Google’s Flutter = React and Java Swing
Dart? Sorry I'll have to pass. On top of Elixir, Go, and JS fatigue, I don't think I have any more room left for another language to "try".But if it was Polymer with native iOS/Android support, now then this would've been a different story! When I compare all the recent front-end frameworks, Polymer still is the most appealing to me, I wish it had a bit more steam behind it.