Yichuan Shen yishn

🏳️‍🌈

˚✧₊⁎( ˘ω˘ )⁎⁺✧༚

Software developer, mathematician at heart, wannabe artist, and gaymer.

yishn / takeScreenShot.js

Created November 21, 2019 12:27

Take screenshot in the browser

	const canIRun = navigator.mediaDevices.getDisplayMedia

	const takeScreenShot = async () => {
	const stream = await navigator.mediaDevices.getDisplayMedia({
	video: { mediaSource: 'screen' },
	})
	// get correct video track
	const track = stream.getVideoTracks()[0]
	// init Image Capture and not Video stream
	const imageCapture = new ImageCapture(track)

yishn / uuid.js

Last active April 9, 2024 18:22

Get shorter UUID

	function id() {
	return crypto.randomUUID().split('-').map(x => parseInt(x, 16).toString(36)).join('')
	}

yishn / normalrand.js

Last active June 20, 2018 08:16

Box-Muller transform

	// Standard normal variate using Box-Muller transform
	// https://en.wikipedia.org/wiki/Box-Muller_transform

	function normalrand() {
	let u = 0, v = 0;
	while (u === 0) u = Math.random();
	while (v === 0) v = Math.random();

	return Math.sqrt(-2.0 * Math.log(u)) * Math.cos(2.0 * Math.PI * v);
	}

yishn / amount.js

Created March 12, 2018 23:00

Pretty print money amounts

	exports.amount = function(amount) {
	if (isNaN(amount)) return exports.amount(0)
	if (amount < 0) return `-${exports.amount(-amount)}`

	let result = (Math.round(amount * 100) + '').padStart(3, '0')
	let [number, float] = [result.slice(0, -2), result.slice(-2)]
	let thousands = []

	for (let i = 1; -3 * i >= -number.length; i++) {
	thousands.unshift(number.slice(-3 * i, (-3 * i + 3) \|\| undefined))

yishn / lines_of_code

Last active August 20, 2017 23:10

Count number of lines of code

	git diff --stat 4b825dc642cb6eb9a060e54bf8d69288fbee4904

	% This shows the differences from the empty tree to your current working tree.
	% Which happens to count all lines in your current working tree.

yishn / face.tex

Created February 21, 2017 19:56

LaTeX face

\overbrace{\left(\ddot{\stackrel{\quad>}{\smile}}\right)}_{\begin{align}\hline\qquad\end{align}}

yishn / playing-go.txt

Last active July 9, 2017 14:24

Playing Go