A type-erased wrapper over any collection with indices that support bidirectional traversal.
SDK
Framework
@frozen struct AnyBidirectionalCollection<Element>
An Any instance forwards its operations to a base collection having the same Element type, hiding the specifics of the underlying collection.
typealias AnyA type that represents a position in the collection.
typealias AnyA type that represents the indices that are valid for subscripting the collection, in ascending order.
typealias AnyA type that provides the collection’s iteration interface and encapsulates its iteration state.
typealias AnyA sequence that represents a contiguous subrange of the collection’s elements.
init(AnyCreates an Any having the same underlying collection as other.
init(AnyCreates an Any having the same underlying collection as other.
init?(AnyCreates an Any having the same underlying collection as other.
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.
var count: IntThe number of elements.
var endThe collection’s “past the end” position—that is, the position one greater than the last valid subscript argument.
var first: Element?The first element of the collection.
var indices: DefaultThe indices that are valid for subscripting the collection, in ascending order.
var isA Boolean value indicating whether the collection is empty.
var last: Element?The last element of the collection.
var lazy: LazyA sequence containing the same elements as this sequence, but on which some operations, such as map and filter, are implemented lazily.
var startThe position of the first element in a non-empty collection.
var underestimatedA value less than or equal to the number of elements in the sequence, calculated nondestructively.
func allReturns a Boolean value indicating whether every element of a sequence satisfies a given predicate.
func compactReturns an array containing the non-nil results of calling the given transformation with each element of this sequence.
func contains(Element) -> BoolReturns a Boolean value indicating whether the sequence contains the given element.
func contains(where: (Element) -> Bool) -> BoolReturns a Boolean value indicating whether the sequence contains an element that satisfies the given predicate.
func difference<C>(from: C) -> CollectionReturns the difference needed to produce this collection’s ordered elements from the given collection.
func difference<C>(from: C, by: (CReturns 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: AnyReturns the distance between two indices.
func elementsReturns a Boolean value indicating whether this sequence and another sequence contain the same elements in the same order.
func elementsReturns 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() -> EnumeratedReturns a sequence of pairs (n, x), where n represents a consecutive integer starting at zero and x represents an element of the sequence.
func first(where: (Element) -> Bool) -> Element?Returns the first element of the sequence that satisfies the given predicate.
func firstReturns the first index where the specified value appears in the collection.
func firstReturns the first index in which an element of the collection satisfies the given predicate.
func flatReturns an array containing the concatenated results of calling the given transformation with each element of this sequence.
func formReplaces the given index with its successor.
func formReplaces the given index with its predecessor.
func index(AnyReturns an index that is the specified distance from the given index.
func index(AnyReturns an index that is the specified distance from the given index, unless that distance is beyond a given limiting index.
func index(after: AnyReturns the position immediately after the given index.
func index(before: AnyReturns the position immediately before the given index.
func index(of: Element) -> AnyReturns the first index where the specified value appears in the collection.
func index(where: (Element) -> Bool) -> AnyReturns the first index in which an element of the collection satisfies the given predicate.
func joined() -> FlattenReturns the elements of this sequence of sequences, concatenated.
func joined<Separator>(separator: Separator) -> JoinedReturns 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 joined(separator: String) -> StringReturns a new string by concatenating the elements of the sequence, adding the given separator between each element.
func last(where: (Element) -> Bool) -> Element?Returns the last element of the sequence that satisfies the given predicate.
func lastReturns the last index where the specified value appears in the collection.
func lastReturns the index of the last element in the collection that matches the given predicate.
func lexicographicallyReturns a Boolean value indicating whether the sequence precedes another sequence in a lexicographical (dictionary) ordering, using the less-than operator (<) to compare elements.
func lexicographicallyReturns a Boolean value indicating whether the sequence precedes another sequence in a lexicographical (dictionary) ordering, using the given predicate to compare elements.
func makeReturns an iterator over the elements of this collection.
func max() -> Element?Returns the maximum element in the sequence.
func max(by: (Element, Element) -> Bool) -> Element?Returns the maximum element in the sequence, using the given predicate as the comparison between elements.
func min() -> Element?Returns the minimum element in the sequence.
func min(by: (Element, Element) -> Bool) -> Element?Returns the minimum element in the sequence, using the given predicate as the comparison between elements.
func popRemoves and returns the first element of the collection.
func popRemoves and returns the last element of the collection.
func prefix(through: AnyReturns a subsequence from the start of the collection through the specified position.
func prefix(upReturns a subsequence from the start of the collection up to, but not including, the specified position.
func randomReturns a random element of the collection.
func randomReturns a random element of the collection, using the given generator as a source for randomness.
func reduce<Result>(Result, (Result, Element) -> Result) -> ResultReturns the result of combining the elements of the sequence using the given closure.
func reduce<Result>(into: Result, (inout Result, Element) -> ()) -> ResultReturns the result of combining the elements of the sequence using the given closure.
func removeRemoves and returns the first element of the collection.
func removeRemoves the specified number of elements from the beginning of the collection.
func removeRemoves and returns the last element of the collection.
func removeRemoves the given number of elements from the end of the collection.
func reversed() -> ReversedReturns a view presenting the elements of the collection in reverse order.
func shuffled() -> [Element]Returns the elements of the sequence, shuffled.
func shuffled<T>(using: inout T) -> [Element]Returns the elements of the sequence, shuffled using the given generator as a source for randomness.
func sorted() -> [Element]Returns the elements of the sequence, sorted.
func sorted(by: (Element, Element) -> Bool) -> [Element]Returns the elements of the sequence, sorted using the given predicate as the comparison between elements.
func split(maxReturns the longest possible subsequences of the collection, in order, that don’t contain elements satisfying the given predicate.
func split(separator: Element, maxReturns the longest possible subsequences of the collection, in order, around elements equal to the given element.
func split(separator: Element, maxReturns the longest possible subsequences of the sequence, in order, around elements equal to the given element.
func starts<PossibleReturns a Boolean value indicating whether the initial elements of the sequence are the same as the elements in another sequence.
func starts<PossibleReturns 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(from: AnyReturns a subsequence from the specified position to the end of the collection.
func withCall body(p), where p is a pointer to the collection’s contiguous storage. If no such storage exists, it is first created. If the collection does not support an internal representation in a form of contiguous storage, body is not called and nil is returned.
subscript(Range<AnyAccesses a contiguous subrange of the collection’s elements.
subscript(AnyAccesses the element indicated by position.
subscript<R>(R) -> AnyAccesses the contiguous subrange of the collection’s elements specified by a range expression.
struct AnyA type-erased sequence.
struct AnyA type-erased wrapper over any collection with indices that support forward traversal.
struct AnyA type-erased wrapper over any collection with indices that support random access traversal.
struct AnyA type-erased iterator of Element.
struct AnyA wrapper over an underlying index that hides the specific underlying type.
struct AnyA type-erased hashable value.