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.