I spent the last few months digging in a lot of different technologies during my spare time, just for curiosity, from Elixir to Kotlin, and abstractions, from Functional Reactive Programming to Event-driven Dataflow Programming also reading about the history behind them. After studying the latter, I actually decided to write a book about Reactive Programming in Swift, that is a work in progress, but that's another story.
I am a desperately curious developer and I was wondering which technology are you currently learning or are you planning to learn in the near future and why?
Learning how to apply clean architecture (ref: Robert C Martin) when using a large framework like rails/django. Learning ruby, rails, and django (already quite familiar with python. Been using flask for everything I do so far).
Building a real time application. Learning meteor and how to apply TDD with meteor.
Building a front end heavy single page application. Relearning HTML and CSS properly. Still deciding whether to use React or Ember. Ember's documentation is bad but I've already put up my hand to help improve it. I really want to help. But react is just looking really good and it's docs are stellar. To the point that I feel like I'd be missing a bus if I ignored learning it. Will probably toss a coin on that.