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?

Using Element.Layout you can measure elements that are hidden:

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?

What solution has Prototype 1.7 introduced to provide a more concise API?