geastwood

// use Object toString method to determine Array
var isArray = function(obj){
    return Object.prototype.toString.call(obj) === '[object Array]';
}

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window.singleton = (function(){
    
    var instance;
    
    var init = function() {
        return Math.random();
    };
    
    return {
        

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// simple namespace function
// use: var newNs = namespace('this.is.a.new.namespace');

var namespace = function(namespace, context) {
  
  if (!namespace) { throw 'namespace string is required' };
  
  var ns = namespace.split('.');
  var current = context || this;
  

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"hello".missing;    // log undefined
[][99];             // log undefined
{} + {};            // log NaN
[] + [];            // log "" (empty string)
[] + {};            // log "[object Object]"
{} + [];            // log 0

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Object Descriptor takeaways

A descriptor is an object which describe how the property behaves.

use object literal

Simplest way to define an object is by using object literal, by doing so, the created object are set with implicit descriptors to all "true". As illustrated below:

var objectLiteral = {
    name: 'foo'
};

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set nocompatible

filetype on
filetype indent on
filetype plugin on

syntax enable

set ignorecase
set hlsearch

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Why passing undefined to Immediately invoking function

(function(window, document, undefined) {...})(window, document);

• save undefined variable from redeclearation
• save bit from minification, since the variables will be replaced with shorter alias.

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pattern to replace setInterval with setTimeout

Register a task with setInterval and a interval is not desirable, since the task can take more time than the interval, so the compiler will skip through the current cycle. Replace setInterval with setTimeout with following pattern:

setInterval(function() {
    runSomething();
}, interval);

with

(function loop() {

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Vim CHEAT SHEET

Folding

Keystrokes	Description
zc	Close a fold
zo	Open a fold
za	Toggle a fold
zR	Open all folds

geastwood

# Apache 

```
/etc/init.d/apache2 start/stop/restart
```