Why would it be beneficial to use an array in Prototype?

How would you create a new div element and insert it as the last child of the body?

Utilities $A and $R create an array and ObjectRange object. What will be their results given the following string; $A($R('a', 'e')) ?

Prototype JS framework with version 1.6.0 defines two additional class properties:

Why is event delegation important in Prototype?

When writing custom DOM methods, what must be placed as the first argument?

When using data from an untrusted source, it should be sanitized. What does this entail?

By using the Element#on object in Prototype event API, what benefit is being gained?

Element#measure(property) gives:

Lets say you have an array with name myArray. How would you organize a loop?

In the context of Prototype, “safe” means that AJAX will function how?