Difficulty: Beginner
Estimated Time: 5 min

Kotlin Interactive Tutorial

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About the Author

Ken Kousen is a Java Champion, Oracle Developer Champion, and Grails Rock Star whose books include Modern Java Recipes, Gradle Recipes for Android, and Making Java Groovy.

Kotlin Cookbook

Step 1 of 2

Use the Kotlin REPL


You want to run Kotlin in an interactive shell as a quick and easy way to evaluate Kotlin expressions without starting up a full integrated development environment (IDE).


Use the Kotlin REPL by typing kotlinc at the command line.


Kotlin includes an interactive compiler session, known as a REPL (Read-Eval-Print-Loop) that is triggered by the kotlinc command with no arguments. Once inside the REPL, you can evaluate arbitrary Kotlin commands and see the results immediately.

TIP: The Kotlin REPL is also available inside Android Studio and IntelliJ IDEA as the Kotlin REPL entry under the Tools/Kotlin menu.

After running the kotlinc command, you will receive an interactive prompt.


Once you're logged in, try a command:

println("Hello, World!")

You can also do things like set variables:

var name = "Dolly"
println("Hello, $name!")

Finally, you can get help:


When you're done, use the



Oh -- I need this as the base image:

docker pull zenika/kotlin