Generic Structure

AnySequence

A type-erased sequence.

Overview

An instance of AnySequence forwards its operations to an underlying base sequence having the same Element type, hiding the specifics of the underlying sequence.

Symbols

Type Aliases

Initializers

init<S>(S)

Creates a new sequence that wraps and forwards operations to base.

init<I>(() -> I)

Creates a sequence whose makeIterator() method forwards to makeUnderlyingIterator.

Instance Properties

var lazy: LazySequence<AnySequence<Element>>

A sequence containing the same elements as this sequence, but on which some operations, such as map and filter, are implemented lazily.

var underestimatedCount: Int
var underestimatedCount: Int

Returns a value less than or equal to the number of elements in the sequence, nondestructively.

Instance Methods

func contains(where: (Element) -> Bool)

Returns a Boolean value indicating whether the sequence contains an element that satisfies the given predicate.

func drop(while: (Element) -> Bool)
func dropFirst()

Returns a subsequence containing all but the first element of the sequence.

func dropFirst(Int)
func dropLast()

Returns a subsequence containing all but the last element of the sequence.

func dropLast(Int)
func elementsEqual<OtherSequence>(OtherSequence)

Returns a Boolean value indicating whether this sequence and another sequence contain the same elements in the same order.

func elementsEqual<OtherSequence>(OtherSequence, by: (Element, Element) -> Bool)

Returns a Boolean value indicating whether this sequence and another sequence contain equivalent elements, using the given predicate as the equivalence test.

func enumerated()

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) -> Bool)
func first(where: (Element) -> Bool)

Returns the first element of the sequence that satisfies the given predicate.

func flatMap<SegmentOfResult>((Element) -> SegmentOfResult)

Returns an array containing the concatenated results of calling the given transformation with each element of this sequence.

func flatMap<ElementOfResult>((Element) -> ElementOfResult?)

Returns an array containing the non-nil results of calling the given transformation with each element of this sequence.

func forEach((Element) -> Void)
func joined()

Returns the elements of this sequence of sequences, concatenated.

func joined<Separator>(separator: Separator)

Returns the concatenated elements of this sequence of sequences, inserting the given separator between each element.

func joined(separator: String)

Returns a new string by concatenating the elements of the sequence, adding the given separator between each element.

func lexicographicallyPrecedes<OtherSequence>(OtherSequence)

Returns 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: (Element, Element) -> Bool)

Returns a Boolean value indicating whether the sequence precedes another sequence in a lexicographical (dictionary) ordering, using the given predicate to compare elements.

func makeIterator()

Returns an iterator over the elements of this sequence.

func map<T>((Element) -> T)

Returns an array containing the results of mapping the given closure over the sequence’s elements.

func map<T>((Element) -> T)
func max()

Returns the maximum element in the sequence.

func max(by: (Element, Element) -> Bool)

Returns the maximum element in the sequence, using the given predicate as the comparison between elements.

func min()

Returns the minimum element in the sequence.

func min(by: (Element, Element) -> Bool)

Returns the minimum element in the sequence, using the given predicate as the comparison between elements.

func prefix(Int)func prefix(while: (Element) -> Bool)
func reduce<Result>(Result, (Result, Element) -> Result)

Returns the result of combining the elements of the sequence using the given closure.

func reversed()

Returns an array containing the elements of this sequence in reverse order.

func sorted()

Returns the elements of the sequence, sorted.

func sorted(by: (Element, Element) -> Bool)

Returns the elements of the sequence, sorted using the given predicate as the comparison between elements.

func split(maxSplits: Int, omittingEmptySubsequences: Bool, whereSeparator: (Element) -> Bool)
func split(separator: Element, maxSplits: Int, omittingEmptySubsequences: Bool)

Returns the longest possible subsequences of the sequence, in order, around elements equal to the given element.

func starts<PossiblePrefix>(with: PossiblePrefix)

Returns 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: (Element, Element) -> Bool)

Returns 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)

Relationships

Conforms To

See Also

Related Symbols

AnyIterator