doyle-flutter

void main(){
  
  final m1 = Model(0, b:1);
  m1.a;
  m1.b;
  
  final m2 = Model.named(10);
  m2.a;
  m2.b;
  

doyle-flutter

void main(){
  
  void a() => print("a");
  void b(){
    DateTime start = DateTime.now();
    DateTime now = start;
    while(now.difference(start).inSeconds < 5) {
      now = DateTime.now();
    }
    print("b");

doyle-flutter

void main(){
  
  // new OnlyTemplete();  // err -> only class
  
  OnlyTemplete obj1 = Obj1();
  obj1.func();
  obj1.func2();
  obj1.func3();
  // obj1.func4(); // err -> only  obj1
  

doyle-flutter

void main(){
  
  Templete t_obj = Obj();
  t_obj.a;
  t_obj.func();
  // t_obj.b; // err -> only Obj 
  
}

class Templete{

doyle-flutter

void main(){
  
  Parent p1 = Parent();
  Child c1 = Child();
  Parent pc1 = Child();
  
  p1.a;
  // p1.b; // err -> only child
  p1.func();
  p1.func3();

doyle-flutter

void main() {

  new Object();
  Object();
  
  Model().a;
  Model().func();
  
  Model().func2();
  Model().func3();

doyle-flutter

void main() {
  /// type
  int a = 0;
  double a2 = 0.2;
  
  String b = "b";
  String b2 = "bOb";
  
  bool c = true;
  bool c2 = false;

doyle-flutter

void main(){
  
  /// 1
  void func0(){ 
    // ...
  }
  void func1(){
    // ...
    return;
  }

doyle-flutter

void main(){
  
  /// 1
  var data0 = 0;
  dynamic data1 = 1;
  int data2 = 2;
  final data3 = 3;
  const data4 = 4;
  
  

doyle-flutter

import 'package:audioplayers/audioplayers.dart';
import 'package:flutter/material.dart';

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) => MaterialApp(
    home: MainPage(),
  );