Denis Izmaylov DenisIzmaylov

Key difference between OOP and FP in JavaScript

In OOP we have mixed instance data and class functions:

class Animal { 
  constructor(name) {
    this.name = name;
  }
 speak() {

Running a High Availability Service on CoreOS using Docker, Fleet, Flannel, Etcd, Confd & Nginx

View the diagram of what's going on: https://drive.google.com/file/d/0B74l6vUHf9HrMzNrYUlyMm40RWs/view?usp=sharing

Tools used:

coreos: server machine clustering via a shared cloud-config.yml
etcd: key value store for service registration and discovery
fleet: scheduling/failover of docker containers across coreos cluster
flannel: Gives each docker container a unique ip that allows you to access the internal port (i.e. port 80 not 32679)
confd: watch etcd for nodes arriving/leaving - template nginx configuration files / reload nginx on change

Telegram

Оглавление:

Как работают боты
Как завести бота
Как начать получать сообщения ботом
Документация
Пример бота
Некоторые источники данных

Как работают боты

JavaScript Best Practicies

Short articles, references and checklists to keep control of application quality.

Common
- Babel
Browser specific
- Fast Load
- DOM
Server specific

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

DigitalOcean Dokku / Node.js Cloud Environment

Custom recipe to get full Node.js Cloud Environment in DigitalOcean Dokku droplet running from scratch. Yes. Your own Heroku for $5 per month.

I use this gist to keep track of the important configuration steps required to have a functioning system after fresh install.

When you have executed that's all step by step you will get a new working and stable system which is ready to host & serve your Node.js application and databases.

Dokku installation
- Configure locale
Fix memory issues

OS X 10.11 (El Capitan) / Node.js and io.js Developer Environment

Custom recipe to get OS X 10.11 El Capitan running from scratch with useful applications and Node.js Developer environment. I use this gist to keep track of the important software and steps required to have a functioning system after fresh install.

	export default function renderRoute(request, reply) {
	const store = configureStore();
	store.dispatch(match(request.path, (error, redirectLocation, routerState) => {
	if (redirectLocation) {
	reply.redirect(redirectLocation.pathname + redirectLocation.search);
	} else if (error) {
	reply(error.message).code(500);
	} else if (!routerState) {
	reply('Not found').code(404);
	} else {

	function offset(count, offset, limit) {
	const finalOffset = Math.max(Math.min(count, offset), 0);
	const remainedCount = Math.min(count, count - finalOffset);
	const finalCount = (typeof limit === 'number') ? Math.min(limit, remainedCount) : remainedCount;
	return { offset: finalOffset, finalCount: finalCount };
	}

	console.log(offset(10, 0)); // {"offset":0,"finalCount":10}
	console.log(offset(10, 4)); // {"offset":4,"finalCount":6}
	console.log(offset(10, 10)); // {"offset":10,"finalCount":0}

	{
	"ru": {
	"Your original english text": "Твой оригинальный русский текст"
	}
	}