kotlin-stdlib/kotlin.collections/firstOrNull

firstOrNull

fun <T> Array<out T>.firstOrNull(): T?

fun ByteArray.firstOrNull(): Byte?

fun ShortArray.firstOrNull(): Short?

fun IntArray.firstOrNull(): Int?

fun LongArray.firstOrNull(): Long?

fun FloatArray.firstOrNull(): Float?

fun DoubleArray.firstOrNull(): Double?

fun BooleanArray.firstOrNull(): Boolean?

fun CharArray.firstOrNull(): Char?

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

inline fun <T> Array<out T>.firstOrNull(predicate: (T) -> Boolean): T?

inline fun ByteArray.firstOrNull(predicate: (Byte) -> Boolean): Byte?

inline fun ShortArray.firstOrNull(predicate: (Short) -> Boolean): Short?

inline fun IntArray.firstOrNull(predicate: (Int) -> Boolean): Int?

inline fun LongArray.firstOrNull(predicate: (Long) -> Boolean): Long?

inline fun FloatArray.firstOrNull(predicate: (Float) -> Boolean): Float?

inline fun DoubleArray.firstOrNull(predicate: (Double) -> Boolean): Double?

inline fun BooleanArray.firstOrNull(predicate: (Boolean) -> Boolean): Boolean?

inline fun CharArray.firstOrNull(predicate: (Char) -> Boolean): Char?

inline fun <T> Iterable<T>.firstOrNull(predicate: (T) -> Boolean): T?

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

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

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

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

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

@ExperimentalUnsignedTypes

fun UIntArray.firstOrNull(): UInt?

@ExperimentalUnsignedTypes

fun ULongArray.firstOrNull(): ULong?

@ExperimentalUnsignedTypes

fun UByteArray.firstOrNull(): UByte?

@ExperimentalUnsignedTypes

fun UShortArray.firstOrNull(): UShort?

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

Since Kotlin

1.3

@ExperimentalUnsignedTypes

inline fun UIntArray.firstOrNull(predicate: (UInt) -> Boolean): UInt?

@ExperimentalUnsignedTypes

inline fun ULongArray.firstOrNull(predicate: (ULong) -> Boolean): ULong?

@ExperimentalUnsignedTypes

inline fun UByteArray.firstOrNull(predicate: (UByte) -> Boolean): UByte?

@ExperimentalUnsignedTypes

inline fun UShortArray.firstOrNull(predicate: (UShort) -> Boolean): UShort?

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

Since Kotlin

1.3