Package-level declarations

Sequence type that represents lazily evaluated collections. Top-level functions for instantiating sequences and extension functions for sequences.

Classification of sequences

The sequence operations can be classified into the following groups regarding their state requirements:

If the sequence operation returns another sequence, which is produced lazily, it's called intermediate, and otherwise the operation is terminal. Examples of terminal operations are kotlin.sequences.Sequence.toList, kotlin.sequences.Sequence.max.

Sequences can be iterated multiple times, however some sequence implementations might constrain themselves to be iterated only once. That is mentioned specifically in their documentation (e.g. kotlin.sequences.generateSequence overload). The latter sequences throw an exception on an attempt to iterate them the second time.

Types

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interface Sequence<out T>

A sequence that returns values through its iterator. The values are evaluated lazily, and the sequence is potentially infinite.

Since Kotlin 1.0
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Since Kotlin 1.0

Functions

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inline fun <T> Sequence<T>.all(predicate: (T) -> Boolean): Boolean

Returns true if all elements match the given predicate.

Since Kotlin 1.0
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fun <T> Sequence<T>.any(): Boolean

Returns true if sequence has at least one element.

Since Kotlin 1.0
inline fun <T> Sequence<T>.any(predicate: (T) -> Boolean): Boolean

Returns true if at least one element matches the given predicate.

Since Kotlin 1.0
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Creates an Iterable instance that wraps the original sequence returning its elements when being iterated.

Since Kotlin 1.0
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inline fun <T> Enumeration<T>.asSequence(): Sequence<T>

Creates a sequence that returns all values from this enumeration. The sequence is constrained to be iterated only once.

Since Kotlin 1.0

Creates a sequence that returns all elements from this iterator. The sequence is constrained to be iterated only once.

Since Kotlin 1.0
inline fun <T> Sequence<T>.asSequence(): Sequence<T>

Returns this sequence as a Sequence.

Since Kotlin 1.0
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inline fun <T, K, V> Sequence<T>.associate(transform: (T) -> Pair<K, V>): Map<K, V>

Returns a Map containing key-value pairs provided by transform function applied to elements of the given sequence.

Since Kotlin 1.0
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inline fun <T, K> Sequence<T>.associateBy(keySelector: (T) -> K): Map<K, T>

Returns a Map containing the elements from the given sequence indexed by the key returned from keySelector function applied to each element.

Since Kotlin 1.0
inline fun <T, K, V> Sequence<T>.associateBy(keySelector: (T) -> K, valueTransform: (T) -> V): Map<K, V>

Returns a Map containing the values provided by valueTransform and indexed by keySelector functions applied to elements of the given sequence.

Since Kotlin 1.0
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inline fun <T, K, M : MutableMap<in K, in T>> Sequence<T>.associateByTo(destination: M, keySelector: (T) -> K): M

Populates and returns the destination mutable map with key-value pairs, where key is provided by the keySelector function applied to each element of the given sequence and value is the element itself.

Since Kotlin 1.0
inline fun <T, K, V, M : MutableMap<in K, in V>> Sequence<T>.associateByTo(destination: M, keySelector: (T) -> K, valueTransform: (T) -> V): M

Populates and returns the destination mutable map with key-value pairs, where key is provided by the keySelector function and and value is provided by the valueTransform function applied to elements of the given sequence.

Since Kotlin 1.0
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inline fun <T, K, V, M : MutableMap<in K, in V>> Sequence<T>.associateTo(destination: M, transform: (T) -> Pair<K, V>): M

Populates and returns the destination mutable map with key-value pairs provided by transform function applied to each element of the given sequence.

Since Kotlin 1.0
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@JvmName(name = "averageOfByte")
fun Sequence<Byte>.average(): Double
@JvmName(name = "averageOfDouble")
fun Sequence<Double>.average(): Double
@JvmName(name = "averageOfFloat")
fun Sequence<Float>.average(): Double
@JvmName(name = "averageOfInt")
fun Sequence<Int>.average(): Double
@JvmName(name = "averageOfLong")
fun Sequence<Long>.average(): Double
@JvmName(name = "averageOfShort")
fun Sequence<Short>.average(): Double

Returns an average value of elements in the sequence.

Since Kotlin 1.0
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Returns a wrapper sequence that provides values of this sequence, but ensures it can be iterated only one time.

Since Kotlin 1.0
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operator fun <T> Sequence<T>.contains(element: T): Boolean

Returns true if element is found in the sequence.

Since Kotlin 1.0
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fun <T> Sequence<T>.count(): Int

Returns the number of elements in this sequence.

Since Kotlin 1.0
inline fun <T> Sequence<T>.count(predicate: (T) -> Boolean): Int

Returns the number of elements matching the given predicate.

Since Kotlin 1.0
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Returns a sequence containing only distinct elements from the given sequence.

Since Kotlin 1.0
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fun <T, K> Sequence<T>.distinctBy(selector: (T) -> K): Sequence<T>

Returns a sequence containing only elements from the given sequence having distinct keys returned by the given selector function.

Since Kotlin 1.0
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fun <T> Sequence<T>.drop(n: Int): Sequence<T>

Returns a sequence containing all elements except first n elements.

Since Kotlin 1.0
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fun <T> Sequence<T>.dropWhile(predicate: (T) -> Boolean): Sequence<T>

Returns a sequence containing all elements except first elements that satisfy the given predicate.

Since Kotlin 1.0
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fun <T> Sequence<T>.elementAt(index: Int): T

Returns an element at the given index or throws an IndexOutOfBoundsException if the index is out of bounds of this sequence.

Since Kotlin 1.0
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fun <T> Sequence<T>.elementAtOrElse(index: Int, defaultValue: (Int) -> T): T

Returns an element at the given index or the result of calling the defaultValue function if the index is out of bounds of this sequence.

Since Kotlin 1.0
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fun <T> Sequence<T>.elementAtOrNull(index: Int): T?

Returns an element at the given index or null if the index is out of bounds of this sequence.

Since Kotlin 1.0
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Returns an empty sequence.

Since Kotlin 1.0
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fun <T> Sequence<T>.filter(predicate: (T) -> Boolean): Sequence<T>

Returns a sequence containing only elements matching the given predicate.

Since Kotlin 1.0
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fun <T> Sequence<T>.filterIndexed(predicate: (index: Int, T) -> Boolean): Sequence<T>

Returns a sequence containing only elements matching the given predicate.

Since Kotlin 1.0
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inline fun <T, C : MutableCollection<in T>> Sequence<T>.filterIndexedTo(destination: C, predicate: (index: Int, T) -> Boolean): C

Appends all elements matching the given predicate to the given destination.

Since Kotlin 1.0
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inline fun <R> Sequence<*>.filterIsInstance(): Sequence<R>

Returns a sequence containing all elements that are instances of specified type parameter R.

Since Kotlin 1.0

Returns a sequence containing all elements that are instances of specified class.

Since Kotlin 1.0
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inline fun <R, C : MutableCollection<in R>> Sequence<*>.filterIsInstanceTo(destination: C): C

Appends all elements that are instances of specified type parameter R to the given destination.

Since Kotlin 1.0
fun <C : MutableCollection<in R>, R> Sequence<*>.filterIsInstanceTo(destination: C, klass: Class<R>): C

Appends all elements that are instances of specified class to the given destination.

Since Kotlin 1.0
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fun <T> Sequence<T>.filterNot(predicate: (T) -> Boolean): Sequence<T>

Returns a sequence containing all elements not matching the given predicate.

Since Kotlin 1.0
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Returns a sequence containing all elements that are not null.

Since Kotlin 1.0
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fun <C : MutableCollection<in T>, T : Any> Sequence<T?>.filterNotNullTo(destination: C): C

Appends all elements that are not null to the given destination.

Since Kotlin 1.0
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inline fun <T, C : MutableCollection<in T>> Sequence<T>.filterNotTo(destination: C, predicate: (T) -> Boolean): C

Appends all elements not matching the given predicate to the given destination.

Since Kotlin 1.0
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inline fun <T, C : MutableCollection<in T>> Sequence<T>.filterTo(destination: C, predicate: (T) -> Boolean): C

Appends all elements matching the given predicate to the given destination.

Since Kotlin 1.0
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inline fun <T> Sequence<T>.find(predicate: (T) -> Boolean): T?

Returns the first element matching the given predicate, or null if no such element was found.

Since Kotlin 1.0
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inline fun <T> Sequence<T>.findLast(predicate: (T) -> Boolean): T?

Returns the last element matching the given predicate, or null if no such element was found.

Since Kotlin 1.0
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fun <T> Sequence<T>.first(): T

Returns first element.

Since Kotlin 1.0
inline fun <T> Sequence<T>.first(predicate: (T) -> Boolean): T

Returns the first element matching the given predicate.

Since Kotlin 1.0
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fun <T> Sequence<T>.firstOrNull(): T?

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

Since Kotlin 1.0
inline fun <T> Sequence<T>.firstOrNull(predicate: (T) -> Boolean): T?

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

Since Kotlin 1.0
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fun <T, R> Sequence<T>.flatMap(transform: (T) -> Sequence<R>): Sequence<R>

Returns a single sequence of all elements from results of transform function being invoked on each element of original sequence.

Since Kotlin 1.0
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inline fun <T, R, C : MutableCollection<in R>> Sequence<T>.flatMapTo(destination: C, transform: (T) -> Sequence<R>): C

Appends all elements yielded from results of transform function being invoked on each element of original sequence, to the given destination.

Since Kotlin 1.0
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@JvmName(name = "flattenSequenceOfIterable")
fun <T> Sequence<Iterable<T>>.flatten(): Sequence<T>

Returns a sequence of all elements from all iterables in this sequence.

Since Kotlin 1.0

Returns a sequence of all elements from all sequences in this sequence.

Since Kotlin 1.0
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inline fun <T, R> Sequence<T>.fold(initial: R, operation: (acc: R, T) -> R): R

Accumulates value starting with initial value and applying operation from left to right to current accumulator value and each element.

Since Kotlin 1.0
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inline fun <T, R> Sequence<T>.foldIndexed(initial: R, operation: (index: Int, acc: R, T) -> R): R

Accumulates value starting with initial value and applying operation from left to right to current accumulator value and each element with its index in the original sequence.

Since Kotlin 1.0
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inline fun <T> Sequence<T>.forEach(action: (T) -> Unit)

Performs the given action on each element.

Since Kotlin 1.0
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inline fun <T> Sequence<T>.forEachIndexed(action: (index: Int, T) -> Unit)

Performs the given action on each element, providing sequential index with the element.

Since Kotlin 1.0
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fun <T : Any> generateSequence(nextFunction: () -> T?): Sequence<T>

Returns a sequence which invokes the function to calculate the next value on each iteration until the function returns null.

Since Kotlin 1.0
fun <T : Any> generateSequence(seed: T?, nextFunction: (T) -> T?): Sequence<T>

Returns a sequence defined by the starting value seed and the function nextFunction, which is invoked to calculate the next value based on the previous one on each iteration.

Since Kotlin 1.0
fun <T : Any> generateSequence(seedFunction: () -> T?, nextFunction: (T) -> T?): Sequence<T>

Returns a sequence defined by the function seedFunction, which is invoked to produce the starting value, and the nextFunction, which is invoked to calculate the next value based on the previous one on each iteration.

Since Kotlin 1.0
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inline fun <T, K> Sequence<T>.groupBy(keySelector: (T) -> K): Map<K, List<T>>

Groups elements of the original sequence by the key returned by the given keySelector function applied to each element and returns a map where each group key is associated with a list of corresponding elements.

Since Kotlin 1.0
inline fun <T, K, V> Sequence<T>.groupBy(keySelector: (T) -> K, valueTransform: (T) -> V): Map<K, List<V>>

Groups values returned by the valueTransform function applied to each element of the original sequence by the key returned by the given keySelector function applied to the element and returns a map where each group key is associated with a list of corresponding values.

Since Kotlin 1.0
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inline fun <T, K, M : MutableMap<in K, MutableList<T>>> Sequence<T>.groupByTo(destination: M, keySelector: (T) -> K): M

Groups elements of the original sequence by the key returned by the given keySelector function applied to each element and puts to the destination map each group key associated with a list of corresponding elements.

Since Kotlin 1.0
inline fun <T, K, V, M : MutableMap<in K, MutableList<V>>> Sequence<T>.groupByTo(destination: M, keySelector: (T) -> K, valueTransform: (T) -> V): M

Groups values returned by the valueTransform function applied to each element of the original sequence by the key returned by the given keySelector function applied to the element and puts to the destination map each group key associated with a list of corresponding values.

Since Kotlin 1.0
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fun <T> Sequence<T>.indexOf(element: T): Int

Returns first index of element, or -1 if the sequence does not contain element.

Since Kotlin 1.0
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inline fun <T> Sequence<T>.indexOfFirst(predicate: (T) -> Boolean): Int

Returns index of the first element matching the given predicate, or -1 if the sequence does not contain such element.

Since Kotlin 1.0
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inline fun <T> Sequence<T>.indexOfLast(predicate: (T) -> Boolean): Int

Returns index of the last element matching the given predicate, or -1 if the sequence does not contain such element.

Since Kotlin 1.0
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fun <T, A : Appendable> Sequence<T>.joinTo(buffer: A, separator: CharSequence = ", ", prefix: CharSequence = "", postfix: CharSequence = "", limit: Int = -1, truncated: CharSequence = "...", transform: (T) -> CharSequence? = null): A

Appends the string from all the elements separated using separator and using the given prefix and postfix if supplied.

Since Kotlin 1.0
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fun <T> Sequence<T>.joinToString(separator: CharSequence = ", ", prefix: CharSequence = "", postfix: CharSequence = "", limit: Int = -1, truncated: CharSequence = "...", transform: (T) -> CharSequence? = null): String

Creates a string from all the elements separated using separator and using the given prefix and postfix if supplied.

Since Kotlin 1.0
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fun <T> Sequence<T>.last(): T

Returns the last element.

Since Kotlin 1.0
inline fun <T> Sequence<T>.last(predicate: (T) -> Boolean): T

Returns the last element matching the given predicate.

Since Kotlin 1.0
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fun <T> Sequence<T>.lastIndexOf(element: T): Int

Returns last index of element, or -1 if the sequence does not contain element.

Since Kotlin 1.0
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fun <T> Sequence<T>.lastOrNull(): T?

Returns the last element, or null if the sequence is empty.

Since Kotlin 1.0
inline fun <T> Sequence<T>.lastOrNull(predicate: (T) -> Boolean): T?

Returns the last element matching the given predicate, or null if no such element was found.

Since Kotlin 1.0
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fun <T, R> Sequence<T>.map(transform: (T) -> R): Sequence<R>

Returns a sequence containing the results of applying the given transform function to each element in the original sequence.

Since Kotlin 1.0
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fun <T, R> Sequence<T>.mapIndexed(transform: (index: Int, T) -> R): Sequence<R>

Returns a sequence containing the results of applying the given transform function to each element and its index in the original sequence.

Since Kotlin 1.0
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fun <T, R : Any> Sequence<T>.mapIndexedNotNull(transform: (index: Int, T) -> R?): Sequence<R>

Returns a sequence containing only the non-null results of applying the given transform function to each element and its index in the original sequence.

Since Kotlin 1.0
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inline fun <T, R : Any, C : MutableCollection<in R>> Sequence<T>.mapIndexedNotNullTo(destination: C, transform: (index: Int, T) -> R?): C

Applies the given transform function to each element and its index in the original sequence and appends only the non-null results to the given destination.

Since Kotlin 1.0
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inline fun <T, R, C : MutableCollection<in R>> Sequence<T>.mapIndexedTo(destination: C, transform: (index: Int, T) -> R): C

Applies the given transform function to each element and its index in the original sequence and appends the results to the given destination.

Since Kotlin 1.0
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fun <T, R : Any> Sequence<T>.mapNotNull(transform: (T) -> R?): Sequence<R>

Returns a sequence containing only the non-null results of applying the given transform function to each element in the original sequence.

Since Kotlin 1.0
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inline fun <T, R : Any, C : MutableCollection<in R>> Sequence<T>.mapNotNullTo(destination: C, transform: (T) -> R?): C

Applies the given transform function to each element in the original sequence and appends only the non-null results to the given destination.

Since Kotlin 1.0
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inline fun <T, R, C : MutableCollection<in R>> Sequence<T>.mapTo(destination: C, transform: (T) -> R): C

Applies the given transform function to each element of the original sequence and appends the results to the given destination.

Since Kotlin 1.0
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fun <T : Comparable<T>> Sequence<T>.max(): T?
Since Kotlin 1.0
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inline fun <T, R : Comparable<R>> Sequence<T>.maxBy(selector: (T) -> R): T?
Since Kotlin 1.0
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fun <T> Sequence<T>.maxWith(comparator: Comparator<in T>): T?
Since Kotlin 1.0
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fun <T : Comparable<T>> Sequence<T>.min(): T?
Since Kotlin 1.0
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inline fun <T, R : Comparable<R>> Sequence<T>.minBy(selector: (T) -> R): T?
Since Kotlin 1.0
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operator fun <T> Sequence<T>.minus(element: T): Sequence<T>

Returns a sequence containing all elements of the original sequence without the first occurrence of the given element.

Since Kotlin 1.0
operator fun <T> Sequence<T>.minus(elements: Array<out T>): Sequence<T>

Returns a sequence containing all elements of original sequence except the elements contained in the given elements array.

Since Kotlin 1.0
operator fun <T> Sequence<T>.minus(elements: Iterable<T>): Sequence<T>

Returns a sequence containing all elements of original sequence except the elements contained in the given elements collection.

Since Kotlin 1.0
operator fun <T> Sequence<T>.minus(elements: Sequence<T>): Sequence<T>

Returns a sequence containing all elements of original sequence except the elements contained in the given elements sequence.

Since Kotlin 1.0
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inline fun <T> Sequence<T>.minusElement(element: T): Sequence<T>

Returns a sequence containing all elements of the original sequence without the first occurrence of the given element.

Since Kotlin 1.0
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fun <T> Sequence<T>.minWith(comparator: Comparator<in T>): T?
Since Kotlin 1.0
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fun <T> Sequence<T>.none(): Boolean

Returns true if the sequence has no elements.

Since Kotlin 1.0
inline fun <T> Sequence<T>.none(predicate: (T) -> Boolean): Boolean

Returns true if no elements match the given predicate.

Since Kotlin 1.0
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inline fun <T> Sequence<T>.partition(predicate: (T) -> Boolean): Pair<List<T>, List<T>>

Splits the original sequence into pair of lists, where first list contains elements for which predicate yielded true, while second list contains elements for which predicate yielded false.

Since Kotlin 1.0
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operator fun <T> Sequence<T>.plus(element: T): Sequence<T>

Returns a sequence containing all elements of the original sequence and then the given element.

Since Kotlin 1.0
operator fun <T> Sequence<T>.plus(elements: Array<out T>): Sequence<T>

Returns a sequence containing all elements of original sequence and then all elements of the given elements array.

Since Kotlin 1.0
operator fun <T> Sequence<T>.plus(elements: Iterable<T>): Sequence<T>

Returns a sequence containing all elements of original sequence and then all elements of the given elements collection.

Since Kotlin 1.0
operator fun <T> Sequence<T>.plus(elements: Sequence<T>): Sequence<T>

Returns a sequence containing all elements of original sequence and then all elements of the given elements sequence.

Since Kotlin 1.0
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inline fun <T> Sequence<T>.plusElement(element: T): Sequence<T>

Returns a sequence containing all elements of the original sequence and then the given element.

Since Kotlin 1.0
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inline fun <S, T : S> Sequence<T>.reduce(operation: (acc: S, T) -> S): S

Accumulates value starting with the first element and applying operation from left to right to current accumulator value and each element.

Since Kotlin 1.0
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inline fun <S, T : S> Sequence<T>.reduceIndexed(operation: (index: Int, acc: S, T) -> S): S

Accumulates value starting with the first element and applying operation from left to right to current accumulator value and each element with its index in the original sequence.

Since Kotlin 1.0
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Returns an original collection containing all the non-null elements, throwing an IllegalArgumentException if there are any null elements.

Since Kotlin 1.0
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inline fun <T> Sequence(crossinline iterator: () -> Iterator<T>): Sequence<T>

Given an iterator function constructs a Sequence that returns values through the Iterator provided by that function. The values are evaluated lazily, and the sequence is potentially infinite.

Since Kotlin 1.0
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fun <T> sequenceOf(vararg elements: T): Sequence<T>

Creates a sequence that returns the specified values.

Since Kotlin 1.0
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fun <T> Sequence<T>.single(): T

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

Since Kotlin 1.0
inline fun <T> Sequence<T>.single(predicate: (T) -> Boolean): T

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
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Returns single element, or null if the sequence is empty or has more than one element.

Since Kotlin 1.0
inline fun <T> Sequence<T>.singleOrNull(predicate: (T) -> Boolean): T?

Returns the single element matching the given predicate, or null if element was not found or more than one element was found.

Since Kotlin 1.0
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Returns a sequence that yields elements of this sequence sorted according to their natural sort order.

Since Kotlin 1.0
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inline fun <T, R : Comparable<R>> Sequence<T>.sortedBy(crossinline selector: (T) -> R?): Sequence<T>

Returns a sequence that yields elements of this sequence sorted according to natural sort order of the value returned by specified selector function.

Since Kotlin 1.0
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inline fun <T, R : Comparable<R>> Sequence<T>.sortedByDescending(crossinline selector: (T) -> R?): Sequence<T>

Returns a sequence that yields elements of this sequence sorted descending according to natural sort order of the value returned by specified selector function.

Since Kotlin 1.0
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Returns a sequence that yields elements of this sequence sorted descending according to their natural sort order.

Since Kotlin 1.0
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fun <T> Sequence<T>.sortedWith(comparator: Comparator<in T>): Sequence<T>

Returns a sequence that yields elements of this sequence sorted according to the specified comparator.

Since Kotlin 1.0
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@JvmName(name = "sumOfByte")
fun Sequence<Byte>.sum(): Int
@JvmName(name = "sumOfDouble")
fun Sequence<Double>.sum(): Double
@JvmName(name = "sumOfFloat")
fun Sequence<Float>.sum(): Float
@JvmName(name = "sumOfInt")
fun Sequence<Int>.sum(): Int
@JvmName(name = "sumOfLong")
fun Sequence<Long>.sum(): Long
@JvmName(name = "sumOfShort")
fun Sequence<Short>.sum(): Int

Returns the sum of all elements in the sequence.

Since Kotlin 1.0
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inline fun <T> Sequence<T>.sumBy(selector: (T) -> Int): Int

Returns the sum of all values produced by selector function applied to each element in the sequence.

Since Kotlin 1.0
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inline fun <T> Sequence<T>.sumByDouble(selector: (T) -> Double): Double

Returns the sum of all values produced by selector function applied to each element in the sequence.

Since Kotlin 1.0
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fun <T> Sequence<T>.take(n: Int): Sequence<T>

Returns a sequence containing first n elements.

Since Kotlin 1.0
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fun <T> Sequence<T>.takeWhile(predicate: (T) -> Boolean): Sequence<T>

Returns a sequence containing first elements satisfying the given predicate.

Since Kotlin 1.0
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fun <T, C : MutableCollection<in T>> Sequence<T>.toCollection(destination: C): C

Appends all elements to the given destination collection.

Since Kotlin 1.0
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Returns a new HashSet of all elements.

Since Kotlin 1.0
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fun <T> Sequence<T>.toList(): List<T>

Returns a List containing all elements.

Since Kotlin 1.0
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Returns a new MutableList filled with all elements of this sequence.

Since Kotlin 1.0
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Returns a new MutableSet containing all distinct elements from the given sequence.

Since Kotlin 1.0
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fun <T> Sequence<T>.toSet(): Set<T>

Returns a Set of all elements.

Since Kotlin 1.0
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fun <T> Sequence<T>.toSortedSet(comparator: Comparator<in T>): SortedSet<T>

Returns a new SortedSet of all elements.

Since Kotlin 1.0
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fun <T, R> Sequence<Pair<T, R>>.unzip(): Pair<List<T>, List<R>>

Returns a pair of lists, where first list is built from the first values of each pair from this sequence, second list is built from the second values of each pair from this sequence.

Since Kotlin 1.0
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Returns a sequence that wraps each element of the original sequence into an IndexedValue containing the index of that element and the element itself.

Since Kotlin 1.0
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infix fun <T, R> Sequence<T>.zip(other: Sequence<R>): Sequence<Pair<T, R>>

Returns a sequence of values built from the elements of this sequence and the other sequence with the same index. The resulting sequence ends as soon as the shortest input sequence ends.

Since Kotlin 1.0
fun <T, R, V> Sequence<T>.zip(other: Sequence<R>, transform: (a: T, b: R) -> V): Sequence<V>

Returns a sequence of values built from the elements of this sequence and the other sequence with the same index using the provided transform function applied to each pair of elements. The resulting sequence ends as soon as the shortest input sequence ends.

Since Kotlin 1.0