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Nines of Reliability: (Hours / Minutes / Seconds)
2 9's (99%) = up to 87.6h / 5256.0m / 315360.0 seconds of downtime per year.
3 9's (99.9%) = up to 8.76h / 525.6m / 31536.0 seconds of downtime per year.
4 9's (99.99%) = up to 0.876h / 52.559999999999995m / 3153.6 seconds of downtime per year.
5 9's (99.999%) = up to 0.0876h / 5.256m / 315.36 seconds of downtime per year.
6 9's (99.9999%) = up to 0.00876h / 0.5256000000000001m / 31.536 seconds of downtime per year.
7 9's (99.99999%) = up to 8.76E-4h / 0.05256m / 3.1536 seconds of downtime per year.

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class Person
  attr_accessor :name
end

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#########################################
#
#  ==Keeps count of number of times key has been added.==
#
#  Use:
#    hsh = Hash.counter_hsh
#    hsh << :foo
#    hsh << :foo << :foo
#    hsh << "foo"
#

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moby = <<EOL
Call me Ishmael. Some years ago - never mind how long precisely - having little
or no money in my purse, and nothing particular to interest me on shore, I
thought I would sail about a little and see the watery part of the world.
[Moby Dick - 1st paragraph]
EOL

#
# "."  - matches any character
# "\s" - matches digits (0-9)

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#
#  The interesting world of public, private, and protected.
#
#  Publics - Work as expected
#
#  Privates - Work as expected, except:
#    You can send a symbol of the private method as an end around
#    Classes can call the privates of their superclasses
#
#  Protected - Instances of the same class can call each others protecteds, whut?!

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############################
#
#  The world is your oyster.  Unless you overload it.
#  Then it can be anything your heart desires.
#
#  Very few operators can't be overloaded:  and, or, not, &&, ||
#
class Person

  attr_reader   :my_bag

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#! /usr/bin/env ruby
require 'benchmark'

#
#  Benchmarking cmd-line tool
#
#
# $ bench_it.rb  "x = 5; 100.times { x * 5 }" "(1..1000).to_a.inject(:+)" --times=500
#
# EXAMPLE OUTPUT

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module Algoruby
  module Sort
    #
    # === Counting Sort ===
    #
    # Best:   O(n)  [linear]
    # Avg:    O(n)  [linear]
    # Worst:  O(n)  [linear]
    #
    module Counting

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module Greeting
  extend self

  def say_hello(greetable = self)
    puts greetable.greeting
  end
end

class Person
  attr_accessor :greeting

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class Hash
  def symbolize_keys
    inject(Hash.new) do |result, (k, v)|
      key = k.is_a?(String) ? k.to_sym : k
      val = v.is_a?(Hash) ? v.symbolize_keys : v
      result[key] = val
      result
    end
  end