How can I get a random number in Kotlin?

Question

A generic method that can return a random integer between 2 parameters like ruby does with rand(0..n).

Any suggestion?

Answer 1

Possible Variation to my other answer for random chars

In order to get random Chars, you can define an extension function like this

fun ClosedRange.random(): Char = 
       (Random().nextInt(endInclusive.toInt() + 1 - start.toInt()) + start.toInt()).toChar()

// will return a `Char` between A and Z (incl.)
('A'..'Z').random()

If you're working with JDK > 1.6, use ThreadLocalRandom.current() instead of Random().

For kotlinjs and other use cases which don't allow the usage of java.util.Random, this answer will help.

Kotlin >= 1.3 multiplatform support for Random

As of 1.3, Kotlin comes with its own multiplatform Random generator. It is described in this KEEP. You can now directly use the extension as part of the Kotlin standard library without defining it:

('a'..'b').random()