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benfluleck /
Created Nov 16, 2019 — forked from paulirish/
What forces layout/reflow. The comprehensive list.

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.


Box metrics
  • elem.offsetLeft, elem.offsetTop, elem.offsetWidth, elem.offsetHeight, elem.offsetParent
  • elem.clientLeft, elem.clientTop, elem.clientWidth, elem.clientHeight
  • elem.getClientRects(), elem.getBoundingClientRect()
benfluleck /
Created Sep 4, 2019 — forked from sebmarkbage/
Why is React doing this?

I heard some points of criticism to how React deals with reactivity and it's focus on "purity". It's interesting because there are really two approaches evolving. There's a mutable + change tracking approach and there's an immutability + referential equality testing approach. It's difficult to mix and match them when you build new features on top. So that's why React has been pushing a bit harder on immutability lately to be able to build on top of it. Both have various tradeoffs but others are doing good research in other areas, so we've decided to focus on this direction and see where it leads us.

I did want to address a few points that I didn't see get enough consideration around the tradeoffs. So here's a small brain dump.

"Compiled output results in smaller apps" - E.g. Svelte apps start smaller but the compiler output is 3-4x larger per component than the equivalent VDOM approach. This is mostly due to the code that is usually shared in the VDOM "VM" needs to be inlined into each component. The tr

View index.js
import React from 'react'
import Text from '<atoms>/Text/Text'
import { useState } from 'react'
export const useForm = (initialValues) => {
const [values, setValues] = useState(initialValues)
benfluleck / server.js
Last active May 5, 2019
HTTPS node server
View server.js
var express = require('express');
var app = express();
var fs = require('fs');
var https = require('https');
var key = fs.readFileSync('key.pem');
var cert = fs.readFileSync( 'cert.pem' );
View inventoryRequest.js
// BAD
class InventoryRequester {
constructor() {
this.REQ_METHODS = ['HTTP'];
requestItem(item) {
// ...
benfluleck / posts.js
Created Apr 28, 2019
Interface segregation principle
View posts.js
// bad
class Post {
console.log('Post edited')
benfluleck / Bird.js
Last active Apr 28, 2019
Liskov Substitution Principle
View Bird.js
// bad
class Bird{
console.log('I can fly')
class Duck extends Bird {
benfluleck / Bird.js
Last active Apr 28, 2019
Open Closed Principle
View Bird.js
// Bad
class Bird{}
class FlyingBird extends Bird {
constructor(type, name){
super(); = name
if( === "parrot" || === "dove"){
return ('I can fly medium-fast')
benfluleck / singleResponsiblity.js
Last active Apr 28, 2019
Single Responsibility
View singleResponsiblity.js
// Bad Case
class Staff {
constructor(staff) {
this.staff = staff;
registerStaff(staff) {
if (this.validateUser(staff)) {
return `${staff} has been created`;
benfluleck / depthFirstSearch.JS
Last active Apr 27, 2019
Depth First Search
View depthFirstSearch.JS
function Node(value){
this.value = value
this.left = null;
this.right = null;
Node.prototype.toString = function() {
return this.value;
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