As per the
jazz_hands repo https://github.com/nixme/jazz_hands
Spending hours in the rails console? Spruce it up and show off those hard-working hands!
jazz_hands is an opinionated set of console-related gems and a bit of glue
The debugger gem works for 1.8 and 1.9 Ruby. But not for > 2.0.
It is recommended to use byebug or debugger2 for Ruby > 2.0
If any one has problems with spring loading on Rails 4, then we recommend restarting spring