Sheraff’s gists

Sheraff / careful_attack.js

Last active January 6, 2020 19:25

	const privateKey = Symbol('secret')

	class SymbolPrivate {
	constructor() {
	this[privateKey] = 'SECRET'
	this.publicKey = 42
	}
	get privateKey() {
	return this[privateKey]
	}

Sheraff / IdlePromise.js

Last active May 27, 2021 03:51

Idle-until-urgent with generators and promises

	export default class IdlePromise {
	static duration = Symbol('Next yield duration')
	static onUrgent = Symbol('Callbacks when finish()')
	static padding = 1

	promise = new Promise((resolve, reject) => {
	this.resolve = resolve
	this.reject = reject
	})
	then = this.promise.then.bind(this.promise)

Sheraff / circular-data-median.js

Created August 9, 2020 15:19

Implementation of median angle function — A More Efficient Way Of Obtaining A Unique Median Estimate For Circular Data — 2003 / B. Sango Otieno & Christine M. Anderson-Cook

	/**
	*
	* Implementation of median angle function
	* A More Efficient Way Of Obtaining A Unique Median Estimate For Circular Data
	* 2003 / B. Sango Otieno & Christine M. Anderson-Cook
	* from the annexes in https://digitalcommons.wayne.edu/cgi/viewcontent.cgi?referer=&httpsredir=1&article=1738&context=jmasm
	*
	*/

	/**

Sheraff / isometric_matrix_iteration.js

Created August 20, 2020 13:26

takes a 2D matrix and iterates over it in isometric order (diagonal by diagonal)

	const nbColumns = 5
	const nbRows = 5

	const matrix = new Array(nbColumns)
	.fill(null)
	.map(() => new Array(nbRows)
	.fill(null)
	.map(() => 0)
	)

Sheraff / a-star.js

Created August 21, 2020 19:42

	export default function (matrix, start, goal) {
	return aStar(
	matrix,
	start,
	goal,
	(cell) => heuristic(cell, goal),
	distance,
	)
	}

Sheraff / nothing.js

Created February 2, 2021 20:42 — forked from joakim/nothing.js

The concept of nothing in JavaScript (Crockford's idea of a better undefined)

	const nothing = new Proxy(Object.freeze(Object.create(null)), Object.create(null, {
	get: { value(target, property) {
	return property === Symbol.toPrimitive ? () => null : nothing }
	}
	}))

	nothing.foo === nothing // true
	nothing.foo.bar.baz[42].qux // nothing forever

	typeof nothing === "object" // true

Sheraff / sendBeacon.js

Last active July 3, 2021 08:38

send GET request even if user leaves page w/ `sendBeacon`

	// last reliably fired event before a user leaves
	document.addEventListener('visibilitychange', () => {
	if (document.visibilityState === 'hidden') {
	// queues up a request to be sent even if the user leaves
	navigator.sendBeacon('/log', analyticsData)
	}
	})

Sheraff / stack-overflow-react-snippet.md

Last active June 26, 2021 15:05

Stack Overflow code snippet with React hooks

const App = (props) => {
  var [count, setCount] = React.useState(0)

return (

Sheraff / codeswing.json

Last active July 2, 2021 06:55

Find all reachable cells

	{
	"scripts": [],
	"styles": [],
	"showConsole": true
	}

Sheraff / charsets.js

Last active June 27, 2021 08:18

Visual character count: filter out unicode marks

export const NON_SPACING_MARKS = new Set(['\u0300', '\u0301', '\u0302', '\u0303', '\u0304', '\u0305', '\u0306', '\u0307', '\u0308', '\u0309', '\u030A', '\u030B', '\u030C', '\u030D', '\u030E', '\u030F', '\u0310', '\u0311', '\u0312', '\u0313', '\u0314', '\u0315', '\u0316', '\u0317', '\u0318', '\u0319', '\u031A', '\u031B', '\u031C', '\u031D', '\u031E', '\u031F', '\u0320', '\u0321', '\u0322', '\u0323', '\u0324', '\u0325', '\u0326', '\u0327', '\u0328', '\u0329', '\u032A', '\u032B', '\u032C', '\u032D', '\u032E', '\u032F', '\u0330', '\u0331', '\u0332', '\u0333', '\u0334', '\u0335', '\u0336', '\u0337', '\u0338', '\u0339', '\u033A', '\u033B', '\u033C', '\u033D', '\u033E', '\u033F', '\u0340', '\u0341', '\u0342', '\u0343', '\u0344', '\u0345', '\u0346', '\u0347', '\u0348', '\u0349', '\u034A', '\u034B', '\u034C', '\u034D', '\u034E', '\u034F', '\u0350', '\u0351', '\u0352', '\u0353', '\u0354', '\u0355', '\u0356', '\u0357', '\u0358', '\u0359', '\u035A', '\u035B', '\u035C', '\u035D', '\u035E', '\u035F', '\u0360', '\u0361', '\

Flo Sheraff