SubSequence

import Swift

@frozen struct LazySequence<Base> where Base : Sequence

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

@frozen struct Slice<Base> where Base : Collection

A view into a subsequence of elements of another collection.

protocol Collection<Element> : Sequence

A sequence whose elements can be traversed multiple times, nondestructively, and accessed by an indexed subscript.

var count: Int { get }

Returns the number of elements.

var endIndex: LazySequence<Base>.Index { get }

The collection’s “past the end” position—that is, the position one greater than the last valid subscript argument.

var indices: LazySequence<Base>.Indices { get }

var isEmpty: Bool { get }

A Boolean value indicating whether the collection is empty.

var startIndex: LazySequence<Base>.Index { get }

The position of the first element in a non-empty collection.

subscript(position: LazySequence<Base>.Index) -> LazySequence<Base>.Element { get }

Accesses the element at position.

func distance(from start: LazySequence<Base>.Index, to end: LazySequence<Base>.Index) -> Int

func index(_ i: LazySequence<Base>.Index, offsetBy n: Int) -> LazySequence<Base>.Index

func index(_ i: LazySequence<Base>.Index, offsetBy n: Int, limitedBy limit: LazySequence<Base>.Index) -> LazySequence<Base>.Index?

func index(after i: LazySequence<Base>.Index) -> LazySequence<Base>.Index

typealias Index = Base.Index

A type that represents a valid position in the collection.

typealias Indices = Base.Indices