hash value by dotted string key

dotted_hash.rb

  # hash = {'a' => {'b' => {'c' => 1}}}
  # path = "a.b.c"
  # hash_value_by_dotted_notation(hash, path)
  # => 1
  # invalid path returns nil
  def hash_value_by_dotted_notation(hash, dotted_path)
    val = hash
    dotted_path.to_s.split(".").each do |k|
      val = (val.is_a?(Hash) && val.has_key?(k)) ? val[k] : nil
    end
    val == hash ? nil : val
  end