Hamza Erbay hamzaerbay

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.

Element

Box metrics

elem.offsetLeft, elem.offsetTop, elem.offsetWidth, elem.offsetHeight, elem.offsetParent
elem.clientLeft, elem.clientTop, elem.clientWidth, elem.clientHeight
elem.getClientRects(), elem.getBoundingClientRect()

	/**
	* Creates and returns a debounced version of the provided function.
	* The debounced version of the function will delay the invoking of the
	* original function until after a specified number of milliseconds have
	* passed since the last time the debounced function was invoked.
	*
	* @param {Function} callback - The function to debounce.
	* @param {number} delay - The number of milliseconds to delay invocation.
	* @returns {Function} - The debounced version of the provided function.
	*/

	import React from 'react';
	import videojs from 'video.js';
	import 'video.js/dist/video-js.css';

	// video.js player from the docs: https://github.com/videojs/video.js/blob/master/docs/guides/react.md

	class VideoPlayer extends React.Component {
	componentDidMount() {
	// instantiate Video.js
	this.player = videojs(this.videoNode, this.props, function onPlayerReady() {

	// Higher order Functions

	// 1. Accept a function as an argument
	// 2. Returns a new function

	const withCount = fn => {
	let count = 0;
	return (...args) => {
	console.log(`calls count ${++count}`);
	return fn(...args);



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