Bruno Carvalho de Araujo brunocarvalhodearaujo

Standard JS in create-react-app

I've been using create-react-app lately as I find it very useful to kick things off while starting a project. I almost always follow JavaScript Standard Style and I found myself googling it so I figured out I should write it down.

Get Standard JS

I really like keeping dependencies as local as possible but if you prefer you can install it globally.

yarn add standard --dev

or

Concurrency in JavaScript

Javascript is a programming language with a peculiar twist. Its event driven model means that nothing blocks and everything runs concurrently. This is not to be confused with the same type of concurrency as running in parallel on multiple cores. Javascript is single threaded so each program runs on a single core yet every line of code executes without waiting for anything to return. This sounds weird but it's true. If you want to have any type of sequential ordering you can use events, callbacks, or as of late promises.

My Openshift Cheatsheet

Project Quotes, Limits and Templates

Cluster Quota

oc create clusterquota env-qa \
    --project-label-selector environment=qa \
    --hard pods=10,services=5
    
oc create clusterquota user-qa \

Moved to git repository: https://github.com/denji/nginx-tuning

NGINX Tuning For Best Performance

For this configuration you can use web server you like, i decided, because i work mostly with it to use nginx.

Generally, properly configured nginx can handle up to 400K to 500K requests per second (clustered), most what i saw is 50K to 80K (non-clustered) requests per second and 30% CPU load, course, this was 2 x Intel Xeon with HyperThreading enabled, but it can work without problem on slower machines.

You must understand that this config is used in testing environment and not in production so you will need to find a way to implement most of those features best possible for your servers.

Never touch your local /etc/hosts file in OS X again

To setup your computer to work with *.test domains, e.g. project.test, awesome.test and so on, without having to add to your hosts file each time.

Requirements

Homebrew
Mountain Lion -> High Sierra

	// Mixin like functionality

	const textInput = props => `
	color: ${props.error ? color.white : color.base};
	background-color: ${props.error ? color.alert : color.white};
	`;

	export const Input = styled.input`
	${textInput}
	`;

	'use strict';

	const internals = {};

	exports.errors = {
	root: 'value',
	key: '"{{!key}}" ',
	messages: {
	wrapArrays: true
	},

	package test

	import scala.concurrent.duration._

	import io.gatling.core.Predef._
	import io.gatling.http.Predef._
	import io.gatling.jdbc.Predef._

	class LoginTest extends Simulation {

	var LatLngList = new Array (new google.maps.LatLng (52.537,-2.061), new google.maps.LatLng (52.564,-2.017));
	// Create a new viewpoint bound
	var bounds = new google.maps.LatLngBounds ();
	// Go through each...
	for (var i = 0, LtLgLen = LatLngList.length; i < LtLgLen; i++) {
	// And increase the bounds to take this point
	bounds.extend (LatLngList[i]);
	}
	// Fit these bounds to the map
	map.fitBounds (bounds);

	function CalcRadiusDistance(lat1, lon1, lat2, lon2) {
	var RADIUSMILES = 3961,
	RADIUSKILOMETERS = 6373,
	latR1 = this.deg2rad(lat1),
	lonR1 = this.deg2rad(lon1),
	latR2 = this.deg2rad(lat2),
	lonR2 = this.deg2rad(lon2),
	latDifference = latR2 - latR1,
	lonDifference = lonR2 - lonR1,
	a = Math.pow(Math.sin(latDifference / 2), 2) + Math.cos(latR1) * Math.cos(latR2) * Math.pow(Math.sin(lonDifference / 2), 2),