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

gs

Sublime 2 Plugins that I found useful in RoR developement

RubyTest plugin

Sublime Text 2 plugin for running ruby tests! (Unit, RSpec, Cucumber)

https://github.com/maltize/sublime-text-2-ruby-tests

philfreo

{
  "Statement": [
    {
      "Sid": "AllowPublicRead",
      "Effect": "Allow",
      "Principal": {
        "AWS": "*"
      },
      "Action": "s3:GetObject",
      "Resource": "arn:aws:s3:::bucket_name_here/*"

jareware

⇐ back to the gist-blog at jrw.fi

Advanced SCSS

Or, 16 cool things you may not have known your stylesheets could do. I'd rather have kept it to a nice round number like 10, but they just kept coming. Sorry.

I've been using SCSS/SASS for most of my styling work since 2009, and I'm a huge fan of Compass (by the great @chriseppstein). It really helped many of us through the darkest cross-browser crap. Even though browsers are increasingly playing nice with CSS, another problem has become very topical: managing the complexity in stylesheets as our in-browser apps get larger and larger. SCSS is an indispensable tool for dealing with this.

This isn't an introduction to the language by a long shot; many things probably won't make sense unless you have some SCSS under your belt already. That said, if you're not yet comfy with the basics, check out the aweso

tmcw

Extracted from simple-statistics.

nbibler

if [ -f "$rvm_path/scripts/rvm" ]; then
  source "$rvm_path/scripts/rvm"

  if [ -f ".rvmrc" ]; then
    source ".rvmrc"
  fi

  if [ -f ".ruby-version" ]; then
    rvm use `cat .ruby-version`
  fi

mfilej

# http://stackoverflow.com/questions/5108876/kill-a-postgresql-session-connection
namespace :db do 
  desc "Fix 'database is being accessed by other users'"
  task :terminate => :environment do
    ActiveRecord::Base.connection.execute <<-SQL
      SELECT 
        pg_terminate_backend(pid) 
      FROM 
        pg_stat_activity 
      WHERE 

clarkbw

bryan:
  email: clarkbw@example.com
  encrypted_password: <%= User.new.send(:password_digest, '1234567890') %>
  confirmed_at: <%= Time.zone.now - 1.hour %>
  confirmation_sent_at: <%= Time.zone.now - 2.hours %>

pbojinov

Two way iframe communication

The main difference between the two pages is the method of sending messages. Recieving messages is the same in both.

Parent

Send messages to iframe using iframeEl.contentWindow.postMessage Recieve messages using window.addEventListener('message')

iframe

jamesyang124

Ruby Metaprogramming Guide

Note: This guide works with Ruby 2.6+ through Ruby 3.x, with modern Ruby 3.x features highlighted where applicable. Core metaprogramming concepts remain consistent across Ruby versions.

This document has been collaboratively updated and modernized through an interactive process with Claude Code, revised with examples, visual diagrams, and Ruby 3.x compatibility.

Table of Contents

1. Key Concepts
2. Self