Scala require() equivalent in Kotlin

Question

In Scala we have a require method that is used to set preconditions to classes like this

class Rational(x: Int, y: Int) {
   require(y != 0, "denominator must be different than zero ")

My question is: Do we have something like that in Kotlin?

Answer 1

Kotlin stdlib also has a require method:

class Rational(x: Int, y: Int) {
    init {
        require(y != 0) { "denominator must be different than zero " }
    }
}

It also has a requireNotNull, check, checkNotNull, assert.

There are also various other assert methods in kotlin-test.

Answer 2

How about Preconditions.kt or Assert ?