[jsteemann]

Forgot to answer the JavaScript question... JavaScript can be used in ArangoDB to run something like stored procedures. ArangoDB comes with a JavaScript-based framework (named Foxx) for building data-centric micro services. Its usage is completely optional however. When using the framework, it will allow you to easily write custom REST APIs for certain database operations. The API description is consumable via Swagger too, so API documentation and discoverability are no-brainers.

Apart from that, ArangoDB comes with a JavaScript-enabled shell (arangosh) that can be used for scripting and automating database operations.