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module AAA
  def abc
    "abc in AAA"
  end

  def not_in_common
    "not_in_common in AAA"
  end

end

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class Duck
 def quack
   "Quack quack"
 end
end

class Person
  def quack
    "Bad impression of Donald Duck"
  end

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# WheelType knows about the behavior of wheels
class WheelType
  def diameter
    #snip
  end

  def rim_size
    #snip
  end

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arr = []                          # => []
arr = Array.new                   # => []
arr = Array.new(5, "t")           # => ["t", "t", "t", "t", "t"]
arr = Array.new(5) { |i| i **2 }  # => [0, 1, 4, 9, 16]

arr[3] = 'replacement'   # => "replacement"
arr                      # => [0, 1, 4, "replacement", 16]
arr.fetch 0              # => 0
arr.first                # => 0
arr.last                 # => 16

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h1 = Hash.new          # => {}
h2 = Hash.new("a")     # => {}
h3 = {}                # => {}
h4 = {abc: "def"}      # => {:abc=>"def"}
h5 = {:abc => "def"}   # => {:abc=>"def"}
h6 = {"abc" => "def"}  # => {"abc"=>"def"}

h1["abc"]  # => nil

h1.fetch("abc", "kitty")  # => "kitty"

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/*

Prerequisite: meteor add peerlibrary:aws-sdk
Terminology: 
AWS: Amazon web services
S3: Simple storage service (one of the above.)


Create a bucket on S3. Use AWS Identity and Access Manager to create 
a user that your app can log in as . Attach a policy to that user 

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function doSumByGroup() {
  var agg = [
    {$group: {
      _id: "$columnObject",
      total: {$sum: 1}
    }}
  ];
 
  Snippet.aggregate(agg, function(err, logs){
    if (err) { 

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class CreateUsers < ActiveRecord::Migration
  def change
    create_table :users do |t|
      t.string :name
      t.string :email
      t.timestamps null: false
    end
  end
end

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#Creating an app called my_great_app

rails new my_great_app -T -d postgresql --skip-turbolinks
cd my_great_app
git init
git add .
git commit -m "Initial commit. Rails boilerplate."

# Edit gemfile
# #Remove the reference to coffee-rails.

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This is very well documented at https://devcenter.heroku.com/articles/getting-started-with-rails4

Short version:
Download heroku tool belt and install it. Then in terminal, cd into the root folder of the app you want to deploy

In the Gemfile declare ruby version with a line like:
ruby "2.1.4"

Also add 
gem 'rails_12factor', group: :production