Artem Sedliar stow1x

Group Array of JavaScript Objects by Key or Property Value

Implementation

const groupBy = key => array =>
  array.reduce((objectsByKeyValue, obj) => {
    const value = obj[key];
    objectsByKeyValue[value] = (objectsByKeyValue[value] || []).concat(obj);
    return objectsByKeyValue;

Vue.js and Vuex - best practices for managing your state

Modifying state object

Example

If you have to extend an existing object with additional property, always prefer Vue.set() over Object.assign() (or spread operator).

Example below explains implications for different implementations.

Про токены, JSON Web Tokens (JWT), аутентификацию и авторизацию. Token-Based Authentication

Last major update: 25.08.2020

Что такое авторизация/аутентификация
Где хранить токены
Как ставить куки ?
Процесс логина
Процесс рефреш токенов
Кража токенов/Механизм контроля токенов

What forces layout / reflow

All of the below properties or methods, when requested/called in JavaScript, will trigger the browser to synchronously calculate the style and layout*. This is also called reflow or layout thrashing, and is common performance bottleneck.

Generally, all APIs that synchronously provide layout metrics will trigger forced reflow / layout. Read on for additional cases and details.

Element APIs

Getting box metrics

elem.offsetLeft, elem.offsetTop, elem.offsetWidth, elem.offsetHeight, elem.offsetParent

	module.exports = {
	root: true,
	env: {
	browser: true,
	node: true,
	},
	parser: 'vue-eslint-parser',
	parserOptions: {
	parser: '@typescript-eslint/parser',
	sourceType: 'module',

	window.Clipboard = (function(window, document, navigator) {
	var textArea,
	copy;

	function isOS() {
	return navigator.userAgent.match(/ipad\|iphone/i);
	}

	function createTextArea(text) {
	textArea = document.createElement('textArea');

	/** Convert seconds to SMPTE timecode JSON object, example input is html video.currentTime */
	function secondsToSMPTE(seconds, framerate) {
	var f = Math.floor((seconds % 1) * framerate);
	var s = Math.floor(seconds);
	var m = Math.floor(s / 60);
	var h = Math.floor(m / 60);
	m = m % 60;
	s = s % 60;

	return {h: h, m: m, s: s, f: f};