mplacona

import 'package:unittest/unittest.dart';
import '../bin/singleton_pattern.dart';

void main(){
  test("'new' shouldn't be able to create a new instance of SingleObject", (){  
    expect(() => (new SingleObject()), throwsA(new isInstanceOf<NoSuchMethodError>()));
  });
  
  test("Should return and instance of SingleObject", (){
    expect(() => SingleObject.getInstance(), returnsNormally);

mplacona

class SingleObject{
  static final SingleObject _instance = new SingleObject._internal();

  static SingleObject getInstance(){
    return _instance;
  }
  
  void showMessage(){
    print("Hello World!");
  }

mplacona

void main() {
  //Get the only object available
  SingleObject object = SingleObject.getInstance();
  
  // this would cause a compilation error
  //SingleObject singleObject = new SingleObject();
  
  //show the message
  object.showMessage();
}

mplacona

class Gists{
    // instance variable for user
    String user;
    getGistsForUser(String user){
      this.user = user; 
      var url = "https://api.github.com/users/${this.user}/gists";
      http.get(url)
        .then(_processResults)
        .catchError(_handleError);
    }

mplacona

import 'package:http/http.dart' as http;
import 'dart:convert';
import 'dart:io';

class Gists{
    // instance variable for user
    String user;
    getGistsForUser(String user){
      this.user = user; 
      var url = "https://api.github.com/users/${this.user}/gists";

mplacona

import 'package:http/http.dart' as http;
import 'dart:convert';
import 'dart:io';
import 'dart:async';

class Gists{
    // instance variable for user
    String user;
    Future getGistsForUser(String user){
      this.user = user; 

mplacona

import 'dart:async';
import 'package:http/http.dart' as http;


Future makeRequest(String url) => http.get(url)
    .then((res) => res.body);

void main() {
    makeRequest('http://www.google.com')
        .then((value) => print(value))

mplacona

import 'dart:io';
import 'dart:async';

Future createFile(String fileName, String text){
    return new File(fileName).create()
            .then((File file){
                file.writeAsStringSync(text);
                return 'the file has been created with "$text" as its content';
            });
}

mplacona

<link rel="import" href="../components/polymer/polymer.html">

<polymer-element name="my-element">

  <template>
    <style>    
      #google_map_search {
        left: 450px;
        top: 230px;
        position: absolute;

mplacona

function heartbeat(){
	if(document.querySelector('.demo--completed') != null){
		eventFire(document.querySelector('.demo__restart'),'click');
	}
    setTimeout(heartbeat,1000);
}
 
 
function eventFire(el, etype){
  if (el.fireEvent) {