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How to install PhantomJS on Ubuntu

Version: 1.9.8

Platform: x86_64

First, install or update to the latest system software.

sudo apt-get update
sudo apt-get install build-essential chrpath libssl-dev libxft-dev

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# https://medium.com/crypto-currently/lets-build-the-tiniest-blockchain-e70965a248b
# http://ruby-for-beginners.rubymonstas.org/writing_classes/self.html
# https://stackoverflow.com/questions/33768598/ruby-sha-256-hexidigest-values-are-different-from-what-python-generates

require 'rubygems'
require 'digest'

class Block
  def initialize(index, timestamp, data, previous_hash)
    @index = index

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# ~/.ssh/config
Host bitbucket-apple
  Hostname bitbucket.org
  User git
  IdentityFile ~/.ssh/apple
Host bitbucket-orange
  Hostname github.com
  User git
  IdentityFile ~/.ssh/orange

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# if-else
user = { age: 17, status: 'active' }
if user[:status] == 'active'
  user[:age] >= 18 ? 'allowed' : 'not allowed'
else
  user[:age] >= 18 ? 'ok' : 'no'
end

# hash
status = user[:status] == 'active' ? :active : :inactive

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import React, { Component } from 'react';
import { FieldArray, reduxForm } from 'redux-form';
import RenderItem from './render-item';

class Form extends Component {
  renderItems = ({ fields }) => {
    {
      fields.map((field, i) =>
        <RenderItem
          key={`condition-${i}`}

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class Collection < ActiveRecord::Base
  has_many :collectings
  accepts_nested_attributes_for :collectings, allow_destroy: true
end

class Collecting < ActiveRecord::Base
  COLLECTABLE = [:category, :product].freeze

  belongs_to :collection
  belongs_to :collectable, polymorphic: true

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# I got this script from turbolinks compatibility
#
# reed.github.io/turbolinks-compatibility

$ ->
  loadFacebookSDK()
  bindFacebookEvents() unless window.fbEventsBound

bindFacebookEvents = ->
  $(document)

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# Run this script with `$ ruby has_much_fun.rb`
require 'sqlite3'
require 'active_record'

# Use `binding.pry` anywhere in this script for easy debugging
require 'pry'

# Connect to an in-memory sqlite3 database
ActiveRecord::Base.establish_connection(
  adapter: 'sqlite3',

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# controllers/admin/application_controller.rb

class Admin::ApplicationController < ApplicationController
  before_action :authenticate_admin!

  layout 'admin'
end

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# SSL_connect returned=1 errno=0 state=SSLv3 read server certificate B: certificate verify failed

export $SSL_CERT_FILE=/usr/local/etc/openssl/cert.pem
curl http://curl.haxx.se/ca/cacert.pem -o $SSL_CERT_FILE
curl http://curl.haxx.se/ca/cacert.pem -o /usr/local/etc/openssl/cert.pem