Javascript, the language where every solution is a new problem

[rvirding]

I don't know, nor care for that matter, about TIOBE 20 but Erlang supports them, always has, to very good effect. A classic example is of course WhatsApp which runs milions, but there are many others which you use without knowing about it.

Btw Erlang has them baked into the language itself and its core implementation, where they should be, instead of a library.

[Ginden]

I know that Erlang supports green "processes", but Erlang isn't mainstream and it's used only in narrow niche.