Kotlin
Kotlin
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kotlin.require

require

kotlin-stdlib / kotlin - require 
inline fun require(value: Boolean)

Throws an IllegalArgumentException if the value is false.

import kotlin.test.*

fun main(args: Array<String>) {
//sampleStart
fun getIndices(count: Int) {
    require(count >= 0) { "Count must be non-negative, was $count" }
    // ...
}

val exception = assertFailsWith<IllegalArgumentException> {
    getIndices(-1)
}
println(exception.message) // Count must be non