yongjun21’s gists

yongjun21 / euclidean.ipynb

Last active September 24, 2020 11:52

Neat little trick to efficiently compute Euclidean distance in pandas

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yongjun21 / Promise.filter.js

Last active September 4, 2024 06:28

Complete implementation of Promise.filter

	Promise.filter = function (iterable, filterer, options = {}) {
	let concurrency = options.concurrency \|\| Infinity

	let index = 0
	const results = []
	const predicates = []
	const pending = []
	const iterator = iterable[Symbol.iterator]()

	while (concurrency-- > 0) {

yongjun21 / Promise.map.js

Last active September 4, 2024 06:28

Complete implementation of Promise.map

	Promise.map = function (iterable, mapper, options = {}) {
	let concurrency = options.concurrency \|\| Infinity

	let index = 0
	const results = []
	const pending = []
	const iterator = iterable[Symbol.iterator]()

	while (concurrency-- > 0) {
	const thread = wrappedMapper()

yongjun21 / delay.js

Last active May 29, 2023 02:59

Alternative implementation of timed delay decorators

	function delay (invoke, ms) {
	return (...args) => new Promise(resolve => {
	setTimeout(resolve, ms)
	}).then(() => invoke.apply(...args))
	}

	function delay2 (invoke, ms) {
	return (...args) => new Promise(resolve => {
	setTimeout(resolve, ms, invoke(...args))
	})

yongjun21 / Promise.waterfall.js

Last active May 29, 2023 03:00

Simple Promise.waterfall implementation

	Promise.waterfall = function (array, invoke) {
	let pending = Promise.resolve()
	const results = []

	for (const item of array) {
	pending = pending
	.then(() => invoke(item, i))
	.then(result => results.push(result))
	}

yongjun21 / Tooltip.vue

Created September 25, 2019 04:01

Tooltip that tracks position of a target element using mutation observer

yongjun21 / readLineByLine.js

Last active July 21, 2020 12:14

Helper function to read file line by line with small memory footprint. Returns a thenable that can be chained with `.filter` and `.map` methods

	const readline = require('readline')
	const fs = require('fs')

	module.exports = function (...args) {
	const transforms = []
	let state = 'pending'
	let error = null

	const rl = readline.createInterface({
	input: fs.createReadStream(...args)

yongjun21 / ObjectFitVideo.vue

Created May 28, 2019 09:04

Vue component to polyfill object-fit CSS property on videos

	<template>
	<video class="object-fit-video" v-bind="$attrs" v-on="$listeners" :style="videoStyle">
	<slot></slot>
	</video>
	</template>

	<script>
	const supportsObjectFit = window.CSS && window.CSS.supports &&
	window.CSS.supports('object-fit', 'cover') &&
	!/Edge/.test(window.navigator.userAgent)

yongjun21 / Promise.js

Last active May 17, 2019 07:37

Light weight Promise polyfill

	const Promise = window.Promise \|\| (function () {
	function PromiseLike (init) {
	let state = 'pending'
	let resolved, error
	const pendingResolve = []
	const pendingReject = []
	function resolve (value) {
	state = 'resolved'
	resolved = value
	pendingResolve.forEach(function (fn) { fn(value) })

yongjun21 / makeAnimated.js

Last active May 10, 2019 04:49

Turn any Vue component into an animated component

	import TweenLite from 'gsap/TweenLite'
	import {_ANIMATE_, currentAnimations, defaultConfig} from './shared'

	export default function (Target, animatedProps = []) {
	if (animatedProps.length === 0) return Target

	const props = {
	animation: Object
	}
	animatedProps.forEach(prop => { props[prop] = null })

	<template>
	<div class="tooltip" :style="style">
	<slot></slot>
	</div>
	</template>

	<script>
	export default {
	props: {
	target: {

Yong Jun yongjun21