I really enjoyed the narrative comments you put in the first exercises, it made them engaging to read, even next to relatively simple code which the exercises called for. I also liked your solution to exercise 5. Your multiply-alien-parts-by-5 is on point!

Looking forward to seeing your code in the following chapters!

General Comments

I appreciate how thoroughly you test your solutions, I should follow suit.

Exercise 2

I like that you practiced using multi-arity here, I'm still not used to thinking in those terms. Should I think of it as a useful tool to reach for when recursing?

I took two different approaches to solving this one, both strike me as pretty different from your take, and I realize now that neither quite behaves the same way as comp in the case of receiving a scalar value instead of a fn, good catch.

Exercise 3

Well done, I inverted the if/else branches but other than that reached the same solution.

Exercise 5

Ahhh, I didn't account for the arguments to the function in my solution, I assumed either a single function or a fully contained anonymous function, an unfair assumption given how the docs say update-in should work.