fengyfei

mixin WorkMixin {
  void work();

  void start() {
    this.work();
  }
}

class Updater with WorkMixin {
  @override

fengyfei

// https://github.com/npm/download-counts

import 'dart:html';

const npmDownloadBase = 'https://api.npmjs.org/downloads/point/';

void fetchDownloadCounts({String repo='koa', String period='last-week'}) async {
  var resp = await HttpRequest.getString('$npmDownloadBase${period}/$repo');
  print(resp);
}

fengyfei

<link rel="stylesheet" href="https://unpkg.com/material-components-web@latest/dist/material-components-web.min.css">
<link rel="stylesheet" href="https://fonts.googleapis.com/icon?family=Material+Icons">

<p>
	<button class="mdc-button mdc-button--raised">
		Raised Button
	</button>
</p>

<p>

fengyfei

package main

import (
	"fmt"
	"sync"
)

type (
	Executor interface {
		Execute() error

fengyfei

import 'dart:async';

main() {
	Future<int> future = Future(() => 1024);

  future.then((val) => print(val))
    .catchError((err) => print(err));
  
  print("Finished!");
}

fengyfei

import 'dart:async';

main() async {
	Future<int> future = Future(() => 1024);

  try {
    print(await future);
  } catch(err) {
    print(err);
  }

fengyfei

import 'dart:core';
import 'dart:async';

Future<bool> validateSender = Future<bool>.delayed(Duration(seconds: 1), () {
  print('validate sender...');
  
  return true;
});

Future<bool> validateReceiver = Future<bool>.delayed(Duration(seconds: 3), () {

fengyfei

import 'dart:core';
import 'dart:async';

Future<bool> exception = Future<bool>.delayed(Duration(seconds: 1), () {
  print('Somehow, a exception happend...');
  
  throw 'Just a Exception, freeze!';
});

Future procedure = Future(() {

fengyfei

import 'dart:async';

main() {
  StreamController controller = StreamController();
  controller.stream.listen((val) {
    print('Event received: $val');
  }, onDone: () {
    print('Stream done');
  });
  

fengyfei

import 'dart:async';

main() {
  StreamTransformer transformer = StreamTransformer<num, num>.fromHandlers(
    handleData: (num val, EventSink sink) {
      sink.add(val + 1);
    }
  );
  StreamController controller = StreamController<num>();
  Stream transformed = controller.stream.transform(transformer);