An asynchronous sequence, up to a specified maximum length, containing the initial elements of a base asynchronous sequence.
struct AsyncPrefixSequence<Base> where Base : AsyncSequenceimport _Concurrencyprotocol AsyncSequence<Element, Failure>A type that provides asynchronous, sequential, iterated access to its elements.
protocol CopyableA type whose values can be implicitly or explicitly copied.
protocol Escapablefunc makeAsyncIterator() -> AsyncPrefixSequence<Base>.Iterator struct IteratorThe iterator that produces elements of the prefix sequence.
typealias AsyncIterator = AsyncPrefixSequence<Base>.IteratorThe type of iterator that produces elements of the sequence.
typealias Element = Base.ElementThe type of element produced by this asynchronous sequence.
typealias Failure = Base.FailureThe type of the error that can be produced by the sequence.
func allSatisfy(_ predicate: (Self.Element) async throws -> Bool) async rethrows -> Bool Returns a Boolean value that indicates whether all elements produced by the asynchronous sequence satisfy the given predicate.
@preconcurrency func compactMap<ElementOfResult>(_ transform: @escaping (Self.Element) async -> ElementOfResult?) -> AsyncCompactMapSequence<Self, ElementOfResult> Creates an asynchronous sequence that maps the given closure over the asynchronous sequence’s elements, omitting results that don’t return a value.
@preconcurrency func compactMap<ElementOfResult>(_ transform: @escaping (Self.Element) async throws -> ElementOfResult?) -> AsyncThrowingCompactMapSequence<Self, ElementOfResult> Creates an asynchronous sequence that maps an error-throwing closure over the base sequence’s elements, omitting results that don’t return a value.
func contains(_ search: Self.Element) async rethrows -> Bool Returns a Boolean value that indicates whether the asynchronous sequence contains the given element.
func contains(where predicate: (Self.Element) async throws -> Bool) async rethrows -> Bool Returns a Boolean value that indicates whether the asynchronous sequence contains an element that satisfies the given predicate.
@preconcurrency func drop(while predicate: @escaping (Self.Element) async -> Bool) -> AsyncDropWhileSequence<Self> Omits elements from the base asynchronous sequence until a given closure returns false, after which it passes through all remaining elements.
func dropFirst(_ count: Int = 1) -> AsyncDropFirstSequence<Self> Omits a specified number of elements from the base asynchronous sequence, then passes through all remaining elements.
@preconcurrency func filter(_ isIncluded: @escaping (Self.Element) async -> Bool) -> AsyncFilterSequence<Self> Creates an asynchronous sequence that contains, in order, the elements of the base sequence that satisfy the given predicate.
func first(where predicate: (Self.Element) async throws -> Bool) async rethrows -> Self.Element? Returns the first element of the sequence that satisfies the given predicate.
@preconcurrency func flatMap<SegmentOfResult>(_ transform: @escaping (Self.Element) async throws -> SegmentOfResult) -> AsyncThrowingFlatMapSequence<Self, SegmentOfResult> where SegmentOfResult : AsyncSequence Creates an asynchronous sequence that concatenates the results of calling the given error-throwing transformation with each element of this sequence.
@preconcurrency func flatMap<SegmentOfResult>(_ transform: @escaping (Self.Element) async -> SegmentOfResult) -> AsyncFlatMapSequence<Self, SegmentOfResult> where SegmentOfResult : AsyncSequence, Self.Failure == SegmentOfResult.Failure Creates an asynchronous sequence that concatenates the results of calling the given transformation with each element of this sequence.
@preconcurrency func flatMap<SegmentOfResult>(_ transform: @escaping (Self.Element) async -> SegmentOfResult) -> AsyncFlatMapSequence<Self, SegmentOfResult> where SegmentOfResult : AsyncSequence, SegmentOfResult.Failure == Never Creates an asynchronous sequence that concatenates the results of calling the given transformation with each element of this sequence.
@preconcurrency func flatMap<SegmentOfResult>(_ transform: @escaping (Self.Element) async -> SegmentOfResult) -> AsyncFlatMapSequence<Self, SegmentOfResult> where SegmentOfResult : AsyncSequence, Self.Failure == Never, SegmentOfResult.Failure == Never Creates an asynchronous sequence that concatenates the results of calling the given transformation with each element of this sequence.
@preconcurrency func map<Transformed>(_ transform: @escaping (Self.Element) async -> Transformed) -> AsyncMapSequence<Self, Transformed> Creates an asynchronous sequence that maps the given closure over the asynchronous sequence’s elements.
@preconcurrency func map<Transformed>(_ transform: @escaping (Self.Element) async throws -> Transformed) -> AsyncThrowingMapSequence<Self, Transformed> Creates an asynchronous sequence that maps the given error-throwing closure over the asynchronous sequence’s elements.
@warn_unqualified_access func max() async rethrows -> Self.Element? Returns the maximum element in an asynchronous sequence of comparable elements.
@warn_unqualified_access func max(by areInIncreasingOrder: (Self.Element, Self.Element) async throws -> Bool) async rethrows -> Self.Element? Returns the maximum element in the asynchronous sequence, using the given predicate as the comparison between elements.
@warn_unqualified_access func min() async rethrows -> Self.Element? Returns the minimum element in an asynchronous sequence of comparable elements.
@warn_unqualified_access func min(by areInIncreasingOrder: (Self.Element, Self.Element) async throws -> Bool) async rethrows -> Self.Element? Returns the minimum element in the asynchronous sequence, using the given predicate as the comparison between elements.
func prefix(_ count: Int) -> AsyncPrefixSequence<Self> Returns an asynchronous sequence, up to the specified maximum length, containing the initial elements of the base asynchronous sequence.
@preconcurrency func prefix(while predicate: @escaping (Self.Element) async -> Bool) rethrows -> AsyncPrefixWhileSequence<Self> Returns an asynchronous sequence, containing the initial, consecutive elements of the base sequence that satisfy the given predicate.
func reduce<Result>(_ initialResult: Result, _ nextPartialResult: (Result, Self.Element) async throws -> Result) async rethrows -> Result Returns the result of combining the elements of the asynchronous sequence using the given closure.
func reduce<Result>(into initialResult: Result, _ updateAccumulatingResult: (inout Result, Self.Element) async throws -> Void) async rethrows -> Result Returns the result of combining the elements of the asynchronous sequence using the given closure, given a mutable initial value.
protocol SendableA thread-safe type whose values can be shared across arbitrary concurrent contexts without introducing a risk of data races. Values of the type may have no shared mutable state, or they may protect that state with a lock or by forcing it to only be accessed from a specific actor.