Snippet to translate a array of paths into a nested hash map

array_ex.rb

# ["home/folder1", "home/folder2", "home/folder1/folderA", "home/folder2/folderB"].as_paths_to_map 
# => {"home"=>{"folder1"=>{"folderA"=>{}}, "folder2"=>{"folderB"=>{}}}} 
class Array
  def as_paths_to_map
    auto_hash = Hash.new { |h,k| h[k] = Hash.new &h.default_proc }

    self.each do |path|
      sub = auto_hash
      path.split( "/" ).each do |dir| 
        next if dir.empty?
        sub = sub[dir]
      end
    end

    auto_hash
  end
end