pmeskers

Testing JavaScript's native Promises

Promises are not a new concept to JavaScript, with popular implementations already provided by jQuery and Q. However, with the Promise abstraction now a built-in object in ECMAScript and appreciating more widespread browser support, it makes sense to start shifting towards this new interface.

Because of their asynchronous nature, promises can often be confusing to unit test. The purpose of this post will be to demonstrate a simple example of how one might apply TDD and build a test suite around a simple JavaScript service which returns a promise.

In the spirit of using new JS interfaces, we'll also be using the new Fetch API as our asynchronous behavior, and we'll be writing our unit tests in [Jasmine](http://jasmine.github.io/2.0/intro

mikelehen

/**
 * Fancy ID generator that creates 20-character string identifiers with the following properties:
 *
 * 1. They're based on timestamp so that they sort *after* any existing ids.
 * 2. They contain 72-bits of random data after the timestamp so that IDs won't collide with other clients' IDs.
 * 3. They sort *lexicographically* (so the timestamp is converted to characters that will sort properly).
 * 4. They're monotonically increasing.  Even if you generate more than one in the same timestamp, the
 *    latter ones will sort after the former ones.  We do this by using the previous random bits
 *    but "incrementing" them by 1 (only in the case of a timestamp collision).
 */

jaxbot

function home() {
  db.query("SELECT * FROM `posts` ORDER BY `time` DESC LIMIT 10", function(err, rows){
    render('home', { posts: rows[0] }, function(err, result){
      response.end(result);
    });
  });
}

function post(id) {
  db.query("SELECT * FROM `posts` WHERE `link` = " + db.escape(id)), function(err, rows){

wh1tney

Gist

This is a quick tutorial explaining how to get a static website hosted on Heroku.

Why do this?

Heroku hosts apps on the internet, not static websites. To get it to run your static portfolio, personal blog, etc., you need to trick Heroku into thinking your website is a PHP app. This 6-step tutorial will teach you how.

Basic Assumptions

staltz

The introduction to Reactive Programming you've been missing

(by @andrestaltz)

---

This tutorial as a series of videos

If you prefer to watch video tutorials with live-coding, then check out this series I recorded with the same contents as in this article: Egghead.io - Introduction to Reactive Programming.

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kevin-smets

Default

Powerlevel10k

JeffreyWay

alias server='open http://localhost:8000 && python -m SimpleHTTPServer'

davidcalhoun

JavaScript Best Practices

Code conventions

Closing/opening brackets

Although this isn't a problem in other languages, because of semicolon insertion, there could be problems if you don't place the bracket on the opening line:

// no:
function()
{

darktable

application: you-app-name-here
version: 1
runtime: python
api_version: 1

default_expiration: "30d"

handlers:
- url: /(.*\.(appcache|manifest))
  mime_type: text/cache-manifest