> You can't really/easily use a scala library from MRI You can easily link Scala with Ruby by running both on the JVM. Assuming you really want MRI, on the cli

> You can't really/easily use a scala library from MRI You can easily link Scala with Ruby by running both on the JVM. Assuming you really want MRI, on the client-side that implies running 2 processes with their own runtime at least, instead of just one process. There is a reason for why I've heard of Ruby developers choosing JRuby to deploy Ruby apps, because having only one GC for managing a long-running process is expensive enough, having more than one gets awful fast. On the server-side on the other hand, you have the freedom of deploying your stuff on multiple servers, which is often the case so you can use a micro-services approach - in our current project the front-end is developed in Ruby / Javascript and the backend in Scala, linked through a web service API. The great thing about this, besides using the best tool for the job and so on, is that people can work on them in parallel. IMHO, I think the reusability of C is overstated. I haven't used C libraries in any of the JVM apps I ever developed and this reduced the headaches I've had back in the days when I did stuff with CPython or Ruby MRI. And given a potent runtime, you can make both Python and Ruby run on top of it with reasonable performance (compared to their reference implementations).