I would strongly advise against using Ruby. It's slow, documentation is not world-class, a lot of the libraries (Rails especially) use metaprogramming magic that is hard to understand and debug. Ruby project have a lot of maintenance problems. Ruby's popularity has been on steady decline for years.
In my opinion, Python is far superior to Ruby in terms of implementation and documentation (as a bonus, you can extend your expertise beyond web development very easily).
Also, as of 2019, Node.js has matured well and is a very capable development platform, especially if you use Typescript. The demand for developers is quite high.
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I would strongly advise against using Ruby. It's slow, documentation is not world-class, a lot of the libraries (Rails especially) use metaprogramming magic that is hard to understand and debug. Ruby project have a lot of maintenance problems. Ruby's popularity has been on steady decline for years.
In my opinion, Python is far superior to Ruby in terms of implementation and documentation (as a bonus, you can extend your expertise beyond web development very easily).
Also, as of 2019, Node.js has matured well and is a very capable development platform, especially if you use Typescript. The demand for developers is quite high.