geastwood

• this will not refer to window object
• callee, caller of arguments object are not allowed under strict mode
• under strict mode parameter is not refereced linked to arguments object, no strict mode, parameter is a reference of the arguments object.

(function() {
    var nostrict = function(x) {
        arguments[0] = 'modified';
        console.log('arguments[0] =', arguments[0]);
        console.log('x=', arguments[0]);
 console.log('under non-strict mode,', x === arguments[0]); // log true

geastwood

var constructor = function() {return null;};
var f = function f() {
    return constructor();
};

f();
// Under ES3
// logs {}, object literal

// Under ES5

geastwood

Generate take-away

Concept 1: Iterators

In computer programming, an iterator is an object that enables a programmer to traverse a container.

When invoked, generator functions return iterators

Concept 2: Run-to-completion

Run-to-completion scheduling is a scheduling model in which each task runs until it either finishes, or explicitly yields control back to the scheduler.

geastwood

/*
 * Mongoose magic
 */
var mongoose = require('mongoose');
mongoose.connect('mongodb://localhost:27017/fei');
var db = mongoose.connection;
db.on('error', console.error.bind(console, 'connection error'));
db.once('open', function() {
    var kittySchema = mongoose.Schema({
        name: String

geastwood

define(function() {

    var ScriptLoader = function(url, ns, onLoadCallback, name) {
        this.url = url; // url of the module
        this.ns = ns; // source obj/ns obj to bind 'define' method
        this.onLoadCallback = onLoadCallback;
        this.name = name; // dependency name
        this.load();
    };

geastwood

Apache

server

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

folder structure

/etc/apache2/ // main folder

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# Apache 

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

geastwood

Vim CHEAT SHEET

Folding

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

geastwood

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() {

geastwood

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.