Ranges in Kotlin

To create ranges of variables in Kotlin, you can use the rangeTo extension function or the .. operator of Kotlin. We can create a range of any Comparable type.

Let's look at the following example:

fun main(args: Array<String>) {
    val int = args[0].toInt()
    if (int in 0..10) {
        println(int)
    }
}

In this example, we retrieve a value from the args array.

To run a program with parameters in IntelliJ IDEA, click Run and choose Edit Configurations...:

In the window that opens, you can paste parameters in the Program arguments field:

Press OK and run the application. The output will be as follows:

2

Decompiled to Java, it looks like the following:

public static final void main(@NotNull String[] args) {
...