Today I started using a lovely Clojure library called Overtone, for generating music. It is pretty easy to use and a fun time. On the box it says that you need to be “comfortable with” Clojure, the basics of music theory, and the Supercollider audio synthesis environment. I do not know any of these things and I successfully made sounds by copying and changing examples.
I wrote a tiny bit of code to play rhythms. And I ran into my first
clojure bug! I defined a function
side-effecty-thing, and ran
(map side-effecty thing sequence)
And that ran fine. It made sounds!
But then I tried something like
(def new-function [time] (map side-effecty thing sequence) (apply-at (+ time 4) '#new-function (+ time 4)))
which basically does the
(map side-effecty-thing) and then calls
itself recursively, later. And this did not make sounds. And I was
TOTALLY CONFUSED, because, it says
(map side-effecty-thing) in it!
It should make sounds!
But then Travis explained that
map is lazy and not actually
appropriate if you want the function you are running to happen right
So what I actually wanted to use was
doseq, which will let you
actually make the side-effecty things happen when you ask for them.
And it throws away the result, which is good because I didn’t actually
want the result. Yay!
ALSO EMACS IS ENJOYABLE. Paredit is nice. I am in fact not using Evil mode. I am using Normal Emacs, with a few packages:
- Graphene, to make everything a bit prettier
- clojure mode, clojure test mode, and cider, for Clojure fun. Apparently cider is the thing that people use now and it is the same as nRepl.
This is a strange and confusing world, humans! I no longer know how to write if statements without looking it up! Very Exciting Times!