tree 5616babb7969208f2a122c9ef2f43d6f8b16e65b
parent 929a72d67c5fb1030a58260590d47320a0b2dbd8
author Roman Kamyk <rkj@google.com> 1567617260 -0700
committer Adam Cozzette <acozzette@google.com> 1567625457 -0700

Fix small style issues in the dart example, following Effective Dart:

- use final instead of obvious types for local variables
- add missing `void` return type
- make the comments doccomments (///)