Javascript

1. typeof

'typeof' can be used to find the datatype of a particular variable. e.g. if you run:

var i = "12";
var iType = typeof i;
var j = 12;
var jType = typeof j;
alert("iType: " + iType);
alert("jType: " + jType);

You will get the following 2 alerts:

iType: string
jType: number

2. Yahoo UI (yui)

We've recently begun using the yui toolkit to help with some design and coding of front end user interfaces. Its very neat and relatively easy to setup. The official site is at http://developer.yahoo.com/yui/

3. Links

DevGuru's javascript index

javascript best practices contains some good tips.