refactoring patterns

## Self Encapsulate Field (http://refactoring.com/catalog/selfEncapsulateField.html)

class Fieldz
  
  def initialize
    @low  = -1
    @high = 50
  end
  
  def includes(arg)
    arg >= @low && arg <= @high
  end
	
end

# Refactored

class Fieldz
  
  attr_reader :low, :high
  
  def initialize
    @low  = -1
    @high = 50
  end
  
  def includes(arg)
    arg >= low && arg <= high
  end
	
end