Tai An Su taiansu

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written, the development of the Promises/A+ specification has made the original emphasis on Promises/A seem somewhat outdated.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.

Notes on Paul Irish's "Things I learned from the jQuery source" casts

I watched these videos on 2012/12/14. Today's jQuery version is 1.8.3. So there might be some differences from the original video. I've briefly noted some of the differences between what described in the video and the current stable release. Most code he desribed can be found easily in speed/jquery-basic.js (1.4.2).

Episode 1

2010-06-14 (jQuery 1.4.1)

	{% if site.coderwall_user %}
	<section class="well">
	<ul class="nav">
	<li class="nav-header">Coderwall Badges</li>
	</ul>
	<div id="coderwall_badges"></div>
	<a href="http://coderwall.com/{{site.coderwall_user}}">@{{site.coderwall_user}}</a> on coderwall
	<script type="text/javascript">
	$(document).ready(function(){
	$.getJSON("http://coderwall.com/{{site.coderwall_user}}.json?callback=?", function(data){



	# Install MacTex: http://mirror.ctan.org/systems/mac/mactex/mactex-basic.pkg

	$ sudo chown -R `whoami` /usr/local/texlive
	$ tlmgr update --self
	$ tlmgr install ucs
	$ tlmgr install etoolbox

	# Install pandoc view homebrew

	<% pages = sitemap.resources.find_all{\|p\| p.source_file.match(/\.html/) } %>
	<?xml version="1.0" encoding="UTF-8"?>
	<urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">
	<% pages.each do \|p\| %>
	<url>
	<loc>http://youdomain.com/<%=p.destination_path.gsub('/index.html','')%></loc>
	<priority>0.7</priority>
	</url>
	<% end %>
	</urlset>

	// reference : http://stackoverflow.com/questions/7203304/warning-cant-verify-csrf-token-authenticity-rails
	// : http://stackoverflow.com/questions/8511695/rails-render-json-session-lost

	$.ajax({ url: 'YOUR URL HERE',
	type: 'POST',
	beforeSend: function(xhr) {
	xhr.setRequestHeader('X-CSRF-Token', $('meta[name="csrf-token"]').attr('content'))
	},
	data: 'someData=' + someData,
	success: function(response) {

	################################################################################
	# script: Base.coffee
	# author: Ryan Florence <[email protected]>
	# license: MIT-Style License
	#
	# A surprisingly useful base class for CoffeeScript. Inspired by my old
	# friend, MooTools Class. Provides default options, mixins, and custom events.
	class Base

	defaults: {}

	// will be error.
	$ sudo gem install rmagick -v '2.13.1'

	// If you want to compile or install your own RMagick, you should install the following libraries in your system:
	$ sudo apt-get install libbz2-dev libxt-dev libxext-dev

	// Then remove the following file if exists:
	$ sudo rm /opt/bitnami/common/lib/libbz2.a

	// And finally you can install RMagick

	module ViewHelpers

	def placekitten(size, options={})
	domain = options[:domain] \|\| "http://placekitten.com"
	src = "#{domain}/#{size}?image=#{rand(16)+1}"
	g = options[:g]

	if options[:g]
	src = "#{domain}/g/#{size}?image=#{rand(16)+1}"
	end

	@import compass

	$icons: sprite-map("icons/*.png")
	$icons-hd: sprite-map("icons-hd/*.png")

	i
	background: $icons
	display: inline-block
	@media (-webkit-min-device-pixel-ratio: 1.5), (min-resolution: 144dpi)
	background: $icons-hd