Dart Einstieg

main.dart

// Copyright 2015 the Dart project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license
// that can be found in the LICENSE file.
import "dart:async";

void main() {
  print(AutoMarkeExtension.fromText("Mercedes").toText());
  dynamic car = new Car("Mercedes");
  print(car);
  final car2 = Car("Mercedes", color: "blue");
  car2.printCheck();
}

class Car{
  
  dynamic name;
  String _color;
  int number = 3;
  get color => _color;
  
  Car(this.name, {color}) : _color = color;
  //geht nicht schon defined
  //Car(this.name, this.color);

  toString() => "$name ${'${_color ?? "nullcolor"}'}";
  
  Future<bool> checkCar() {
    return new Future.delayed(const Duration(seconds : 1), () => true);
  }
  
  printCheck () {
    checkCar().then((value) => print("check $value"));
    print("beforecheck".firstUpper());
  }
  
}

extension StringExtension on String{
  
  firstUpper() => this[0].toUpperCase() + this.substring(1);
  
}

enum AutoMarke{
  //Mercedes = "Mercedes", geht nicht
  Mercedes,
  BMW,
  Opel
}

extension AutoMarkeExtension on AutoMarke{
  
  toText(){
    switch(this){
      case AutoMarke.Mercedes:
       return "Mercedes";
    }
  }
  
  static AutoMarke fromText(String value){
    switch(value){
      case "Mercedes":
        return AutoMarke.Mercedes;
    }
  }
  
}