init simple practice toyHEADtrunk

1 files changed, 20 insertions, 0 deletions

diff --git a/exp/practool.js b/exp/practool.js
new file mode 100644
index 0000000..782b992
--- /dev/null
+++ b/exp/practool.js
@@ -0,0 +1,20 @@
+let body = document.body;
+let doc = {};
+body.querySelectorAll('[id]').forEach(e => doc[e.id] = e);
+
+let rand = x => Math.floor(Math.random() * x);
+let arand = a => a[rand(a.length)]
+
+let roots = [
+  "A", "B", "C", "D", "E", "F", "G",
+  "A#", "C#", "D#", "F#", "G#",
+  "Ab", "Bb", "Db", "Eb", "Gb",
+];
+let modes = [
+  "major",
+  "natural minor", "harmonic minor", "melodic minor",
+];
+let random_scale = () => `${arand(roots)} ${arand(modes)}`;
+
+doc.scale_btn.onclick = () => doc.scale.innerHTML = random_scale();
+doc.scale_btn.onclick();