Absolutely, but not in dynamic languages. Elixir (well, and Erlang) and Ruby are the only non-lisp dynamic languages I'm aware of with the feature. It's not the

Absolutely, but not in dynamic languages. Elixir (well, and Erlang) and Ruby are the only non-lisp dynamic languages I'm aware of with the feature. It's not the only thing I like, but it's a major component of the "functionalish" features that I really like and mostly see attached to static functional languages. Rust is fairly mainstream, and I think a step in the right direction. Honestly I suspect that many people who like Rust actually just like a fast systems language with niceties like implicit return and iterators.