sine.js

//#!node

const sleep = (n) => new Promise( (resolve) => setTimeout(resolve, n) );
const asciichart = require('asciichart')


const screen = {
	clear: function () {
		console.log('\x1b[2J');
	},
	move: function (x, y) {
		console.log(`\x1b[${y};${x};H`);
	}
};

async function main () {
	const data = [];
	for (;;) {
		screen.clear();
		screen.move(1, 1);

		data.push(Math.sin((Date.now() / 1000) * ((Math.PI * 4) / 10)));
		while (data.length > 120) data.shift();

		console.log(asciichart.plot(data, {
			height: 40,
		}))

		await sleep(100);
	}
};

main();