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>> alien = true
>> speaks_english = false

# 1
>> alien and speaks_english ? 'hello' : '**silence**'
=> "**silence**"

# 2
>> alien && speaks_english ? 'hello' : '**silence**'
=> "**silence**"

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module ActionController
  class MiddlewareStack < Array
    class Middleware
      attr_reader :klass, :args, :block

      def initialize(klass, *args, &block)
        @klass = klass.is_a?(Class) ? klass : klass.to_s.constantize
        @args = args
        @block = block
      end

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# activesupport/lib/active_support/core_ext/module/delegation.rb

class Module
  def delegate(*methods)
    options = methods.pop
    unless options.is_a?(Hash) && to = options[:to]
      raise ArgumentError, "Delegation needs a target. Supply an options hash with a :to key as the last argument (e.g. delegate :hello, :to => :greeter)."
    end

    if options[:prefix] == true && options[:to].to_s =~ /^[^a-z_]/

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>> "hello" & "goodbye"
NoMethodError: undefined method `&' for "hello":String
        from (irb):31
>> 1 & 2
=> 0

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>> hammer_of_truth = true
>> anvil_of_false = false

>> sword = hammer_of_truth && anvil_of_false
=> false
>> sword
=> false

>> sword = hammer_of_truth and  anvil_of_false
=> false

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>> !!active
=> true

>> active = false
=> false

>> !!active
=> false

>> active = nil

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module ActiveSupport
  # Wrapping a string in this class gives you a prettier way to test
  # for equality. The value returned by <tt>Rails.env</tt> is wrapped
  # in a StringInquirer object so instead of calling this:
  #
  #   Rails.env == "production"
  #
  # you can call this:
  #
  #   Rails.env.production?

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# sweet!
>> m.food = "hi"
=> "hi"
>> m.food.hi?
=> true
>> m.food.apple?
=> false
>> m.food = "apple"
=> "apple"
>> m.food.apple?