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# lib/party_web/components/example_component.ex
defmodule PartyWeb.ExampleComponent do
  @moduledoc """
  An example LiveComponent under test.
  """
  use Phoenix.LiveComponent

  def render(assigns) do
    ~H"""
    <div>

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/**
 *  Cryptography Functions
 *
 *  Forked from AndiDittrich/AesUtil.js
 *  https://gist.github.com/AndiDittrich/4629e7db04819244e843
 */

import crypto, { CipherGCM, CipherGCMTypes, DecipherGCM } from 'crypto';
import { Password } from './types';

barkerja

What's new in Kino Bumblebee v0.1.3

Mix.install(
  [
    {:kino_bumblebee, "~> 0.1.3"},
    {:exla, "~> 0.4.1"}
  ],
  config: [nx: [default_backend: EXLA.Backend]]
)

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CREATE SEQUENCE public.global_id_seq;
ALTER SEQUENCE public.global_id_seq OWNER TO postgres;

CREATE OR REPLACE FUNCTION public.id_generator()
    RETURNS bigint
    LANGUAGE 'plpgsql'
AS $BODY$
DECLARE
    our_epoch bigint := 1314220021721;
    seq_id bigint;

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Latency Comparison Numbers
--------------------------
L1 cache reference                           0.5 ns
Branch mispredict                            5   ns
L2 cache reference                           7   ns                      14x L1 cache
Mutex lock/unlock                           25   ns
Main memory reference                      100   ns                      20x L2 cache, 200x L1 cache
Compress 1K bytes with Zippy             3,000   ns        3 us
Send 1K bytes over 1 Gbps network       10,000   ns       10 us
Read 4K randomly from SSD*             150,000   ns      150 us          ~1GB/sec SSD

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React.js

What is React.js?

React is a "declarative, efficient, and flexible Javascript library for building user interfaces." It was created by Facebook, first deployed in 2011, and was open-sourced in 2013. It is one of many answers to everyone's favorite question: "how should we structure Javascript applications on the web?"

Goal:

Minimize the amount of mutation that developers have to deal with by totally redoing the view every time that the data on a page changes. The developer writes the code for the page's first load but never has to account for modifications since every change to the page is treated like that initial render!

barkerja

/*  Sometimes it's pretty easy to run ito troubles with React ES6 components.
    Consider the following code: */

class EventStub extends Component {
  componentDidMount() {
    window.addEventListener('resize', this.onResize.bind(this)); //notice .bind
  }
  
  componentWillUnmount() {
    window.removeEventListener('resize', this.onResize.bind(this));

barkerja

# to generate your dhparam.pem file, run in the terminal
openssl dhparam -out /etc/nginx/ssl/dhparam.pem 2048

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OS X Screencast to animated GIF

This gist shows how to create a GIF screencast using only free OS X tools: QuickTime, ffmpeg, and gifsicle.

Instructions

To capture the video (filesize: 19MB), using the free "QuickTime Player" application:

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namespace :db do
  namespace :enable do
    desc "enable hstore extension"
    task :hstore => [:environment, :load_config] do
      ActiveRecord::Base.connection.execute('CREATE EXTENSION IF NOT EXISTS hstore;')
    end
  end

  Rake::Task['db:schema:load'].enhance ['db:enable:hstore']
end