Kotlin when

In the Welcome to Android Studio dialog, click Start a new Android Studio project.

The Unit type in Kotlin is the equivalent to the void type in Java . Or, if you prefer, is the result value of any statement (for example println() ).

This function is used to execute code. Any code inside the main() function’s curly brackets {} will be executed . For example, the println() function is inside the main() function, meaning that this will be executed. The println() function is used to output/print text, and in our example it will output “Hello World”.

Before you write the program, make sure your computer can run Kotlin.