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Comment by Zarel | Hacker News Reader

Nitpick, the Hello World comparison is more like:

Swift

    print("Hello, world!")

Kotlin

    fun main(args: Array<String>) {
        println("Hello, world!")
    }

Kotlin has a REPL

You've missed the point. He is saying that to get a hello world going in Kotlin you don't need to write a func if you are in the context of the REPL.

We also support kotlin as of yesterday https://repl.it/site/blog/kotlin