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.
elem.offsetLeft, elem.offsetTop, elem.offsetWidth, elem.offsetHeight, elem.offsetParent
| // array utils | |
| // ================================================================================================= | |
| const combine = (...arrays) => [].concat(...arrays); | |
| const compact = arr => arr.filter(Boolean); | |
| const contains = (() => Array.prototype.includes | |
| ? (arr, value) => arr.includes(value) | |
| : (arr, value) => arr.some(el => el === value) |
| The MIT License (MIT) | |
| Copyright (c) 2014 Tomas Kafka | |
| Permission is hereby granted, free of charge, to any person obtaining a copy | |
| of this software and associated documentation files (the "Software"), to deal | |
| in the Software without restriction, including without limitation the rights | |
| to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | |
| copies of the Software, and to permit persons to whom the Software is | |
| furnished to do so, subject to the following conditions: |
(by @andrestaltz)
If you prefer to watch video tutorials with live-coding, then check out this series I recorded with the same contents as in this article: Egghead.io - Introduction to Reactive Programming.
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| // Load the TCP Library | |
| net = require('net'); | |
| // Keep track of the chat clients | |
| var clients = []; | |
| // Start a TCP Server | |
| net.createServer(function (socket) { | |
| // Identify this client |
