Steven Vandevelde icidasset

This article has been given a more permanent home on my blog. Also, since it was first written, the development of the Promises/A+ specification has made the original emphasis on Promises/A seem somewhat outdated.

You're Missing the Point of Promises

Promises are a software abstraction that makes working with asynchronous operations much more pleasant. In the most basic definition, your code will move from continuation-passing style:

getTweetsFor("domenic", function (err, results) {
 // the rest of your code goes here.

The OAuth 2.0 Authorization Framework

This document is intended to be a simplified version of the OAuth 2.0 specification. In particular it has been written with implementors in mind, and as such attempts to trim the spec down to just what you need to implement an OAuth provider or client. It is necessarily not complete, but attempts to introduce spec requirements in the same order in which the protocol proceeds in practise, with everything you need to know about each protocol endpoint brought together in one place rather than scattered across a large document.

Routing in Ember

In Ember, the application's state manager handles routing. Let's take a look at a simple example:

App.stateManager = Ember.StateManager.create({
  start: Ember.State.extend({
    index: Ember.State.extend({
      route: "/",

	require 'bundler/setup'
	Bundler.require

	class Application < Sinatra::Base
	get '/assets/:file' do
	env['PATH_INFO'].gsub!("/assets","")
	asset_handler.call(env)
	end

	get '/' do

	# encoding : utf-8
	require 'openssl'
	require 'digest/sha1'
	require 'base64'

	module Aws
	extend self
	def signed_url(path, expire_date)
	digest = OpenSSL::Digest::Digest.new('sha1')
	can_string = "GET\n\n\n#{expire_date}\n/#{S3_BUCKET}/#{path}"

	=begin

	Every day I use Ruby I see more and more why people become evangelists.

	Take today: I was toying with evaluating different approaches to match two
	data sources (API results and a giant local database), and I realized,
	"wait! this is a job for yield!"

	So I wrote a pleasant little module with a function that:
	- Takes a block which attempts to match an API object to rows in the

	bid() {
	local shortname location

	# combine all args as regex
	# (and remove ".app" from the end if it exists due to autocomplete)
	shortname=$(echo "${@%%.app}"\|sed 's/ /.*/g')
	# if the file is a full match in apps folder, roll with it
	if [ -d "/Applications/$shortname.app" ]; then
	location="/Applications/$shortname.app"
	else # otherwise, start searching

	#!/usr/bin/env bash

	uninstall() {
	list=`gem list --no-versions`
	for gem in $list; do
	gem uninstall $gem -aIx
	done
	gem list
	gem install bundler
	}

	function isRetina(){
	return (('devicePixelRatio' in window && devicePixelRatio > 1) \|\|
	('matchMedia' in window && matchMedia("(min-resolution:144dpi)").matches))
	}

	Latency Comparison Numbers (~2012)
	----------------------------------
	L1 cache reference 0.5 ns
	Branch mispredict 5 ns
	L2 cache reference 7 ns 14x L1 cache
	Mutex lock/unlock 25 ns
	Main memory reference 100 ns 20x L2 cache, 200x L1 cache
	Compress 1K bytes with Zippy 3,000 ns 3 us
	Send 1K bytes over 1 Gbps network 10,000 ns 10 us
	Read 4K randomly from SSD* 150,000 ns 150 us ~1GB/sec SSD