def getAddress(name: String): Option[String] = {
      for {
        elem <- database.get(name)
        nullableAddress <- elem.data.get("address")
        address <- Option(nullableAddress)
      } yield address
    }

    def getAddress(name: String): Option[String] = {
      for {
        elem <- database.get(name)
        address <- elem.data.get("address").flatMap(Option.apply)
      } yield address
    }

Also it seems like a bit of a strawman to use such a pathological example (null values stored in a map are frowned upon even in Java-land) to motivate the entire styleguide section about monadic chaining. They say it's contrived but still -.-