Validating date in Java Script
There are lots of method available which uses REG EXP to validate date and are bit complicated to understand. Here is simple and small date validator.
function isValidDate(day, month, year){
var date;
//Get a Date object based on the given day, month and year
//months start at 0 (0-11 instead of 1-12)
date = new Date(year,month-1,day);
return ((day == date.getDate()) && (month == (date.getMonth()+1))
&& (year == date.getFullYear()));
}
Sun turns JavaScript into Java. Google turns Java into JavaScript
JavaScript is said to be World’s Most Misunderstood Programming Language. Why is the language so misunderstood? It may be the name JavaScript 
. It doesn’t have any relation with Java.
No programming language is perfect. JavaScript has many errors like overloading of +, reserved word policies are too rigid, Semicolon insertion and some more.
When I started working on JavaScript, I felt it an easy language but sooner I was facing many issues like browser compatibility, memory leaks and many other common problems.
There are many sites discussing about all these. I would refer few of them in this post.
Being a scripting language, support of object-oriented programming is quite impressive. Even though there are no classes and instances, there are objects, prototypes, and implicit inheritance.
Browser compatibility issue can be handled using object level detection (Don’t check browsers rather check objects).
Memory leak is a challenging problem. The browsers try to work well with broken web, making it look fine and behave well. This is a very difficult task. If browser fails to collect the garbage that we left, is a buggy browser (memory leak). Most browsers don’t do a very good job about memory leak.
I would like to say thanks to Google and many other companies which are writing JavaScript libraries and making JavaScript hot. A good JavaScript Compiler would definitely make JavaScript library implementation easier. Check Google’s web development toolkit.
Mozilla’s (Venkman) JavaScript engine has built-in support for debugging, and thus can provide powerful tools for JavaScript developers.
Check following links
if one closure is buggy, then use more closures
http://www.bazon.net/mishoo/articles.epl?art_id=824
http://talideon.com/weblog/2005/03/js-memory-leaks.cfm
Javascript library
http://www.thingsthemselves.com/~jeff/computing/jslib/
http://www.howtocreate.co.uk/jslibs/
The Event Object
http://www.webdevelopersjournal.com/articles/jsevents3/jsevents3.html
Obejcts
http://developer.mozilla.org/
Google JavaScript APIs
http://code.google.com/apis.html
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What do you understand from “Quality of Software”?
Quality is a subjective term, whose meaning may vary from person to person. Profitability, User-friendliness or Bug-freeness are some important factors while deciding the quality of software. Although there may be a number of criteria to define the quality the following points are important that quality software should possess:
1. Reasonably defect-free
2. Delivered on time
3. Meets requirements
4. Maintainable