psiborg

DEFAULTS = {
    color: "blue",
    border: 0,
    width: '128px',
    height: '128px'
};

function mergeOptions (defaults, options) {
    for (var name in defaults) {
        if (defaults.hasOwnProperty(name)) {

psiborg

function setBG (options) {
    var args = {
        red: 255,
        green: 255,
        blue: 255
    }

    // overwrite defaults
    for (var i in options) {
        args[i] = options[i];

psiborg

function say (name, agree) {
    // provide default values
    var name = name || "Fred";
    var agree = (agree !== undefined) ? true : false;
}

say(); // Fred, false
say("Barney"); // Barney, false
say("Barney", "anything"); // Barney, true

psiborg

(function () {
    // self-invoking function
})();

psiborg

function outerFunction () {
    return function () {
        // anonymous inner function
    }
}

psiborg

function getStockQuote() {
    var xhr;
    if (window.XMLHttpRequest) {
        xhr = new XMLHttpRequest();
    }
    else {
        xhr = new ActiveXObject("Microsoft.XMLHTTP");
    }

    xhr.onreadystatechange = function () {

psiborg

// object literal
var myObj = {
    property1: 42,
    property2: "Hello",
    property3: true
};

// loop over properties
for (var i in myObj) {
    console.log(i + ': ' + myObj[i]);

psiborg

// add items
[1, 2, 3].concat([4, [5, 6]]); // [1, 2, 3, 4, 5, 6]

[1, 2, 3].push([4, [5, 6]]); // [1, 2, 3, 4, [5, 6]]
[1, 2, 3].unshift([4, [5, 6]]); // [4, [5, 6], 1, 2, 3]

// remove items
[1, 2, 3].pop(); // [1, 2]
[1, 2, 3].shift(); // [2, 3]

psiborg

escape(str)
unescape(str)

encodeURI(str)
decodeURI(str)

encodeURIComponent(str)
decodeURIComponent(str)

var url = "http://finance.yahoo.com/q?s=RIM.TO&ql=0";

psiborg

"abcde".charAt(3); // d
"abcde".charCodeAt(0); // 100 = d
String.fromCharCode(100); // d

"abcde".slice(0, 2); // ab
"abcde".slice(1, -1); // bcd
"abcde".slice(-2); // de

"abcde".substr(0, 2); // ab
"abcde".substr(1, 3); // bcd