kotlin.requireNotNull
requireNotNull
inline fun <T : Any> requireNotNull(value: T?): T
Throws an IllegalArgumentException if the value is null. Otherwise returns the not null value.
inline fun <T : Any> requireNotNull( value: T?, lazyMessage: () -> Any ): T
Throws an IllegalArgumentException with the result of calling lazyMessage if the value is null. Otherwise returns the not null value.
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
}
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Licensed under the Apache License, Version 2.0.
https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/require-not-null.html