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(Shameless self-promotion:)

Though it's currently hard to do 3D, we have similar features in the Khan Academy CS section:

http://www.khanacademy.org/cs

However, we don't restart the code from the beginning when you change something -- you'll notice that if you change the code in the linked page, the icosahedron jumps to a new angle, whereas with the KA environment, execution continues from the current state.

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Maybe I should change the default code to use Date.now()? ;)

That would certainly give the proper illusion. :)

With our environment, you can interact with it and it'll maintain that state as well.

In John's post he mentions that doing hotswapping is very hard, but that hasn't been my experience so far. Can you by chance expound a bit on what makes/made it so difficult?

I'm curious to see what you've done -- anything you can share?.

I'll let John write up the details in a future blog post, but mostly there are a lot of strange edge cases and problems that have to deal with maintaining closures, etc.

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