tree a51ef81481f67d025842957ec2c68b3bca9b9481
parent 06044604bfed730f91fc75758c2aae6ff7e33272
author Haoming Zhang <haoming@haoming-macbookpro.roam.corp.google.com> 1490906752 -0700
committer Haoming Zhang <haoming@haoming-macbookpro.roam.corp.google.com> 1490906752 -0700

refactor code according to comments