You read that right! The famous Ruby Facets library finally supports RubyMotion. That means you can now use popular methods like String#underscore and String#camelcase from inside RubyMotion iOS applications. This change was done in the facets-glimmer fork of the project, so you would have to install the facets-glimmer Ruby gem to get it.
All Core and Standard Ruby Facets APIs are loaded automatically when including the facets-glimmer gem in a RubyMotion application, except a few files that are not compatible with RubyMotion, which are listed in the RubyMotion compatibility section on the GitHub Project page.
GitHub Project: https://github.com/AndyObtiva/facets-glimmer
Ruby Gem: https://rubygems.org/gems/facets-glimmer
Cheers!