withSingleQuotes = 'Learning Dart';
  String withDoubleQuotes = "Programming is fun";
  
  print(withSingleQuotes);
  print(withDoubleQuotes);
}

void main() {
  String firstName = 'Dart';
  String lastName = 'Developer';
  
  // Nối các chuỗi
  String fullName = firstName + ' ' + lastName;
  print(fullName);
}