If lemmygrad is what op is commenting on, they left it out of the image and caption.

I think it would be much better to write it in another language, but here’s another way to do the second one (this is on Visual Basic):

Dim n as long
Dim product as long
Product = 1

For n = 1 to 4
Product = product * 2 * n
Next n

It bothers me that he called it a gearless bike. It’s clutched, but also still geared.