[freedomben]

> It made functional programming mainstream in front-end development.

I totally agree, and in fact I would take it a little farther and say it's making functional programming mainstream on the backend as well. Many people I've worked with got their taste via React/Redux and then started adopting things like Elixir/Phoenix for the backend.

Maybe it's an overstatement, but I credit React with driving at least some of that.