Merge Nicely

merge_nicely.rb

class Hash
  
  # Merges attributes nicely instead of just overwriting them.
  # 
  # { class: 'large' }.merge_nicely!( class: 'label' ) #=> { class: 'large label' }
  #
  def merge_nicely!( hash_to_add = {} )
    self.merge!(hash_to_add.to_hash) do |key, original_element, new_element|
      if original_element.is_a? String and new_element.is_a? String
        original_element + " " + new_element
      end
    end
  end
  
end