node version > 4.0
Strictly follow airbnb javascript style(ES2015, JS6) https://github.com/airbnb/javascript
In my opinion, you 'd better write all codes with the latest standard.
Some notice,
- Make sure you have delete all console.log when you run learnyounode verify, since it will disturb nodeschool to judge your program when contains other console.log...
- Suggest to using native code better than third-party packages.