Get Start with CoffeeScript

What is CoffeeScript?
For starter, it is a language that compiles to JavaScript prior to execution, so there’s no compilation at runtime. And let's quote from their website:-

The golden rule of CoffeeScript is: "It's just JavaScript". The code compiles one-to-one into the equivalent JS, and there is no interpretation at runtime. You can use any existing JavaScript library seamlessly (and vice-versa). The compiled output is readable and pretty-printed, passes through JavaScript Lint without warnings, will work in every JavaScript implementation, and tends to run as fast or faster than the equivalent handwritten JavaScript.

For example

square = (x) -> x * x
cube   = (x) -> square(x) * x

will translate to

var cube, square;
square = function(x) {
  return x * x;
};
cube = function(x) {
  return square(x) * x;
};

There are some useful links you can take a look in order to understand or get familiar with it, if you will.

http://net.tutsplus.com/tutorials/javascript-ajax/rocking-out-with-coffeescript/

http://dailyjs.com/2011/05/30/code-review-coffeescript/

http://jashkenas.github.com/coffee-script/