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

staltz

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.

---

paulirish

What forces layout / reflow

All of the below properties or methods, when requested/called in JavaScript, will trigger the browser to synchronously calculate the style and layout*. This is also called reflow or layout thrashing, and is common performance bottleneck.

Generally, all APIs that synchronously provide layout metrics will trigger forced reflow / layout. Read on for additional cases and details.

Element APIs

Getting box metrics

• elem.offsetLeft, elem.offsetTop, elem.offsetWidth, elem.offsetHeight, elem.offsetParent

MoOx

%reset-Button {
    border: none;
    margin: 0;
    padding: 0;
    width: auto;
    overflow: visible;

    background: transparent;

    /* inherit font & color from ancestor */

andyferra

body {
  font-family: Helvetica, arial, sans-serif;
  font-size: 14px;
  line-height: 1.6;
  padding-top: 10px;
  padding-bottom: 10px;
  background-color: white;
  padding: 30px; }

body > *:first-child {

jwo

# 
# Install the MYSQL driver
#   gem install mysql2
#
# Ensure the MySQL gem is defined in your Gemfile
#   gem 'mysql2'
#
# And be sure to use new-style password hashing:
#   http://dev.mysql.com/doc/refman/5.0/en/old-client.html
development:

elcamino

#!/usr/bin/env ruby

require 'selenium-webdriver'

wd = Selenium::WebDriver.for :remote, url: 'http://10.3.1.7:4444/wd/hub', desired_capabilities: :chrome
wd.navigate.to 'https://snipt.net/restrada/python-selenium-workaround-for-full-page-screenshot-using-chromedriver-2x/'

# Get the actual page dimensions using javascript
#
width  = wd.execute_script("return Math.max(document.body.scrollWidth, document.body.offsetWidth, document.documentElement.clientWidth, document.documentElement.scrollWidth, document.documentElement.offsetWidth);")

liangzan

var fs = require('fs')
  , path = require('path')
  , _ = require('underscore');

var rootPath = "/path/to/remove";
removeDirForce(rootPath);

// path should have trailing slash
function removeDirForce(dirPath) {
  fs.readdir(dirPath, function(err, files) {

MichalZalecki

// Import all

import Rx from "rxjs/Rx";

Rx.Observable
  .interval(200)
  .take(9)
  .map(x => x + "!!!")
  .bufferCount(2)
  .subscribe(::console.log);

kocsenc

jSpin for Mac and Linux

This is a quick simple guide to getting jSpin setup for Mac and Linux.

Prereq's

You will need:

• Java (1.5 +)