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class Car
  class << self
    def advertise(model)
      puts "BUY IT NOW! #{model}"
    end

    def manufacture(make)

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def ask_for_age(name)
  # We have to ask for this person's age
  print "What is #{name}'s age? "

  rand(100) # gets.chomp.to_i
end


# Roomful of People

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class JavascriptGenerator < Rails::Generators::NamedBase

  def create_javascript_files
    create_file "app/assets/javascripts/#{file_name}.coffee", "# New JavaScript File"
    create_file "spec/javascripts/#{file_name}_spec.coffee", <<-SPEC

describe "test for #{file_name}", ->

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console: bundle exec rails console
rake: bundle exec rake
web: daemonized-worker & web
worker: worker

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# Expirable is a module that lets you easily cache
# groups of records, either across an entire record:
#   cache(Snippet) => cache(Snippet.cache_key)
# or, across a scope:
#   cache(page.blocks) => cache(page.blocks.cache_key)
#
# Why not just use `maximum(:updated_at)`?
# Because it requires 2 queries: the total count,
# and the updated_at timestamp

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 $(document).ready(function(){
   // Explicitly set the left positioning,
   // based on the current position calculated by the Browser.
   // This "locks" the sidebar to its current x-axis, even
   // when we change the positioning strategy in a moment
   $('#sidebar').css('left', $('#sidebar').offset().left + 'px');

   $(window).scroll(function(){
     // Has the visitor scrolled down past the headmast?
     // If the headmast is 100 pixels tall, and

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def calculator(operator, expression, *exprs)
  exprs.each { |n| expression = expression.send(operator, n) }
  expression
end

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 rails_admin do
    configure :expertise do
      bootstrap_wysihtml5 true
    end

    edit do
      group 'Login' do
        field :email
        field :password do
          visible false

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How to setup Heroku Hostname SSL with GoDaddy SSL Certificate and Zerigo DNS
Heroku recently added an exciting new 'Hostname SSL' option.  This option offers the broad compatibility of IP-based SSL, but at 1/5 the price ($20 / month at the time of this writing).  
 
The following tutorial explains how to use Heroku's new 'Hostname SSL' option on your Heroku project.  Before we begin, let's list what we're using here:

    * Heroku Hostname SSL
    * GoDaddy Standard SSL Certificate
    * Zerigo DNS

Note: I am not using the Heroku Zerigo DNS add-on, instead I have a separate Zerigo account for my DNS needs.  I do this because Zerigo offers 30 hosts on free direct accounts, versus only 10 hosts on the free Heroku add-on.

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def rpn expression
  stack = []

  expression.split(' ').each do |token|
    stack << if token =~ /\d/
      token
    else
      [stack.pop, stack.pop].map { |t| t.to_i }.inject do |sum, x|
        eval "#{x} #{token} #{sum}"
      end