gistfile1.txt

  def seek_and_replace(array_of_keys, new_value)
    last_level    = self
    sought_value  = nil
 
    array_of_keys.each_with_index do |_key_, _idx_|
      if last_level.is_a?(Hash) && last_level.has_key?(_key_)
        if _idx_ + 1 == array_of_keys.count
          last_level[_key_] = new_value
        else                   
          last_level = last_level[_key_]
        end
      else 
        break
      end
    end
 
    self
  end