Structure_Concurrency5.9.0
AsyncThrowingPrefixWhileSequence
An asynchronous sequence, containing the initial, consecutive elements of the base sequence that satisfy the given error-throwing predicate.
- iOS
- 13.0+
- macOS
- 10.15+
- tvOS
- 13.0+
- watchOS
- 6.0+
struct AsyncThrowingPrefixWhileSequence<Base> where Base : AsyncSequenceCitizens in _Concurrency
where Base:AsyncSequenceConformances
protocol AsyncSequenceA type that provides asynchronous, sequential, iterated access to its elements.
Members
func makeAsyncIterator() -> AsyncThrowingPrefixWhileSequence<Base>.Iterator struct IteratorThe iterator that produces elements of the prefix-while sequence.
typealias AsyncIteratorThe type of iterator that produces elements of the sequence.
typealias ElementThe type of element produced by this asynchronous sequence.
Features
func allSatisfy((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.
func compactMap<ElementOfResult>((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.
func compactMap<ElementOfResult>((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(Self.Element) async rethrows -> Bool Returns a Boolean value that indicates whether the asynchronous sequence contains the given element.
func contains(where: (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.
func drop(while: (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(Int) -> AsyncDropFirstSequence<Self> Omits a specified number of elements from the base asynchronous sequence, then passes through all remaining elements.
func filter((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: (Self.Element) async throws -> Bool) async rethrows -> Self.Element? Returns the first element of the sequence that satisfies the given predicate.
func flatMap<SegmentOfResult>((Self.Element) async throws -> SegmentOfResult) -> AsyncThrowingFlatMapSequence<Self, SegmentOfResult> Creates an asynchronous sequence that concatenates the results of calling the given error-throwing transformation with each element of this sequence.
func flatMap<SegmentOfResult>((Self.Element) async -> SegmentOfResult) -> AsyncFlatMapSequence<Self, SegmentOfResult> Creates an asynchronous sequence that concatenates the results of calling the given transformation with each element of this sequence.
func map<Transformed>((Self.Element) async -> Transformed) -> AsyncMapSequence<Self, Transformed> Creates an asynchronous sequence that maps the given closure over the asynchronous sequence’s elements.
func map<Transformed>((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.
func max() async rethrows -> Self.Element? Returns the maximum element in an asynchronous sequence of comparable elements.
func max(by: (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.
func min() async rethrows -> Self.Element? Returns the minimum element in an asynchronous sequence of comparable elements.
func min(by: (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(Int) -> AsyncPrefixSequence<Self> Returns an asynchronous sequence, up to the specified maximum length, containing the initial elements of the base asynchronous sequence.
func prefix(while: (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>(Result, (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: Result, (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.
Citizens in _Concurrency
where Base:Sendable, Base:AsyncSequence, Base.Element:SendableConformances
protocol SendableA type whose values can safely be passed across concurrency domains by copying.