toddzebert

// requires https://gist.github.com/toddzebert/d41f06a7a33f5ada1557637a89278531
// requires https://gist.github.com/toddzebert/5958be630e81bb9ba16fb6931c339c88
var posts = [], data = { id: 4 };
getAuth(data, function (res) {
  data.auth = res;
  getProfile(data, function (res) {
    data.profile = res;
    getFeed(data, function (res) {
      data.feed = res;
      var getPosts = data.feed.map(post => getPost(post));

toddzebert

// requires https://gist.github.com/toddzebert/d41f06a7a33f5ada1557637a89278531
// requires https://gist.github.com/toddzebert/5958be630e81bb9ba16fb6931c339c88
var posts = [], data = { id: 4 };

var resolveAd = function(res) {
  data.ad = res;
  console.log(data);
}

var resolvePosts = function(res) {

toddzebert

Arrow Functions aka => aka Fat Arrow aka Lambdas

It's a sugary anon function with some key differences. (params) => { code }

Syntax

• No need for the function keyword
• No need for {} if the function is only a single line
• Single arguments (except rest args) don't need () but 0 args do
• return is implicit with single line functions

toddzebert

An Iterable is an object that has a method Symbol.iterator which is factory for Iterators. Native Iterables include which include Arrays, Stings, Set & Map (but not weak variants).

An Iterator includes a "pointer" for traversing an Iterable in the form of a next method.

toddzebert

// requires https://gist.github.com/toddzebert/b4465de41b0f8d317d7a685604983c36
var simAsync = function(fulfillment, rejection) {
  return new Promise( (resolve, reject) => {
    const delay = randInt(400, 200);
    setTimeout(() => { resolve(fulfillment()); }, delay);
  });
};

toddzebert

// requires https://gist.github.com/toddzebert/996e297c1c081d19378eaf5f29dc75bb
var getAuth = function(data) {
  // create a closure
  const auth = function () {
    data.auth = "Authorized"; return data;
  };
  return simAsync(auth);
};

toddzebert

// requires https://gist.github.com/toddzebert/996e297c1c081d19378eaf5f29dc75bb
var getProfile = function(data) {
  // create a closure
  const prof = function () {
    data.profile = "Profile"; return data;
  };
  return simAsync(prof);
};

toddzebert

// requires https://gist.github.com/toddzebert/996e297c1c081d19378eaf5f29dc75bb
var getFeed = function(data) {
  // create a closure
  const feed = function () {
    const a = [];
    for (let i = randInt(4, 2); i; i--) {
      a.push(randInt(90, 1));
    }
    data.feed = a;
    return data;

toddzebert

// requires https://gist.github.com/toddzebert/996e297c1c081d19378eaf5f29dc75bb
var getPost = function (data) {
  // create a closure
  const post = function () {
    return data + 100;
  };
  return simAsync(post);
};

toddzebert

// requires https://gist.github.com/toddzebert/996e297c1c081d19378eaf5f29dc75bb
// requires https://gist.github.com/toddzebert/9dc7de3ed0195dfefcc533bcba426930
var getPosts = function (data) {
  return new Promise( (resolve, reject) => {
    const getAllPosts = data.feed.map(post => getPost(post));
    Promise.all(getAllPosts)
      .then(result => {
        data.posts = result; resolve(data);
      })
      .catch(result => {