HosseinYousefi

extension type Intersection<T, U>._(dynamic _value) {
  factory Intersection(dynamic value) {
    if (value is! T && value is! U) {
      throw StateError('Invalid type');
    }
    return Intersection(value);
  }
}

HosseinYousefi

import 'dart:async';

class MyStreamController {
  final MyStream stream;
  
  MyStreamController() : stream = MyStream();
  
  void add(int i) {
    Future.microtask(() {
      stream.lastElement = i;

HosseinYousefi

class A {
  static int g() {
    print('happens');
    return 42;
  }
  static final int f = g();
}

void main() {
  print('hmm?');

HosseinYousefi

import random

total = 0
boys = 0
for _ in range(10000):
    population = [(random.choice(['B', 'G']), random.choice(['B', 'G'])) for _ in range(1000)]
    mr_smith_kids = random.choice(population)
    if mr_smith_kids == ('G', 'G'): # We know this did not happen
        continue
    total += 1

HosseinYousefi

import 'package:flutter/material.dart';

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

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: MyHomePage(),
    );

HosseinYousefi

import 'package:flutter/material.dart';

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

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Builder(
        builder: (context) {

HosseinYousefi

String _value = 'D'; // is not in your hand

mixin B on Z {
  String get value => _value;
  String get cachedValue;
  
  @override
  void call() {
    print('in B: $value, $cachedValue');
    super.call();

HosseinYousefi

import 'package:flutter/material.dart';

void main() {
  runApp(MaterialApp(home: A()));
}

class A extends StatefulWidget {
  @override
  _AState createState() => _AState();
}

HosseinYousefi

import 'package:flutter/material.dart';

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

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: MyHomePage(),
    );

HosseinYousefi

import 'dart:async';

Future<void> wait(int millis) =>
  Future.delayed(Duration(milliseconds: millis));

Stream<String> userTyping() async* {
  await wait(100);
  yield 'h';
  await wait(100);
  yield 'he';