kotlin-stdlib/kotlin.collections/single

single

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

Returns the single element, or throws an exception if the array is empty or has more than one element.

Since Kotlin

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

Returns the single element matching the given predicate, or throws exception if there is no or more than one matching element.

Since Kotlin

1.0
fun <T> Iterable<T>.single(): T(source)

Returns the single element, or throws an exception if the collection is empty or has more than one element.

Since Kotlin

1.0
fun <T> List<T>.single(): T(source)

Returns the single element, or throws an exception if the list is empty or has more than one element.

Since Kotlin

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

Returns the single element, or throws an exception if the array is empty or has more than one element.

Since Kotlin

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

Returns the single element matching the given predicate, or throws exception if there is no or more than one matching element.

Since Kotlin

1.3