A type-erased wrapper over any collection with indices that support bidirectional traversal.
@frozen struct AnyBidirectionalCollection<Element>An AnyBidirectionalCollection instance forwards its operations to a base collection having the same Element type, hiding the specifics of the underlying collection.
typealias IndexA type that represents a position in the collection.
typealias IndicesA type that represents the indices that are valid for subscripting the collection, in ascending order.
typealias IteratorA type that provides the collection’s iteration interface and encapsulates its iteration state.
typealias SubSequenceA collection representing a contiguous subrange of this collection’s elements. The subsequence shares indices with the original collection.
init<C>(C)Creates a type-erased collection that wraps the given collection.
init<C>(C)Creates a type-erased collection that wraps the given collection.
init(AnyRandomAccessCollection<Element>)Creates an AnyBidirectionalCollection having the same underlying collection as other.
init(AnyBidirectionalCollection<Element>)Creates an AnyBidirectionalCollection having the same underlying collection as other.
init?(AnyCollection<Element>)Creates an AnyBidirectionalCollection having the same underlying collection as other.
subscript(Range<AnyBidirectionalCollection<Element>.Index>) -> AnyBidirectionalCollection<Element>.SubSequenceAccesses a contiguous subrange of the collection’s elements.
subscript(AnyBidirectionalCollection<Element>.Index) -> ElementAccesses the element indicated by position.
subscript((UnboundedRange_) -> ()) -> Self.SubSequencesubscript<R>(R) -> Self.SubSequenceAccesses the contiguous subrange of the collection’s elements specified by a range expression.
var count: IntThe number of elements.
var count: IntThe number of elements in the collection.
var endIndex: AnyBidirectionalCollection<Element>.IndexThe collection’s “past the end” position—that is, the position one greater than the last valid subscript argument.
var first: Self.Element?The first element of the collection.
var indices: DefaultIndices<Self>The indices that are valid for subscripting the collection, in ascending order.
var isEmpty: BoolA Boolean value indicating whether the collection is empty.
var last: Self.Element?The last element of the collection.
var lazy: LazySequence<Self>A sequence containing the same elements as this sequence, but on which some operations, such as map and filter, are implemented lazily.
var startIndex: AnyBidirectionalCollection<Element>.IndexThe position of the first element in a non-empty collection.
var underestimatedCount: IntA value less than or equal to the number of elements in the sequence, calculated nondestructively.
var underestimatedCount: IntA value less than or equal to the number of elements in the collection.
var underestimatedCount: IntA value less than or equal to the number of elements in the sequence, calculated nondestructively.
func allSatisfy((Self.Element) throws -> Bool) rethrows -> BoolReturns a Boolean value indicating whether every element of a sequence satisfies a given predicate.
func compactMap<ElementOfResult>((Self.Element) throws -> ElementOfResult?) rethrows -> [ElementOfResult]Returns an array containing the non-nil results of calling the given transformation with each element of this sequence.
func contains(Self.Element) -> BoolReturns a Boolean value indicating whether the sequence contains the given element.
func contains(where: (Self.Element) throws -> Bool) rethrows -> BoolReturns a Boolean value indicating whether the sequence contains an element that satisfies the given predicate.
func difference<C>(from: C) -> CollectionDifference<Self.Element>Returns the difference needed to produce this collection’s ordered elements from the given collection.
func difference<C>(from: C, by: (C.Element, Self.Element) -> Bool) -> CollectionDifference<Self.Element>Returns the difference needed to produce this collection’s ordered elements from the given collection, using the given predicate as an equivalence test.
func distance(from: AnyBidirectionalCollection<Element>.Index, to: AnyBidirectionalCollection<Element>.Index) -> IntReturns the distance between two indices.
func drop(while: (Element) throws -> Bool) rethrows -> AnyBidirectionalCollection<Element>func dropFirst(Int) -> AnyBidirectionalCollection<Element>func dropLast(Int) -> AnyBidirectionalCollection<Element>func elementsEqual<OtherSequence>(OtherSequence) -> BoolReturns a Boolean value indicating whether this sequence and another sequence contain the same elements in the same order.
func elementsEqual<OtherSequence>(OtherSequence, by: (Self.Element, OtherSequence.Element) throws -> Bool) rethrows -> BoolReturns a Boolean value indicating whether this sequence and another sequence contain equivalent elements in the same order, using the given predicate as the equivalence test.
func enumerated() -> EnumeratedSequence<Self>Returns a sequence of pairs (n, x), where n represents a consecutive integer starting at zero and x represents an element of the sequence.
func filter((Element) throws -> Bool) rethrows -> [Element]func first(where: (Self.Element) throws -> Bool) rethrows -> Self.Element?Returns the first element of the sequence that satisfies the given predicate.
func firstIndex(of: Self.Element) -> Self.Index?Returns the first index where the specified value appears in the collection.
func firstIndex(where: (Self.Element) throws -> Bool) rethrows -> Self.Index?Returns the first index in which an element of the collection satisfies the given predicate.
func flatMap<SegmentOfResult>((Self.Element) throws -> SegmentOfResult) rethrows -> [SegmentOfResult.Element]Returns an array containing the concatenated results of calling the given transformation with each element of this sequence.
func forEach((Element) throws -> Void) rethrowsfunc formIndex(inout AnyBidirectionalCollection<Element>.Index, offsetBy: Int)func formIndex(inout AnyBidirectionalCollection<Element>.Index, offsetBy: Int, limitedBy: AnyBidirectionalCollection<Element>.Index) -> Boolfunc formIndex(after: inout AnyBidirectionalCollection<Element>.Index)Replaces the given index with its successor.
func formIndex(before: inout AnyBidirectionalCollection<Element>.Index)Replaces the given index with its predecessor.
func index(AnyBidirectionalCollection<Element>.Index, offsetBy: Int) -> AnyBidirectionalCollection<Element>.IndexReturns an index that is the specified distance from the given index.
func index(AnyBidirectionalCollection<Element>.Index, offsetBy: Int, limitedBy: AnyBidirectionalCollection<Element>.Index) -> AnyBidirectionalCollection<Element>.Index?Returns an index that is the specified distance from the given index, unless that distance is beyond a given limiting index.
func index(after: AnyBidirectionalCollection<Element>.Index) -> AnyBidirectionalCollection<Element>.IndexReturns the position immediately after the given index.
func index(before: AnyBidirectionalCollection<Element>.Index) -> AnyBidirectionalCollection<Element>.IndexReturns the position immediately before the given index.
func joined() -> FlattenSequence<Self>Returns the elements of this sequence of sequences, concatenated.
func joined(separator: String) -> StringReturns a new string by concatenating the elements of the sequence, adding the given separator between each element.
func joined<Separator>(separator: Separator) -> JoinedSequence<Self>Returns the concatenated elements of this sequence of sequences, inserting the given separator between each element.
func joined(separator: String) -> StringReturns a new string by concatenating the elements of the sequence, adding the given separator between each element.
func last(where: (Self.Element) throws -> Bool) rethrows -> Self.Element?Returns the last element of the sequence that satisfies the given predicate.
func lastIndex(of: Self.Element) -> Self.Index?Returns the last index where the specified value appears in the collection.
func lastIndex(where: (Self.Element) throws -> Bool) rethrows -> Self.Index?Returns the index of the last element in the collection that matches the given predicate.
func lexicographicallyPrecedes<OtherSequence>(OtherSequence) -> BoolReturns a Boolean value indicating whether the sequence precedes another sequence in a lexicographical (dictionary) ordering, using the less-than operator (<) to compare elements.
func lexicographicallyPrecedes<OtherSequence>(OtherSequence, by: (Self.Element, Self.Element) throws -> Bool) rethrows -> BoolReturns a Boolean value indicating whether the sequence precedes another sequence in a lexicographical (dictionary) ordering, using the given predicate to compare elements.
func makeIterator() -> AnyBidirectionalCollection<Element>.IteratorReturns an iterator over the elements of this collection.
func map<T>((Element) throws -> T) rethrows -> [T]func map<T>((Self.Element) throws -> T) rethrows -> [T]Returns an array containing the results of mapping the given closure over the sequence’s elements.
func map<T>((Self.Element) throws -> T) rethrows -> [T]Returns an array containing the results of mapping the given closure over the sequence’s elements.
func max() -> Self.Element?Returns the maximum element in the sequence.
func max(by: (Self.Element, Self.Element) throws -> Bool) rethrows -> Self.Element?Returns the maximum element in the sequence, using the given predicate as the comparison between elements.
func min() -> Self.Element?Returns the minimum element in the sequence.
func min(by: (Self.Element, Self.Element) throws -> Bool) rethrows -> Self.Element?Returns the minimum element in the sequence, using the given predicate as the comparison between elements.
func popFirst() -> Self.Element?Removes and returns the first element of the collection.
func popLast() -> Self.Element?Removes and returns the last element of the collection.
func prefix(Int) -> AnyBidirectionalCollection<Element>func prefix(through: Self.Index) -> Self.SubSequenceReturns a subsequence from the start of the collection through the specified position.
func prefix(upTo: Self.Index) -> Self.SubSequenceReturns a subsequence from the start of the collection up to, but not including, the specified position.
func prefix(while: (Element) throws -> Bool) rethrows -> AnyBidirectionalCollection<Element>func randomElement() -> Self.Element?Returns a random element of the collection.
func randomElement<T>(using: inout T) -> Self.Element?Returns a random element of the collection, using the given generator as a source for randomness.
func reduce<Result>(Result, (Result, Self.Element) throws -> Result) rethrows -> ResultReturns the result of combining the elements of the sequence using the given closure.
func reduce<Result>(into: Result, (inout Result, Self.Element) throws -> ()) rethrows -> ResultReturns the result of combining the elements of the sequence using the given closure.
func removeFirst() -> Self.ElementRemoves and returns the first element of the collection.
func removeFirst(Int)Removes the specified number of elements from the beginning of the collection.
func removeLast() -> Self.ElementRemoves and returns the last element of the collection.
func removeLast(Int)Removes the given number of elements from the end of the collection.
func reversed() -> ReversedCollection<Self>Returns a view presenting the elements of the collection in reverse order.
func shuffled() -> [Self.Element]Returns the elements of the sequence, shuffled.
func shuffled<T>(using: inout T) -> [Self.Element]Returns the elements of the sequence, shuffled using the given generator as a source for randomness.
func sorted() -> [Self.Element]Returns the elements of the sequence, sorted.
func sorted(by: (Self.Element, Self.Element) throws -> Bool) rethrows -> [Self.Element]Returns the elements of the sequence, sorted using the given predicate as the comparison between elements.
func split(maxSplits: Int, omittingEmptySubsequences: Bool, whereSeparator: (Self.Element) throws -> Bool) rethrows -> [Self.SubSequence]Returns the longest possible subsequences of the collection, in order, that don’t contain elements satisfying the given predicate.
func split(separator: Self.Element, maxSplits: Int, omittingEmptySubsequences: Bool) -> [Self.SubSequence]Returns the longest possible subsequences of the collection, in order, around elements equal to the given element.
func split(separator: Self.Element, maxSplits: Int, omittingEmptySubsequences: Bool) -> [ArraySlice<Self.Element>]Returns the longest possible subsequences of the sequence, in order, around elements equal to the given element.
func starts<PossiblePrefix>(with: PossiblePrefix) -> BoolReturns a Boolean value indicating whether the initial elements of the sequence are the same as the elements in another sequence.
func starts<PossiblePrefix>(with: PossiblePrefix, by: (Self.Element, PossiblePrefix.Element) throws -> Bool) rethrows -> BoolReturns a Boolean value indicating whether the initial elements of the sequence are equivalent to the elements in another sequence, using the given predicate as the equivalence test.
func suffix(Int) -> AnyBidirectionalCollection<Element>func suffix(from: Self.Index) -> Self.SubSequenceReturns a subsequence from the specified position to the end of the collection.
func withContiguousStorageIfAvailable<R>((UnsafeBufferPointer<Self.Element>) throws -> R) rethrows -> R?Executes a closure on the sequence’s contiguous storage.
func flatMap<ElementOfResult>((Self.Element) throws -> ElementOfResult?) rethrows -> [ElementOfResult]func index(of: Self.Element) -> Self.Index?Returns the first index where the specified value appears in the collection.