marcel-ploch

class TrafficLight {
  static String updateLight(String currentState) {
    return "Solution";
  }
}

void main() {
  assert(TrafficLight.updateLight("green") == "yellow",
      "Not correct answer for green");
  print("Color is yellow");

marcel-ploch

// Erweitere die Klasse string um die NumberParsing Extension
extension NumberParsing on String {
 int parseInt() {
   return int.parse(this);
 }
 String parseFloat() {
   return double.parse(this).toStringAsFixed(2);
 }
 String changeDirection() {
  return this.split('').reversed.join();

marcel-ploch

class Vehicle {
  String? make;
  String? model;
  int? manufactureYear;
  int? vehicleAge;
  String? color;

  int get age {
    return vehicleAge ?? 0;
  }

marcel-ploch

add2Numbers(int number1, {required int number2}) {
 return number1 + number2;
}

add2NumbersNotReq([int number1 = 5, int number2 = 10]) {
 return number1 + number2;
}

add2NumbersNamedOptional({required int number1, int? number2}) {
  return number1 + (number2 ?? 0);

marcel-ploch

Future<void> printOrderMessage() async {
  print('Awaiting user order...');
  var order = await fetchUserOrder();
  print('Your order is: $order');
}
Future<String> fetchUserOrder() {
  // Imagine that this function is more complex and slow.
  return Future.delayed(const Duration(seconds: 4), () => 'Large Latte');
}
void main() async {

marcel-ploch

// Erweitere die Klasse string um die NumberParsing Extension
extension StringParsing on String {
  String changeDirection() {
    return this.split('').reversed.join();
  }
  // ···
}

class Person {
  String name = '';

marcel-ploch

import 'package:flutter/material.dart';
import 'dart:async';
import 'dart:math';

void main() {
  runApp(const MyApp());
}

class MyApp extends StatelessWidget {
  const MyApp({Key? key}) : super(key: key);

marcel-ploch

Future<int> sumStream(Stream<int> stream) async {
  var sum = 0;
  await for (final value in stream) {
    sum += value;
  }
  return sum;
}

Stream<int> countStream(int to) async* {
  for (int i = 1; i <= to; i++) {

marcel-ploch

class User {
  String name;
  String type;
  User({required this.name, required this.type});
}


enum MyEnum {
  foo("test", "admin"),
  bar("test2", "user");

marcel-ploch

class MeinObjektPositionsParameter {
  String name = "";
  // Positions Parameter an Stelle 1
  MeinObjektPositionsParameter(this.name);
}

class MeinObjektOptionalParameterDefault {
  String name = "";
  // Positions Parameter an Stelle 1, aber optional mit default value
  MeinObjektOptionalParameterDefault([this.name = 'FOO']) ;