kotlin-stdlib/kotlin.collections/firstOrNull

firstOrNull

fun <T> Array<out T>.firstOrNull(): T?(source)
fun ByteArray.firstOrNull(): Byte?(source)
fun ShortArray.firstOrNull(): Short?(source)
fun IntArray.firstOrNull(): Int?(source)
fun LongArray.firstOrNull(): Long?(source)
fun FloatArray.firstOrNull(): Float?(source)
fun DoubleArray.firstOrNull(): Double?(source)
fun BooleanArray.firstOrNull(): Boolean?(source)
fun CharArray.firstOrNull(): Char?(source)

Returns the first element, or null if the array is empty.

Since Kotlin

1.0
inline fun <T> Array<out T>.firstOrNull(predicate: (T) -> Boolean): T?(source)
inline fun ByteArray.firstOrNull(predicate: (Byte) -> Boolean): Byte?(source)
inline fun ShortArray.firstOrNull(predicate: (Short) -> Boolean): Short?(source)
inline fun IntArray.firstOrNull(predicate: (Int) -> Boolean): Int?(source)
inline fun LongArray.firstOrNull(predicate: (Long) -> Boolean): Long?(source)
inline fun FloatArray.firstOrNull(predicate: (Float) -> Boolean): Float?(source)
inline fun DoubleArray.firstOrNull(predicate: (Double) -> Boolean): Double?(source)
inline fun BooleanArray.firstOrNull(predicate: (Boolean) -> Boolean): Boolean?(source)
inline fun CharArray.firstOrNull(predicate: (Char) -> Boolean): Char?(source)
inline fun <T> Iterable<T>.firstOrNull(predicate: (T) -> Boolean): T?(source)

Returns the first element matching the given predicate, or null if element was not found.

Since Kotlin

1.0
fun <T> Iterable<T>.firstOrNull(): T?(source)

Returns the first element, or null if the collection is empty.

Since Kotlin

1.0
fun <T> List<T>.firstOrNull(): T?(source)

Returns the first element, or null if the list is empty.

Since Kotlin

1.0
@ExperimentalUnsignedTypes
fun UIntArray.firstOrNull(): UInt?(source)
@ExperimentalUnsignedTypes
fun ULongArray.firstOrNull(): ULong?(source)
@ExperimentalUnsignedTypes
fun UByteArray.firstOrNull(): UByte?(source)
@ExperimentalUnsignedTypes
fun UShortArray.firstOrNull(): UShort?(source)

Returns the first element, or null if the array is empty.

Since Kotlin

1.3
@ExperimentalUnsignedTypes
inline fun UIntArray.firstOrNull(predicate: (UInt) -> Boolean): UInt?(source)
@ExperimentalUnsignedTypes
inline fun ULongArray.firstOrNull(predicate: (ULong) -> Boolean): ULong?(source)
@ExperimentalUnsignedTypes
inline fun UByteArray.firstOrNull(predicate: (UByte) -> Boolean): UByte?(source)
@ExperimentalUnsignedTypes
inline fun UShortArray.firstOrNull(predicate: (UShort) -> Boolean): UShort?(source)

Returns the first element matching the given predicate, or null if element was not found.

Since Kotlin

1.3