kotlin.require
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-negative, was -1
//sampleEnd
}
inline fun require(value: Boolean, lazyMessage: () -> Any)
Throws an IllegalArgumentException with the result of calling lazyMessage 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-negative, was -1
//sampleEnd
}
© 2010–2017 JetBrains s.r.o.
Licensed under the Apache License, Version 2.0.
https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/require.html