Yes, also kotlin is pretty nice if you want to write oop/procedural code with some functional flavor. - Lot of inline methods in stdlib alleviate the performan

Yes, also kotlin is pretty nice if you want to write oop/procedural code with some functional flavor. - Lot of inline methods in stdlib alleviate the performance penalty of using higher order functions for tight loops. - It is nice to have everything as expression - Extension functions, it parameter, operator overloading, tuples are all micro-conveniences that coherently add up to a very pleasant experience. I think the author's experience would have been substantially different if they used ktor/http4k/vertx with kotlin.