From d80a2aac1aa7be216dc01437f85b281a64e09687 Mon Sep 17 00:00:00 2001
From: Skladnayazebra <skladnayazebra@gmail.com>
Date: Thu, 9 Jul 2026 16:51:10 +0200
Subject: add notes.js

---
 notes.js | 57 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 57 insertions(+)
 create mode 100644 notes.js

(limited to 'notes.js')

diff --git a/notes.js b/notes.js
new file mode 100644
index 0000000..b80188c
--- /dev/null
+++ b/notes.js
@@ -0,0 +1,57 @@
+import { createInterface } from 'node:readline/promises';
+
+const noteList = [
+  ["do", "tidi"],
+  ["dodi", "rebe"],
+  ["re"],
+  ["redi", "mibe"],
+  ["mi", "fabe"],
+  ["fa", "midi"],
+  ["fadi", "sobe"],
+  ["so"],
+  ["sodi", "labe"],
+  ["la"],
+  ["ladi", "tibe"],
+  ["ti", "dobe"],
+];
+
+const MAX_INTERVAL = 4;
+
+const randomIndex = (array) => Math.floor(Math.random() * array.length);
+const randomElement = (array) => array[randomIndex(array)];
+
+const readline = createInterface({
+	input: process.stdin,
+	output: process.stdout,
+});
+
+const makeTest = async () => {
+	const startingNoteIndex = randomIndex(noteList);
+	// random number between -$MAX_INTERVAL --- +$MAX_INTERVAL
+	const getInterval = () => Math.round((Math.random() * MAX_INTERVAL * 2) - MAX_INTERVAL);
+	const interval = getInterval()
+	const displayInterval = interval > 0 ? `+${interval}`: interval;
+	const displayStartingNote = randomElement(noteList[startingNoteIndex])
+	// 11 + 4 should yield 3
+	const targetIndex = (startingNoteIndex + interval) % noteList.length
+	const acceptedAnswers = noteList.at(targetIndex);
+
+	performance.mark('start')
+	const response = await readline.question(`${displayStartingNote} ${displayInterval} `)
+	try {
+		if (acceptedAnswers.includes(response)) {
+			performance.mark('end')
+			const { duration } = performance.measure('time', 'start', 'end')
+			console.log('correct!', `Took ${Math.round(duration)/1000}s`);
+		} else {
+			console.log('wrong! should be:', acceptedAnswers.join(', or '))
+		}
+	} catch (e) {
+		console.log('error!');
+		console.log({ startingNoteIndex, interval, targetIndex })
+	}
+}
+
+while (true) {
+	await makeTest()
+}
-- 
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