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puts "Experiment... don't use this on a big chunk of code."

if RUBY_VERSION != "1.9.3"
  throw "This has only been tested on Ruby 1.9.3"
end

require 'stringio'
require 'pp'

class Tracer

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# A simple string helper compatible with both 1.8 and 1.9. Avoids 
# duplication of force_encoding('utf-8').
class String
  def utf8
    respond_to?(:force_encoding) ? force_encoding('utf-8') : self
  end
end

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if RUBY_VERSION =~ /1\.8/
  class String
    def force_encoding(encoding)
      self
    end
  end
end

# 1.8.7 :025 > Benchmark.ms { 10000.times { x = "" } }
# => 2.4268627166748 

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require 'active_support/concern'
module AverageColumnLength
  extend ActiveSupport::Concern

  # Returns a map of column names to their average row
  # length (in bytes), based on a +sample_size+ of rows. 
  # Warning +random=true+ slows it down.
  #
  # The +avg_row_length+ returned from MySQL's +SHOW 
  # TABLE STATUS+ is often innacurate. You can calculate 

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x = Hash.new(0)
orig = ObjectSpace.count_objects
set_trace_func proc { |event, file, line, id, binding, classname| 
  ObjectSpace.each_pair { |k,v|  
    x["#{file}:#{line}:#{k}"] += [0,(v - orig[k])].max
  }
}

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# The method Array#one? in ruby is intended to be used with a block. It does *not* signify that 
# there is one element in the array:

1.8.7 :066 > [1,2,3].one?
 => false 
1.8.7 :067 > [1,nil,nil].one?
 => true 

# Also, it is slower than just checking the array's size:

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# Add the graphiz gem to your Gemfile
gem "ruby-graphviz" 

# And in the rails console, try the following:
require 'graphviz'
arel = User.where(:name => "Sadako Yamamura").where(:location => "Tokyo").limit(1).arel 
graph = GraphViz.parse_string(arel.to_dot)
graph.output(:png => "user_query.png")

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// Key difference: the old way of using {write,read}_inheritable_attribute was
// a *static default* for child classes. The new way of using class_attribute is a 
// *dynamic default*.

class A
  class_attribute :foo
  self.foo = 1
end
class B < A; end
class C < B; end

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class SomeClass
  self.instance_variable_set('@my_attribute', {:class => true})
  def self.my_attribute; @my_attribute; end

  def self.inherited(klass)
    val = self.instance_variable_get('@my_attribute')
    klass.instance_variable_set('@my_attribute', val.duplicable? ? val.dup : val)
    super
  end
end

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boxee.apiMinVersion=7.0;
boxee.reloadOnPageChange = true;
boxee.setMode(boxee.CURSOR_MODE);
boxee.onKeyboardKeyDown = function() {
  document.write("TIEG")
}

boxee.onMouseMoveDown = function() { 
  document.write("MOUSE MOVE DOWN");
}