Copy the Hello World example into the editor. This will be automatically synced to the environment.

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

Compile

kotlinc app.kt -include-runtime -d hello.jar

Run

java -jar hello.jar

Interested in writing your own Kotlin scenarios and demos? Visit www.katacoda.com/teach

i	In Command Mode	Change into Insert Mode, you can now insert and edit text in the file
esc	In Insert Mode	Change into Command Mode, you can now execute commands
:wq	In Command Mode	Save and Exit