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void main() {
  final result = SuccessFailure<void, void>.success(1);
  print(result.success);
  print(result.failure);
}

typedef Callback<T> = void Function(T value);

class SuccessFailure<S, F> {
  factory SuccessFailure.success([S result = null]) {

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import 'dart:async';
import 'dart:math';

import 'package:flutter/material.dart';

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

double randomBorderRadius() => Random().nextDouble() * 64;

Color randomColor() {

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import 'dart:ui';
import 'package:flutter/painting.dart';

void main() {
  window.onBeginFrame = beginFrame;
  window.scheduleFrame();
}

///
/// See more details on https://fiddle.skia.org/c/@shapes

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General links

• https://hackernoon.com/whats-revolutionary-about-flutter-946915b09514
• https://medium.com/flutter-io/why-flutter-doesnt-use-oem-widgets-94746e812510
• https://proandroiddev.com/flutter-from-zero-to-comfortable-6b1d6b2d20e
• https://www.raywenderlich.com/188257/getting-started-with-flutter
• https://medium.com/@lynxluna/flutter-how-it-got-right-4865de34852
• https://medium.com/developermind/flutter-at-jimdo-our-experience-and-fun-moments-55dccd06a0fc

Introduction

• 5x - 5 Libraries that make Flutter development easier and faster: https://medium.com/@javico2609/5-libraries-that-make-flutter-development-easier-and-faster-d51cee875c33

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void main() {
 
  try {
    int divisionPart = 0;
    int someVar = 11;
    print(someVar ~/ divisionPart);
    
  } catch (e) {
    print('Произошла ошибка $e');
    

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/// 
/// Error  - это фейл, который мы никак не предусматривали. 
/// В таких случаях приложение умирает.
/// Exception - это то, что мы закладываем в логике 
/// работы нашего приложения.
///
void main() {
 
  try {
    int products;

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void main() {
  num value = 10;
  bool isObject = value is Object;
  
  print(value.runtimeType);
  print(isObject);
  
  Object obj = value as Object;
  print(obj.runtimeType);
  

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void main() {
  for (final current in StringIterable('Hello World!')) {
    print(current);
  }

//   for (final current in 'Hello World!'.toIterable()) {
//     print(current);
//   }
}

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void main() {}

class OptimizedCollection<T> {
  void add(T item) {
    item.someUsefulAction();
  }
  void remove(T item) {

  }
}

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void main() {}

abstract class MyCollectionItem {}

abstract class MyOptimizedCollection {
  void add(MyCollectionItem item);
  void remove(MyCollectionItem item);
}

abstract class OtherCollectionItem {}