Couto

    /**
     * __series
     * Given an array of functions, it will call every function,
     * once at a time, sequentially.
     * Every function will have a trigger function as its last argument,
     * that should be called when the function is done.
     * If arguments are given to this trigger function, those will be passed
     * to the next function.
     *
     * @example

tomschlick

[
	{
		"keys": ["super+alt+left"],
		"command": "set_layout",
		"args":
		{
			"cols": [0.0, 0.33, 1.0],
			"rows": [0.0, 1.0],
			"cells": [[0, 0, 1, 1], [1, 0, 2, 1]]
		}

jed

(tl;dr DOM builders like [domo][domo] trump HTML templates on the client.)

Like all web developers, I've used a lot of template engines. Like most, I've also written a few of them, some of which even [fit in a tweet][140].

The first open-source code I ever wrote was also one of the the first template engines for node.js, [a port][node-tmpl] of the mother of all JavaScript template engines, [John Resig][jresig]'s [micro-templates][tmpl]. Of course, these days you can't swing a dead cat without hitting a template engine; one in eight packages on npm ([2,220][npm templates] of 16,226 as of 10/19) involve templates.

John's implementation has since evolved and [lives on in Underscore.js][underscore], which means it's the default choice for templating in Backbone.js. And for a while, it's all I would ever use when building a client-side app.

But I can't really see the value in client-side HTML templates anymore.

chriscoyier

@media only screen and (min-width: 320px) {

  /* Small screen, non-retina */

}

@media
only screen and (-webkit-min-device-pixel-ratio: 2)      and (min-width: 320px),
only screen and (   min--moz-device-pixel-ratio: 2)      and (min-width: 320px),
only screen and (     -o-min-device-pixel-ratio: 2/1)    and (min-width: 320px),

Couto

ArchLinux on a Raspberry Pi

Install the system to the SD card

Connect the SD card to your computer and open the terminal.

• Find the disk id

df -h

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

Couto

function namespace (ns) {
  var parts = ns.split('.'),
      root = window || this;
  
  return (function walk (obj) {
    if (!root[obj]) { root[obj] = {}; }
    root = root[obj];
    if (parts.length) { walk(parts.shift()); } 
    return root;
  }(parts.shift()));

nijikokun

  var user = {
    validateCredentials: function (username, password) {
      return (
          (!(username += '') || username === '') ? { error: "No Username Given.", field: 'name' }
        : (!(username += '') || password === '') ? { error: "No Password Given.", field: 'pass' }
        : (username.length < 3)                  ? { error: "Username is less than 3 Characters.", field: 'name' }
        : (password.length < 4)                  ? { error: "Password is less than 4 Characters.", field: 'pass' }
        : (!/^([a-z0-9_-]+)$/i.test(username))   ? { error: "Username contains invalid characters.", field: 'name' }
        : false
      );

Couto

/**
 * walk
 * small function to walk along an array of functions
 * each function walked gets an extra argument
 * that argument is a function that should be called
 * to notify the walk function to step to the next function
 * the arguments given at call time are passed to the next function
 *
 * @function
 * @param {Array} fns Array of functions