It's definitely better. You might want something longer to type than 4 in the example, though. Explaining the let syntax only after the user has had to use it

It's definitely better. You might want something longer to type than 4 in the example, though. Explaining the let syntax only after the user has had to use it once felt a bit funny to me, though I guess that's the pattern of the rest of the tutorial. I'm one of those people who tends to learn more from references than tutorials, so that might be saying more about my learning style than your tutorial.