kotlin-stdlib / kotlin.ranges / firstOrNull firstOrNull Common JVM JS Native 1.7 fun IntProgression.firstOrNull(): Int?(source) fun LongProgression.firstOrNull(): Long?(source) fun CharProgression.firstOrNull(): Char?(source) fun UIntProgression.firstOrNull(): UInt?(source) fun ULongProgression.firstOrNull(): ULong?(source) Returns the first element, or null if the progression is empty.