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var observableStream = Rx.Observable.create(function (observer) {
  var url1 = 'http://hello-universe.com';
  var url2 = 'http://hello-world.com';
  var defaultValue = {};
  
  observer.onNext(defaultValue);
    
  $.get(url1).then(function(data) {
    observer.onNext(data);
    return $.get(url2);

codemilli

var PromiseArray = [];

el.addEventListener('scroll', function(e) {
  PromiseArray.push(new Promise(...));
  forEachForPromise();
});

function forEachForPromises() {
  PromiseArray.filter(function(promise) {
    promise.then(function(data) {

codemilli

$.get('http://get-user-info.com').then(function(user) {
  if (user.didPay) {
    showSomethingCool();
  }
});

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el.addEventListener('scrollWhenScrollNotAtTop', realCallback);
$.ajax('http://get-user-info.com').ifUserDidPay(showSomethingColl);

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{"answers":["function(console) {\n\tvar names = [\"Ben\", \"Jafar\", \"Matt\", \"Priya\", \"Brian\"],\n\t\tcounter;\n\n\tfor(counter = 0; counter < names.length; counter++) {\n\t\tconsole.log(names[counter]);\n\t}\n}\n\t\t","function(console) {\n\tvar names = [\"Ben\", \"Jafar\", \"Matt\", \"Priya\", \"Brian\"];\n\n\tnames.forEach(function(name) {\n\t\tconsole.log(name);\n\t});\n}\n\t\t","function() {\n\tvar newReleases = [\n\t\t{\n\t\t\t\"id\": 70111470,\n\t\t\t\"title\": \"Die Hard\",\n\t\t\t\"boxart\": \"http://cdn-0.nflximg.com/images/2891/DieHard.jpg\",\n\t\t\t\"uri\": \"http://api.netflix.com/catalog/titles/movies/70111470\",\n\t\t\t\"rating\": [4.0],\n\t\t\t\"bookmark\": []\n\t\t},\n\t\t{\n\t\t\t\"id\": 654356453,\n\t\t\t\"title\": \"Bad Boys\",\n\t\t\t\"boxart\": \"http://cdn-0.nflximg.com/images/2891/BadBoys.jpg\",\n\t\t\t\"uri\": \"http://api.netflix.com/catalog/titles/movies/70111470\",\n\t\t\t\"rating\": [5.0],\n\t\t\t\"bookmark\": [{ id: 432534, time: 65876586 }]\n\t\t},\n\t\t{\n\t\t\t\"id\": 654

codemilli

var btn = document.getElementById('button');

btn.addEventListener('click', function () {
  if (window.__VALID_USER__) {
    console.log('Hello, Universe'); 
  }
});

codemilli

el.addEventListener('scroll', function () {
  if (pageYOffset !== 0) {
    realCallback();
  }
});

el.addEventListener('touchmove', function () {
  if (pageYOffset !== 0) {
    realCallback();
  }

codemilli

var arr = [1, 2, 3, 4, 5, 6];

var filteredArr = arr.filter(function(item) {
  return item % 2 === 0;
}); 

var mappedFilteredArr = filteredArr.map(function (item) {
  return item * 2;  
});

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var btn = document.getElementById('button');

btn.addEventListener('click', function () {
  console.log('Hello, Universe');
});

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function listen(element, eventName) {
    return new Observable(observer => {
        // Create an event handler which sends data to the sink
        let handler = event => observer.next(event);

        // Attach the event handler
        element.addEventListener(eventName, handler, true);

        // Return a function which will cancel the event stream
        return () => {