How to get a random number in Kotlin?

Question

How can I get a random number between two values? Like ruby does with rand(0..n)

Answer 1

There are some ways to solve this problem:

A normal method:

The first and most intuitive is to create a function that returns a random number using the class java.util.Random:

import java.util.Random

val random = Random()

fun rand(from: Int, to: Int) : Int {
    return random.nextInt(to - from) + from // from(incluso) e to(excluso)
}

Extensive functions:

Another more interesting way is to use extensive functions:

fun ClosedRange<Int>.random() = 
     Random().nextInt(endInclusive - start) +  start

Soon after you can use as follows:

(0..10).random() // => retorná um númeor entre 0 e 9 (incluso)

Source: https://stackoverflow.com/questions/45685026/how-can-i-get-a-random-number-in-kotlin