Gimi Liang zliang-min

ruby-1.9.3-p327 cumulative performance patch for rbenv

This installs a patched ruby 1.9.3-p327 with various performance improvements and a backported COW-friendly GC, all courtesy of funny-falcon.

Requirements

You will also need a C Compiler. If you're on Linux, you probably already have one or know how to install one. On OS X, you should install XCode, and brew install autoconf using homebrew.

Learn JavaScript concepts with the Chrome DevTools

Authored by Peter Rybin , Chrome DevTools team

In this short guide we'll review some new Chrome DevTools features for "function scope" and "internal properties" by exploring some base JavaScript language concepts.

Closures

Let's start with closures – one of the most famous things in JS. A closure is a function, that uses variables from outside. See an example:

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.

	// Here is a proposal for minimalist JavaScript classes, humbly offered.

	// There are (at least) two different directions in which classes can be steered.
	// If we go for a wholly new semantics and implementation, then fancier classical
	// inheritance can be supported with parallel prototype chains for true inheritance
	// of properties at both the class and instance level.

	// If however, we keep current JavaScript prototype semantics, and add a form that
	// can desugar to ES3, things must necessarily stay simpler. This is the direction
	// I'm assuming here.

	def output name=((default=true); "caius")
	puts "name: #{name.inspect}"
	puts "default: #{default.inspect}"
	end

	output
	# >> name: "caius"
	# >> default: true

	output "avdi"

	# Problem: I need to add some model's default scope to an ARel query

	# I don't know if everyone else already knew this, or if there's a
	# a cleaner way; but this has been working well for me:
	class OtherModel < ActiveRecord::Base
	# ...
	default_scope where(:deleted_at => nil)
	# ...
	end

	require 'minitest/autorun'

	###
	# Test to demonstrate TCO in Ruby. Tested in 1.9.2+
	class TestTCO < MiniTest::Unit::TestCase
	code = <<-eocode
	class Facts
	def fact_helper(n, res)
	if n == 1
	res

	$VERBOSE = nil
	require File.expand_path('../rooby', __FILE__)


	Person = Rooby::Class.new 'Person' do
	define :initialize do \|name\|
	@name = name
	end

	define :name do

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

	(function() {
	var CSSCriticalPath = function(w, d, opts) {
	var opt = opts \|\| {};
	var css = {};
	var pushCSS = function(r) {
	if(!!css[r.selectorText] === false) css[r.selectorText] = {};
	var styles = r.style.cssText.split(/;(?![A-Za-z0-9])/);
	for(var i = 0; i < styles.length; i++) {
	if(!!styles[i] === false) continue;
	var pair = styles[i].split(": ");