[plt-scheme] HTDP: So you thought us empty? and empty

..... in HTDP.

But as soon as one switches to MrED it turns out that's not even part of the standard.

What exactly was the point of teaching us empty? and empty ?

I mean I'm sure that I will find a function that is the equivalent of the above because there just has to be, but what was the point?

Best regards

Guenther

BTW I figure it is "null"