The keywords are there on every line to make them easy to verbally read. This is most important in the case of set x = 7, the keyword makes it clear that we're trying to mutate a variable, not assert equality.

Even though technically we could make forward() a method at the top level in the context of a paint program, we chose to make things more OOPy to prepare them for later when students get to the 2D game engine and there can be multiple sprites to control.