Need to take a more careful look at this stuff.
I believe this is correct. Python is not likely growing in app development, but for data analysis and related backend tasks - in the same areas R is seeing a popularity boost.
Client-side Dart code, yes. But that's something you had to do for compatibility reasons anyways.
Also, don't forget that Dart also exists outside of browsers. It's a fast scripting language with excellent tooling. I use it for almost everything nowadays.
They are also working on a second JIT-free VM (Fletch) for iOS and similar locked-down environments. It's small, highly concurrent, pretty fast, and it supports atomic code updates via some wire protocol. So, Dart doesn't just compete with TypeScript on the browser side, it also completes with languages like Ruby, Python, and PHP on the server side and even with compact embedding-friendly languages like Lua.
Dart's future looks bright, but it's definitely a lot less browser-centric than initially anticipated.
Tried the same in NodeJS and that gave:
Object has no method 'bar'
It would have been nice to see some thoughtful analysis based on the deltas of the languages from those rankings over 2014. All of those rankings are biased in their own ways, hence all of them being wildly different, but I think looking at how languages change across them paints an interesting picture.
Also, sad to see Ruby usage go down. It's my day-to-day language. But then again, it's just a language/tool.
(Scroll down to "TOP ACTIVE LANGUAGES")