Closure in Dart

Closure.dart

// ignore_for_file: prefer_function_declarations_over_variables

void main() {
  
  String message = 'Interessante';
  print('Antes: $message');

  Function showMessage = () {
    message = 'Boto fé';
    print('Depois: $message');
  };
  showMessage();



  Function present = () {
    String welcome = 'Dale';
    print('Antes: $welcome');
 
    Function say = () {
      welcome = 'Welcome';
      print('Depois: $welcome');
    };
    return say;
  };

  Function speak = present();
  speak();
}