MelvinRB27

void main() {
  emit().listen((value){
    print('Valor: $value');
  });
}


Stream<int> emit() async* {
  
  final numbers = [1, 2, 3, 4, 5];

MelvinRB27

void main() {
  emit().listen((value){
    print('Valor: $value');
  });
}


Stream<int> emit(){
  return Stream.periodic(Duration(seconds: 1), (value){
    return value;

MelvinRB27

void main() async {
  try {
    final value = await httpGet("melvin");
    print(value);
  } on Exception catch (err) {
    print('Hubo un error de Exception: $err');
  } catch (err) {
    print('OOPS! Error: $err');
  } finally {
    print('Se completó el try-catch');

MelvinRB27

void main() async {
  try {
    final value = await httpGet("melvin");
    print(value);
  } catch (err) {
    print('Error: $err');
  }
}

Future<String> httpGet(String url) async {

MelvinRB27

void main() {
  httpGet("melvin").then((data) => {
    print(data)
  }).catchError((err) => {
    print("error: $err")
  });
}


Future<String> httpGet(String url){

MelvinRB27

void main() {
  final batman = Murcielago();
  batman.volar();
  batman.caminar();
  
  
  final donald = Pato();
  donald.nadar();
  donald.caminar();
  donald.volar();

MelvinRB27

void main() {
  final batman = Murcielago();
  batman.volar();
  batman.caminar();
  
  
  final donald = Pato();
  donald.nadar();
  donald.caminar();
  donald.volar();

MelvinRB27

void main() {
  final ghero = GoodHero(name: 'Iron Man', power: 'Rich', isAlive: false);
  print(ghero);

  final bhero = BadHero(name: 'Flash', power: 'Fast', isAlive: true);
  print(bhero);
}

enum HeroType { good, bad }

MelvinRB27

void main() {
  
  final v = Square(side: -27);
  //v.set(-2.5);
  print( v.area );
  
}

class Square {
  double _side;

MelvinRB27

void main() {
  final Map<String, dynamic> responseHttp = {
    'heroes': [
      {'name': 'Spider Man', 'power': 'Trepar', 'isAlive': true},
      {
        'name': 'Iron Man',
        'power': 'Traje de alta tecnología',
        'isAlive': false
      },
      {