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

robmiller

#!/bin/bash
# git-cleanup-repo
#
# Author: Rob Miller <[email protected]>
# Adapted from the original by Yorick Sijsling

git checkout master &> /dev/null

# Make sure we're working with the most up-to-date version of master.
git fetch

macbleser

#!/bin/bash
#
# This script configures WordPress file permissions based on recommendations
# from http://codex.wordpress.org/Hardening_WordPress#File_permissions
#
# Author: Michael Conigliaro
#
WP_OWNER=changeme # <-- wordpress owner
WP_GROUP=changeme # <-- wordpress group
WP_ROOT=/home/changeme # <-- wordpress root directory

paulirish

/* bling.js */

window.$ = document.querySelectorAll.bind(document);

Node.prototype.on = window.on = function (name, fn) {
  this.addEventListener(name, fn);
};

NodeList.prototype.__proto__ = Array.prototype;

w3core

/**
 * Calculate brightness value by RGB or HEX color.
 * @param color (String) The color value in RGB or HEX (for example: #000000 || #000 || rgb(0,0,0) || rgba(0,0,0,0))
 * @returns (Number) The brightness value (dark) 0 ... 255 (light)
 */
function brightnessByColor (color) {
  var color = "" + color, isHEX = color.indexOf("#") == 0, isRGB = color.indexOf("rgb") == 0;
  if (isHEX) {
    var m = color.substr(1).match(color.length == 7 ? /(\S{2})/g : /(\S{1})/g);
    if (m) var r = parseInt(m[0], 16), g = parseInt(m[1], 16), b = parseInt(m[2], 16);

samthor

// UPDATE: In 2023, you should probably stop using this! The narrow version of Safari that
// does not support `nomodule` is probably not being used anywhere. The code below is left
// for posterity.

/**
 * Safari 10.1 supports modules, but does not support the `nomodule` attribute - it will
 * load <script nomodule> anyway. This snippet solve this problem, but only for script
 * tags that load external code, e.g.: <script nomodule src="nomodule.js"></script>
 *
 * Again: this will **not** prevent inline script, e.g.:

samthor

/**
 * Updates the passed dialog to retain focus and restore it when the dialog is closed. Won't
 * upgrade a dialog more than once. Supports IE11+ and is a no-op otherwise.
 * @param {!HTMLDialogElement} dialog to upgrade
 */
var registerFocusRestoreDialog = (function() {
  if (!window.WeakMap || !window.MutationObserver) {
    return function() {};
  }
  var registered = new WeakMap();

slightlyoff

Background

One of the biggest missed opportunities thus far with HTTP/2 ("H/2") is that we are not yet able to sunset WebSockets in favor of H/2. Web Sockets and H/2 both support multiplexing messages bi-directionally and can send both textual and binary data.

Server Sent Events ("SSE"), by contrast, are not bi-directional (they're a "server-push-only" channel) and binary data cannot be sent easily. They are, however, very simple to implement. Adding to the menagerie of options, RTCPeerConnection can also be used to signal data to applications in a low-latency (but potentially lossy) way.

Because H/2 [does not support the handshake (upgrade) that WebSockets use to negotiate a connection](https://daniel.haxx.se/blog/2016/06/15/no-websockets-

developit

🐻 valoo

just the bare necessities of state management.

Usage

Hotlink it from https://unpkg.com/valoo.

See Interactive Codepen Demo.

rauschma

async function listenRepeatedly(entity: string, server: Server, port: number) {
  for (let i=0; i<10; i++) {
    const currentPort = port + i;
    try {
      await listenOnce(server, currentPort);
      console.log(`${entity}: listening at port ${currentPort}.`);
      return;
    } catch (err) {
      if (err.code === 'EADDRINUSE') {
        console.log(`${entity}: port ${currentPort} in use, trying next port...`);