(Edit: The citation got messed up, it should be: >The only thing you can do with a function is call it. You can also abstract over it, and pass it around. Whi

(Edit: The citation got messed up, it should be: >The only thing you can do with a function is call it. You can also abstract over it, and pass it around. Which allows you to build whatever you want, numbers, booleans, if-then-else, etc.)