edulan’s gists

edulan / index.html

Created July 3, 2020 17:41

Sticky scroll spy example

	<!DOCTYPE html>
	<html lang="en">
	<head>
	<meta charset="UTF-8">
	<meta name="viewport" content="width=device-width, initial-scale=1.0">
	<title>Sticky scroll spy example</title>

	<style>
	html {
	scroll-behavior: smooth;

edulan / index.js

Created May 18, 2020 23:54

Custom base32 generator

	const ALPHABET = "RKYM5C4H07P9EGWJ1BZQ8V3S62FXNTDA"
	const BASE_LENGTH = ALPHABET.length
	const SHORT_CODE_LENGTH = 6

	function toBase (input) {
	let number = input

	if (number === 0) {
	return ALPHABET[0]
	}

edulan / gist:4f18295627f7a5af7d94141dc7e8b1bf

Created February 20, 2020 20:57

	#!/usr/bin/env node
	const readline = require("readline");

	const lines = [];

	function sortBooks(a, b) {
	if (a.score > b.score) return 1;
	if (a.score < b.score) return -1;
	return 0;
	}

edulan / solve.js

Last active February 19, 2020 20:20

	#!/usr/bin/env node

	require("lodash.combinations");
	const { flatMap, combinations } = require("lodash");
	const readline = require("readline");

	const lines = [];

	function processInput(lines) {
	const [firstLine, lastLine] = lines;

edulan / primes.js

Created July 19, 2018 09:10

Sieve of Eratosthenes

	function * generateMultiplesOf (number) {
	for (let factor = 2;; factor++) {
	yield number * factor
	}
	}

	function * generatePrimes (maxNumber = 1000) {
	const firstPrime = 2
	const nonPrimeNumbers = new Set()

edulan / rx_photobooth.js

Last active April 19, 2018 15:32

Rx photobooth, take 4 photos with a 5 seconds countdown between them

	const takePhoto = () => new Promise((resolve) => (setTimeout(resolve, Math.random() * 1E3 + 5E2, 'photo')))

	const makeCountdown = (seconds) =>
	Rx.Observable
	.concat(
	Rx.Observable
	.interval(1E3)
	.take(seconds),
	Rx.Observable.defer(() => takePhoto())
	)

edulan / rx_take_latest.js

Created November 28, 2017 18:07

Rx take latest

	const simulateTask = () => new Promise((resolve) => (setTimeout(resolve, Math.random() * 1E3 + 500)))

	const click$ = Rx.Observable
	.fromEvent(document, 'click')
	.scan((clickCount) => clickCount + 1, 0)

	click$.switchMap(
	() => Rx.Observable.fromPromise(simulateTask()),
	(clickCount) => clickCount
	)

edulan / app.js

Last active October 22, 2017 22:28

App component

	class App extends PureComponent {
	constructor (props) {
	super(props)

	this.state = {
	term: props.term,
	items: [],
	errorMessage: null
	}

edulan / idle_timer.js

Last active October 2, 2017 16:03

Idle timer

	function createIdleTimer (delay = 5E3) {
	const IDLE_POLL_TIMEOUT = 1E2

	const events = ['mousemove', 'mousedown', 'keydown', 'touchstart', 'scroll']

	return new Promise((resolve) => {
	let idle = true
	let timeout = null
	let lastTimestamp = null
	let elapsedTimeInMillis = 0

edulan / sliceBy.js

Last active August 1, 2017 10:15

Slice a string by given chunk sizes

	function sliceBy(str, [ chunkSize = -1, ...rest ] = []) {
	// Guard against infinite recursion
	if (chunkSize < 1) {
	return [str]
	}

	if (str.length <= chunkSize) {
	return [str]
	}

Eduardo Lanchares edulan