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                   	       	      (send request)
+--------+   (poll devices)  	           +----------+
| Device +--        client   server	 --+ Client   |
+--------+  \----   +------------+   ---/  +----------+
                 \--| EM Ruby  	 |--/
                -/  |     Serve- |  \--
             --/    +------------+     \-- +----------+
+--------+ -/       			  \+ Client   |
| Device +/         			   +----------+

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 module Hello

  class Test 
    attr_accessor :registers

    def initialize()
      @registers = []

      @registers << Alpha.new
      @registers << Beta.new

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require 'rubygems'

class Foo
  attr_accessor :mutex
  attr_accessor :started
  attr_accessor :running

  def initialize
    @mutex = Mutex.new
    @started = ConditionVariable.new

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(defun lat?
  (lambda (l)
    (cond
     ((null? l) #t)
     ((atom ? (car l)) (lat? (cdr l)))
     (else #f))))

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(defun double? (x)
  (lambda (x)
    (x * x)))

(double? 3)

;; (lambda (x) (x * x))

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# db/migrate/20140714041543_create_posts.rb

class CreatePosts < ActiveRecord::Migration
  def change
    create_table :posts do |t|
      t.string :title
      t.text :body

      t.timestamps
    end

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<table class='foo'>
  <thead>
    <tr class='header'>
      <th class='align-left' colspan='8'>Foo Details</th>
    </tr>
    <tr class='sub-header'>
      <th>Hidden</th>
    </tr>
  </thead>
  <tbody>

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  $(".hidden_comment").change ->                                                      
    enabled = false                                                                          
    if this.checked == true                                                                  
      enabled = true                                                                         
      alert ( $(this.target).attr("id") )   # undefined                                                  
    else                                                                                     
      alert ( $(this.target).attr("id") )   # undefined

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rows.each_with_index do |r, i|
...
  #myModal.reveal-modal{"data-reveal" => ""}                                                                                                                               
    = form_tag comments_path, :method => :post do                                                                                                   
      = select_tag :reason, options_for_select([['Like', '1'], ['Unlike', '2'], ['Other', '3']], params[:hidden])                  
      = text_area :comments, :rows => 5, :placeholder => '(optional)'                                                                                                      
      = button_tag "Cancel", :type => 'button', :onclick => "$('#myModal').foundation('reveal', 'close')"                                                                  
      = submit_tag "Submit", :type => 'button', :name => 'start', :onchange => "this.form.submit();"                                                                       
  = form_tag comment

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(defun atom? (x)
  (not (listp x)))

(atom? 'Harry) ; t
(atom? '(1 2 3)) ; nil

(defun member* (a list)
  (cond
   ((null list) nil)
   ((atom? (car list))