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// AES Encryption/Decryption with AES-256-GCM using random Initialization Vector + Salt
// ----------------------------------------------------------------------------------------
// the encrypted datablock is base64 encoded for easy data exchange. 
// if you have the option to store data binary save consider to remove the encoding to reduce storage size
// ----------------------------------------------------------------------------------------
// format of encrypted data - used by this example. not an official format
//
// +--------------------+-----------------------+----------------+----------------+
// | SALT               | Initialization Vector | Auth Tag       | Payload        |
// | Used to derive key | AES GCM XOR Init      | Data Integrity | Encrypted Data |

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// time and time end
console.time("This");
let total = 0;
for (let j = 0; j < 10000; j++) {
  total += j
}
console.log("Result", total);
console.timeEnd("This");

// Memory

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# 0 is too far from ` ;)
set -g base-index 1

# Automatically set window title
set-window-option -g automatic-rename on
set-option -g set-titles on

#set -g default-terminal screen-256color
set -g status-keys vi
set -g history-limit 10000

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abstract class AuthService {
  // Subject tracks the current token, or is null if no token is currently
  // available (e.g. refresh pending).
  private subject = new BehaviorSubject<string|null>(null);

  readonly refreshToken: Observable<any>;
  readonly token: Observable<string>;

  constructor() {
    // refreshToken, when subscribed, gets the new token from the backend,

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# Redis Cheatsheet
# All the commands you need to know


redis-server /path/redis.conf  # start redis with the related configuration file
redis-cli                      # opens a redis prompt


# Strings.

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Two way iframe communication

The main difference between the two pages is the method of sending messages. Recieving messages is the same in both.

Parent

Send messages to iframe using iframeEl.contentWindow.postMessage Recieve messages using window.addEventListener('message')

iframe

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Handlebars es un sistema de plantillas web semantico iniciado por Yehuda Katz en el 2010.
Handlebars.js es una extensión de Mustache, y además de renderear plantillas propias de Handlebars, 
puede renderear plantillas Mustache.
More: http://handlebarsjs.com/
      http://mustache.github.io/mustache.5.html

1. Expresiones.

1.1 Uso básico.

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How to setup Let's Encrypt for Nginx on Ubuntu 16.04 (including IPv6, HTTP/2 and A+ SLL rating)

There are two main modes to run the Let's Encrypt client (called Certbot):

• Standalone: replaces the webserver to respond to ACME challenges
• Webroot: needs your webserver to serve challenges from a known folder.

Webroot is better because it doesn't need to replace Nginx (to bind to port 80).

In the following, we're setting up mydomain.com. HTML is served from /var/www/mydomain, and challenges are served from /var/www/letsencrypt.