kasperpeulen

void main() {
  runApp(
    MaterialApp(
      home: Scaffold(
        appBar: AppBar(title: Text('Title')),
        body: Text('Hello World'),
        floatingActionButton: FloatingActionButton(
          onPressed: () => print('Button pressed'),
          child: Icon(Icons.add),
        ),

kasperpeulen

import 'package:flutter/widgets.dart';

void main() {
  runApp(
    Directionality(
      textDirection: TextDirection.ltr,
      child: Text('Hello World!'),
    ),
  );
}

kasperpeulen

import 'package:flutter/widgets.dart';

void main() {
  runApp(Text('Hello World!'));
}

kasperpeulen

import 'dart:async';

// non-nullable state
final todos = StateStream(state: <Todo>[]);
final counter = StateStream(state: 0);

// nullable state
final selectedTodo = StateStream<Todo?>(state: null);

void main() {

kasperpeulen

import 'dart:async';

// non-nullable state
final todos = StateStream(state: <Todo>[]);
final counter = StateStream(state: 0);

// nullable state
final selectedTodo = StateStream<Todo?>();

void main() {

kasperpeulen

type Monad<A> = Array<A>;

function of<A>(a: A): Monad<A> {
  return [a];
}

function flatMap<A, B>(monad: Monad<A>, callback: (a: A) => Monad<B>): Monad<B> {
  return monad.flatMap(callback);
}

kasperpeulen

Promise.resolve(3).then(x => /* x is 3 here */)

const x = await Promise.resolve(3) // x is 3 here as well

kasperpeulen

const x = await Promise.resolve(Promise.resolve(3))
// x is 3 here
// but should be Promise.resolve(3)

kasperpeulen

const promise2 = promise1.then(x => Promise.resolve(x)) 
// promise1 and promise2 are equivalent
const promise2 = Promise.resolve(await promise1)
// promise1 and promise2 are equivalent

kasperpeulen

const a = yield* pick([1, 2]);
// a is inferred as type number

const b = yield* pick(['Foo', 'Bar'] as const);
// b is inferred as type 'Foo' | 'Bar'