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Performance focused

David Rivera jherax

Performance focused
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jherax / absmartly.config.json
Last active April 19, 2022 06:02
ABSmartly configuration test
"assignments": [
"pathName": "/",
"variant": 1,
"configs": [{
"apiTarget": "/content/landingpage/MEDICARE/",
"replacements": {
"data": {
jherax / get-headers.ts
Last active April 19, 2021 15:34
Gets all Response Headers for the current document
* Gets all Reponse Headers for the current document.
* @returns An object cointaining the key-value pairs for each header
function getHeaders(url = document.location.href) {
const req = new XMLHttpRequest();"GET", url, false);
let key: string;
jherax /
Created June 15, 2020 18:09 — 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.

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
jherax / App.js
Last active October 23, 2023 01:15 — forked from koistya/App.js
How to add `onscroll` event with requestAnimationFrame in ReactJS component
import React from 'react';
let lastScrollY = 0;
let ticking = false;
class App extends React.Component {
componentDidMount() {
window.addEventListener('scroll', this.handleScroll);
jherax /
Last active January 29, 2024 17:26
Debugging with VS Code

VS Code: Debugging

The way we usually debug JavaScript code, is through a web browser and typing the keyword debugger or console.log in our files, but switching between browser and VS Code can be annoying, and we also lose synchronization with the source code.

VS Code provides the extension Debugger for Chrome which enables you to edit, debug, and set breakpoints to your JavaScript

jherax /
Last active April 6, 2024 08:42
VS Code: Debugging with Jest

VS Code: Debugging Jest

Sometimes, debugging with console.log is not enough to find out what is happening in the code, as console.log prints only plain objects but neither functions nor objects with circular references. Besides, it's possible you may need to know the context and flow of the code.

Read more about debugging with VS Code in VS Code: Debugging.

jherax / index.html
Created January 8, 2019 23:16
Disable auto-zoom in input elements - For Safari, iPhone
<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=0, shrink-to-fit=no" />
jherax /
Last active February 12, 2024 19:37 — forked from bsara/
Setup SSH Authentication for Git Bash on Windows

Setup SSH Authentication for Git Bash on Windows


  1. Create a folder at the root of your user home folder (Example: C:/Users/username/) called .ssh.
    You can run something like: mkdir -p ~/.ssh
  2. Create the following files if they do not already exist (paths begin from the root of your user home folder):
jherax /
Last active February 12, 2024 14:53
Git Alias and Rebase

Git Alias and Git Rebase


After each commit in our branch, in order to be up-to-date with the integration branch.

jherax / subl
Created March 14, 2018 15:33 — forked from cmalard/subl
Cygwin + Sublime Text 3 : works with files and Git
# To create in [.babun/]cygwin/usr/local/bin/subl with chmod +x
while test $# -gt 0
ARGS="$ARGS ${1#/cygdrive/[a-zA-Z]}"; # Remove /cygdrive and disk letter from the path