Denis Savenok designeng

Git Cheat Sheet

Although there are enough resources on the web about Git, I will keep this one for my own reference. Minimal Git version required 1.7.2.

Deploy nodejs app with gitlab.com and pm2

This manual is about setting up an automatic deploy workflow using nodejs, PM2, nginx and GitLab CI. It is tested on:

Target server: Ubuntu 16.04 x64. This is suitable for Ubuntu 14.x.
Windows 10 on my PC to work.

Hidden classes in JavaScript and Inline Caching

Knowing how internals work is always a good. Pretty much for everything. Cars, trains, computers, you name it. It gives you an insight on what happens under the hood. You also act/react differently based on this knowledge.

As you might have guessed, it’s also true for web development. Knowledge of CSS transitions allows you to achieve better performance and not to use JavaScript in most cases. Knowledge of V8 internals allows you to write more performant JavaScript code. So let’s talk about V8 a little.

A little about V8

V8 is a JavaScript engine built by Google. Firefox built SpiderMonkey, Opera built Carakan and Microsoft built Chakra. One very important difference between V8 and other JavaScript engines is that V8 doesn’t generate any intermediate code. It compiles JavaScr

	#!/bin/bash

	ROOT_UID=0 # Only users with $UID 0 have root privileges.
	E_NOTROOT=87 # Non-root exit error.

	# Run as root only (sudo counts)
	if [ "$UID" -ne "$ROOT_UID" ]
	then
	echo "You need root priveledges to run this script"
	exit $E_NOTROOT

Service	Type	Storage	Limitations
Amazon DynamoDB	⚠️ Proprietary NoSQL	25 GB	⚠️ Payment method required
Amazon RDS	⚠️ Proprietary RDBMS		⚠️ Only free for 1 year
Azure SQL Database	MS SQL Server		⚠️ Only free for 1 year
👉 Clever Cloud	PostgreSQL, MySQL, MongoDB, Redis	256 MB (PostgreSQL)	Max 5 connections (PostgreSQL)

	/*

	MIT No Attribution

	Permission is hereby granted, free of charge, to any person obtaining a copy of this
	software and associated documentation files (the "Software"), to deal in the Software
	without restriction, including without limitation the rights to use, copy, modify,
	merge, publish, distribute, sublicense, and/or sell copies of the Software, and to
	permit persons to whom the Software is furnished to do so.


	/*An object created to parse through a large number of HTML
	blocks quickly. Used with cheerio.js. Begin via:
	parse.run($('some-div')[0])
	*/

	var fs = require('fs'),
	cheerio = require('cheerio');

	var Parse = function(block) {

	const Promise = require('bluebird');
	const fs = require('fs');
	const execa = require('execa');

	class BlueGreenDeployment {
	constructor({appName, blueProxyPassPattern, greenProxyPassPattern, nginxConfigFile}) {
	this.appName = appName;
	this.blueProxyPassPattern = blueProxyPassPattern;
	this.greenProxyPassPattern = greenProxyPassPattern;
	this.nginxConfigFile = nginxConfigFile;

	// NOTE: I previously suggested doing this through Grunt, but had plenty of problems with
	// my set up. Grunt did some weird things with scope, and I ended up using nodemon. This
	// setup is now using Gulp. It works exactly how I expect it to and is WAY more concise.
	var gulp = require('gulp'),
	spawn = require('child_process').spawn,
	node;

	/**
	* $ gulp server
	* description: launch the server. If there's a server already running, kill it.

Denis Savenok designeng

Git Cheat Sheet

TOC

Deploy nodejs app with gitlab.com and pm2

Hidden classes in JavaScript and Inline Caching

A little about V8