mattetti

# Change the path to match the path to your machine.
$mrb_path = File.expand_path("~/src/mruby")
$mrbc = File.join($mrb_path,"/bin/mrbc")

task :default do
  # dumps the Ruby file to disk
  File.open("mandelbrot.rb", "w"){|f| f << mandelbrot_ruby_code }
  # creates the .c file containing mandelbrot char array for the bytecode
  `#{$mrbc} -Bmandelbrot_bytecode ./mandelbrot.rb`
  example_file = wrapper_code(File.read("./mandelbrot.c"))

jcoglan

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.

garybernhardt

# A queue that you can pass to IO.select.
#
# NOT THREAD SAFE: Only one thread should write; only one thread should read.
#
# Purpose:
#   Allow easy integration of data-producing threads into event loops.  The
#   queue will be readable from select's perspective as long as there are
#   objects in the queue.
#
# Implementation:

hellerbarde

Latency numbers every programmer should know

L1 cache reference ......................... 0.5 ns
Branch mispredict ............................ 5 ns
L2 cache reference ........................... 7 ns
Mutex lock/unlock ........................... 25 ns
Main memory reference ...................... 100 ns             
Compress 1K bytes with Zippy ............. 3,000 ns  =   3 µs
Send 2K bytes over 1 Gbps network ....... 20,000 ns  =  20 µs
SSD random read ........................ 150,000 ns  = 150 µs

Read 1 MB sequentially from memory ..... 250,000 ns = 250 µs

jboner

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

justinko

Dear Rubyists,

I just lost a contract because of my code in a Rails project.

The specific code in question is related to a "posting a comment" feature. Here are the details:

In this project, "posting a comment" does not simply entail inserting a row into the database. It involves a procedure to yes, insert a row, but also detect its language, check for spam, send emails, and "share" it to Twitter and Facebook. I believe this algorithm should be encapsulated. I do not believe it belongs in a controller or a model. I do not believe Active Record callbacks should be used.

The "senior developer", whom is the stake holder's right hand man, said this:

ivanacostarubio

"Pick the right ones, and programming will flow naturally from design; 
modules will have small and simple interfaces; and new functionality will
more likely fit in without extensive reorganization. 

Pick the wrong ones, and programming will be a series of nasty surprises: 
interfaces will become baroque and clumsy as they are forced to accommodate 
unanticipated interactions, and even the simplest of changes will be hard to make."


MIT Professor Daniel Jackson

bravoecho

class MyEvilDependency
  def self.do_good
    "ok"
  end

  def self.save_the_world
    puts "I could destroy the world if I wanted"
  end
end

tobyhede

 -- PostgreSQL 9.2 beta (for the new JSON datatype)
 --   You can actually use an earlier version and a TEXT type too
 -- PL/V8 http://code.google.com/p/plv8js/wiki/PLV8

 -- Inspired by 
 -- http://people.planetpostgresql.org/andrew/index.php?/archives/249-Using-PLV8-to-index-JSON.html
 -- http://ssql-pgaustin.herokuapp.com/#1

  -- JSON Types need to be mapped into corresponding PG types 
  -- 

bravoecho

#!/usr/bin/env bash
apt-get -y update
apt-get -y install build-essential zlib1g-dev libssl-dev libreadline-dev libyaml-dev
cd /tmp
wget http://ftp.ruby-lang.org/pub/ruby/1.9/ruby-1.9.2-p320.tar.gz
tar -xvzf ruby-1.9.2-p320.tar.gz
cd ruby-1.9.2-p320/
./configure --prefix=/usr/local
make
make install