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## 0_howto_install_phantomjs.md

      
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                / 0_howto_install_phantomjs.md
            
            
              Created
              May 13, 2018 18:01
                — forked from julionc/00.howto_install_phantomjs.md
            
              
                How to install PhantomJS on Debian/Ubuntu
              
          
    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


## blockchain.rb
# 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

## simplifying_has_many_through.rb
# 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',

## seconds to humanize
def humanize secs
  [[60, :seconds], [60, :minutes], [24, :hours], [1000, :days]].inject([]){ |s, (count, name)|
    if secs > 0
      secs, n = secs.divmod(count)
      s.unshift "#{n.to_i} #{name}"
    end
    s
  }.join(' ')
end
	# 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
	# 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',
	def humanize secs
	[[60, :seconds], [60, :minutes], [24, :hours], [1000, :days]].inject([]){ \|s, (count, name)\|
	if secs > 0
	secs, n = secs.divmod(count)
	s.unshift "#{n.to_i} #{name}"
	end
	s
	}.join(' ')
	end