multi-dimensional array map

object

class Object
 def deep_map(&block); yield(self) end
end

class Array
  def deep_map(&block); map{|e| e.deep_map(&block)} end
end

or

class Object
  def deep_map &block
    if self.respond_to?(:inject)
     self.inject([]) do |result, ary|
        result << ary.deep_map(&block)
      end
    else
      block.call(self)
    end
  end
end