freedive-cebu30

void main() {
  perform();
}

void perform() {
  task1();
  String data = task2();
  task3(data);
}

freedive-cebu30

void main() {
  perform();
}

void perform() async {
  task1();
  String data = await task2();
  task3(data);
}

freedive-cebu30

class Person {
  final String name;
  final int age;
  Person(this.name, this.age);
  
  void introduce(){
    print(name + ':' + age.toString());
  }
}

freedive-cebu30

// メソッド名と引数の型だけを定義
class Person {
  Person({ required this.greeting, required this.cal });
  final Function(String) greeting;
  final Function(int) cal;
}

void greet(String value){
  print(value + 'に挨拶!');
}

freedive-cebu30

// メソッド名と引数の型だけを定義
class Person {
  Person({ required this.greeting, required this.cal });
  final Function(String) greeting;
  final Function(int) cal;
}

main() {
  Person jojo = Person(greeting: (value) => print(value + 'に挨拶!'),
                       cal: (value) => print(value * value),

freedive-cebu30

class Person {
  String? _name;
  int? _age;

  Person(String name, int age) {
    _name = name;
    _age = age;
  }

  void introduce() {

freedive-cebu30

class Person {
  String name;
  int age;

  Person(this.name, this.age);

  void introduce() {
    print(name + ':' + age.toString());
  }
}

freedive-cebu30

class Person {
  String name;
  int age;
  
  Person(this.name, this.age);
  
  void introduce(){
    print(name + ':' + age.toString());
  }
}

freedive-cebu30

class Person {
  String? name;
  int? age;
  
  Person(this.name, this.age);
  Person.duo(){
    name = 'duo';
    age = 100;
  }
}

freedive-cebu30

class Person {
  String name;
  int age;
  
  // {}をつけている
  Person({required this.name, required this.age});
}

void main(){
  // インスタンス化する時に、nameとageを指定している