[volgar1x]

Kotlin really shines when it comes to async programming. This is some code I wrote using Vert.x with Kotlin extensions :

    router.get("/api/article/:id").coroutineHandler { ctx ->
        val news = newsRepository.get(ctx.pathParam("id")) // no need for await
             ?: return ctx.respondText(404, "Not Found") // can still use basic code constructs
        ctx.respondJson(200, jsonObjectOf("news" to news)) // actually an extension method i wrote
    }