ArraySlice

struct ArraySlice<Element>

The Array-like type that represents a sub-sequence of any Array, ContiguousArray, or other ArraySlice.

ArraySlice always uses contiguous storage and does not bridge to Objective-C.

Warning: Long-term storage of ArraySlice instances is discouraged.

Because a ArraySlice presents a view onto the storage of some larger array even after the original array's lifetime ends, storing the slice may prolong the lifetime of elements that are no longer accessible, which can manifest as apparent memory and object leakage. To prevent this effect, use ArraySlice only for transient computation.

Inheritance	`ArrayLiteralConvertible, CollectionType, CustomDebugStringConvertible, CustomStringConvertible, Indexable, MutableCollectionType, MutableIndexable, MutableSliceable, RangeReplaceableCollectionType, SequenceType, _ArrayType, _DestructorSafeContainer, _Reflectable` View Protocol Hierarchy →
Associated Types	`Generator = IndexingGenerator<ArraySlice<Element>>` Type alias inferred. `Element = Element` Type alias inferred. `Index = Int` Type alias inferred. `SubSequence = ArraySlice<Element>` Type alias inferred.
Import	`import Swift`

Initializers

init()

Construct an empty ArraySlice.

Declaration

init()

init(_:)

Construct from an arbitrary sequence with elements of type Element.

Declaration

init<S : SequenceType where S.Generator.Element == _Buffer.Element>(_ s: S)

Declared In

ArraySlice , RangeReplaceableCollectionType

init(arrayLiteral:)

Create an instance containing elements.

Declaration

init(arrayLiteral elements: Element...)

init(count:repeatedValue:)

Construct a ArraySlice of count elements, each initialized to repeatedValue.

Declaration

init(count: Int, repeatedValue: Element)

Instance Variables

var capacity: Int

The number of elements the ArraySlice can store without reallocation.

Declaration

var capacity: Int { get }

var count: Int

The number of elements the ArraySlice stores.

Declaration

var count: Int { get }

var debugDescription: String

A textual representation of self, suitable for debugging.

Declaration

var debugDescription: String { get }

var description: String

A textual representation of self.

Declaration

var description: String { get }

var endIndex: Int

A "past-the-end" element index; the successor of the last valid subscript argument.

Declaration

var endIndex: Int { get }

var first: Element?

Returns the first element of self, or nil if self is empty.

Complexity: O(1)

Declaration

var first: Element? { get }

Declared In

CollectionType

var indices: Range<Int>

Returns the range of valid index values.

The result's endIndex is the same as that of self. Because Range is half-open, iterating the values of the result produces all valid subscript arguments for self, omitting its endIndex.

Declaration

var indices: Range<Int> { get }

Declared In

CollectionType

var isEmpty: Bool

Returns true iff self is empty.

Complexity: O(1)

Declaration

var isEmpty: Bool { get }

Declared In

CollectionType

var last: Element?

Declaration

var last: Element? { get }

Declared In

CollectionType

var lazy: LazyCollection<ArraySlice<Element>>

A collection with contents identical to self, but on which normally-eager operations such as map and filter are implemented lazily.

See Also: LazySequenceType, LazyCollectionType.

Declaration

var lazy: LazyCollection<ArraySlice<Element>> { get }

Declared In

CollectionType

var startIndex: Int

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

In an empty collection, startIndex == endIndex.

Declaration

var startIndex: Int { get }

Subscripts

subscript(_: Int)

Access the indexth element. Reading is O(1). Writing is O(1) unless self's storage is shared with another live array; O(count) otherwise..

Declaration

subscript(index: Int) -> Element

subscript(_: Range<Int>)

Access the elements indicated by the given half-open subRange.

Complexity: O(1).

Declaration

subscript(subRange: Range<Int>) -> ArraySlice<Element>

Declared In

ArraySlice, MutableCollectionType

Instance Methods

mutating func append(_:)

Append newElement to the ArraySlice.

Complexity: Amortized O(1) unless self's storage is shared with another live array; O(count) otherwise..

Declaration

mutating func append(newElement: Element)

Declared In

ArraySlice, RangeReplaceableCollectionType

mutating func appendContentsOf<S : SequenceType where S.Generator.Element == Element>(_: S)

Append the elements of newElements to self.

Complexity: O(length of result).

Declaration

mutating func appendContentsOf<S : SequenceType where S.Generator.Element == Element>(newElements: S)

mutating func appendContentsOf<C : CollectionType where C.Generator.Element == Element>(_: C)

Append the elements of newElements to self.

Complexity: O(length of result).

Declaration

mutating func appendContentsOf<C : CollectionType where C.Generator.Element == Element>(newElements: C)

mutating func appendContentsOf(_:)

Append the elements of newElements to self.

Complexity: O(length of result).

Declaration

mutating func appendContentsOf<S : SequenceType where S.Generator.Element == Generator.Element>(newElements: S)

Declared In

RangeReplaceableCollectionType

func contains(_:)

Returns true iff an element in self satisfies predicate.

Declaration

func contains(@noescape predicate: (Element) throws -> Bool) rethrows -> Bool

Declared In

SequenceType

func dropFirst()

Returns a subsequence containing all but the first element.

Complexity: O(1)

Declaration

func dropFirst() -> ArraySlice<Element>

Declared In

SequenceType

func dropFirst(_:)

Returns a subsequence containing all but the first n elements.

Requires: n >= 0 Complexity: O(n)

Declaration

func dropFirst(n: Int) -> ArraySlice<Element>

Declared In

CollectionType, SequenceType

func dropLast()

Returns a subsequence containing all but the last element.

Requires: self is a finite sequence. Complexity: O(self.count)

Declaration

func dropLast() -> ArraySlice<Element>

Declared In

SequenceType

func dropLast(_:)

Returns a subsequence containing all but the last n elements.

Requires: n >= 0 Complexity: O(self.count)

Declaration

func dropLast(n: Int) -> ArraySlice<Element>

Declared In

CollectionType, SequenceType

func elementsEqual(_:isEquivalent:)

Returns true iff self and other contain equivalent elements, using isEquivalent as the equivalence test.

Requires: isEquivalent is an equivalence relation.

Declaration

func elementsEqual<OtherSequence : SequenceType where OtherSequence.Generator.Element == Generator.Element>(other: OtherSequence, @noescape isEquivalent: (Element, Element) throws -> Bool) rethrows -> Bool

Declared In

SequenceType

func enumerate()

Returns a lazy SequenceType containing pairs (n, x), where ns are consecutive Ints starting at zero, and xs are the elements of base:

> for (n, c) in "Swift".characters.enumerate() {
    print("\(n): '\(c)'")
  }
0: 'S'
1: 'w'
2: 'i'
3: 'f'
4: 't'

Declaration

func enumerate() -> EnumerateSequence<ArraySlice<Element>>

Declared In

SequenceType

func filter(_:)

Returns an Array containing the elements of self, in order, that satisfy the predicate includeElement.

Declaration

func filter(@noescape includeElement: (Element) throws -> Bool) rethrows -> [Element]

Declared In

SequenceType

func flatMap<T>(_: (Element) throws -> T?)

Returns an Array containing the non-nil results of mapping transform over self.

Complexity: O(M + N), where M is the length of self and N is the length of the result.

Declaration

func flatMap<T>(@noescape transform: (Element) throws -> T?) rethrows -> [T]

Declared In

SequenceType

func flatMap<S : SequenceType>(_: (Element) throws -> S)

Returns an Array containing the concatenated results of mapping transform over self.

s.flatMap(transform)

is equivalent to

Array(s.map(transform).flatten())

Complexity: O(M + N), where M is the length of self and N is the length of the result.

Declaration

func flatMap<S : SequenceType>(transform: (Element) throws -> S) rethrows -> [S.Generator.Element]

Declared In

SequenceType

func forEach(_:)

Call body on each element in self in the same order as a for-in loop.

sequence.forEach {
  // body code
}

is similar to:

for element in sequence {
  // body code
}

Note: You cannot use the break or continue statement to exit the current call of the body closure or skip subsequent calls. Note: Using the return statement in the body closure will only exit from the current call to body, not any outer scope, and won't skip subsequent calls.

Complexity: O(self.count)

Declaration

func forEach(@noescape body: (Element) throws -> Void) rethrows

Declared In

SequenceType

func generate()

Declaration

func generate() -> IndexingGenerator<ArraySlice<Element>>

Declared In

CollectionType

func indexOf(_:)

Returns the first index where predicate returns true for the corresponding value, or nil if such value is not found.

Complexity: O(self.count).

Declaration

func indexOf(@noescape predicate: (Element) throws -> Bool) rethrows -> Int?

Declared In

CollectionType

mutating func insert(_:atIndex:)

Insert newElement at index i.

Requires: i <= count.

Complexity: O(self.count).

Declaration

mutating func insert(newElement: Element, atIndex i: Int)

Declared In

ArraySlice, RangeReplaceableCollectionType

mutating func insertContentsOf(_:at:)

Insert newElements at index i.

Invalidates all indices with respect to self.

Complexity: O(self.count + newElements.count).

Declaration

mutating func insertContentsOf<C : CollectionType where C.Generator.Element == Generator.Element>(newElements: C, at i: Int)

Declared In

RangeReplaceableCollectionType

func lexicographicalCompare(_:isOrderedBefore:)

Returns true iff self precedes other in a lexicographical ("dictionary") ordering, using isOrderedBefore as the comparison between elements.

Note: This method implements the mathematical notion of lexicographical ordering, which has no connection to Unicode. If you are sorting strings to present to the end-user, you should use String APIs that perform localized comparison.

Requires: isOrderedBefore is a strict weak ordering over the elements of self and other.

Declaration

func lexicographicalCompare<OtherSequence : SequenceType where OtherSequence.Generator.Element == Generator.Element>(other: OtherSequence, @noescape isOrderedBefore: (Element, Element) throws -> Bool) rethrows -> Bool

Declared In

SequenceType

func map(_:)

Returns an Array containing the results of mapping transform over self.

Complexity: O(N).

Declaration

func map<T>(@noescape transform: (Element) throws -> T) rethrows -> [T]

Declared In

CollectionType, SequenceType

func maxElement(_:)

Returns the maximum element in self or nil if the sequence is empty.

Complexity: O(elements.count).

Requires: isOrderedBefore is a strict weak ordering over self.

Declaration

func maxElement(@noescape isOrderedBefore: (Element, Element) throws -> Bool) rethrows -> Element?

Declared In

SequenceType

func minElement(_:)

Returns the minimum element in self or nil if the sequence is empty.

Complexity: O(elements.count).

Requires: isOrderedBefore is a strict weak ordering over self.

Declaration

func minElement(@noescape isOrderedBefore: (Element, Element) throws -> Bool) rethrows -> Element?

Declared In

SequenceType

mutating func partition(_:isOrderedBefore:)

Re-order the given range of elements in self and return a pivot index p.

Postcondition: For all i in range.startIndex..<p, and j in p..<range.endIndex, less(self[i], self[j]) && !less(self[j], self[p]). Only returns range.endIndex when self is empty.

Requires: isOrderedBefore is a strict weak ordering over the elements in self.

Declaration

mutating func partition(range: Range<Int>, isOrderedBefore: (Element, Element) -> Bool) -> Int

Declared In

MutableCollectionType

mutating func popFirst()

If !self.isEmpty, remove the first element and return it, otherwise return nil.

Complexity: O(1)

Declaration

mutating func popFirst() -> Element?

Declared In

CollectionType

mutating func popLast()

If !self.isEmpty, remove the last element and return it, otherwise return nil.

Complexity: O(self.count)

Deprecated: it will be removed in Swift 3.

Declaration

mutating func popLast() -> Element?

Declared In

CollectionType

func prefix(_:)

Returns a subsequence, up to maxLength in length, containing the initial elements.

If maxLength exceeds self.count, the result contains all the elements of self.

Requires: maxLength >= 0 Complexity: O(maxLength)

Declaration

func prefix(maxLength: Int) -> ArraySlice<Element>

Declared In

CollectionType, SequenceType

func prefixThrough(_:)

Returns prefixUpTo(position.successor())

Complexity: O(1)

Declaration

func prefixThrough(position: Int) -> ArraySlice<Element>

Declared In

CollectionType

func prefixUpTo(_:)

Returns self[startIndex..<end]

Complexity: O(1)

Declaration

func prefixUpTo(end: Int) -> ArraySlice<Element>

Declared In

CollectionType

func reduce(_:combine:)

Returns the result of repeatedly calling combine with an accumulated value initialized to initial and each element of self, in turn, i.e. return combine(combine(...combine(combine(initial, self[0]), self[1]),...self[count-2]), self[count-1]).

Declaration

func reduce<T>(initial: T, @noescape combine: (T, Element) throws -> T) rethrows -> T

Declared In

SequenceType

mutating func removeAll(keepCapacity:)

Remove all elements.

Postcondition: capacity == 0 iff keepCapacity is false.

Complexity: O(self.count).

Declaration

mutating func removeAll(keepCapacity keepCapacity: Bool = default)

Declared In

ArraySlice, RangeReplaceableCollectionType

mutating func removeAtIndex(_:)

Remove and return the element at index i.

Invalidates all indices with respect to self.

Complexity: O(self.count).

Declaration

mutating func removeAtIndex(index: Int) -> Element

Declared In

ArraySlice, RangeReplaceableCollectionType

mutating func removeFirst()

Remove the element at startIndex and return it.

Complexity: O(self.count) Requires: !self.isEmpty.

Declaration

mutating func removeFirst() -> Element

Declared In

RangeReplaceableCollectionType, CollectionType

mutating func removeFirst(_:)

Remove the first n elements.

Complexity: O(self.count) Requires: n >= 0 && self.count >= n.

Declaration

mutating func removeFirst(n: Int)

Declared In

RangeReplaceableCollectionType, CollectionType

mutating func removeLast()

Remove an element from the end of the ArraySlice in O(1).

Requires: count > 0.

Declaration

mutating func removeLast() -> Element

Declared In

ArraySlice, RangeReplaceableCollectionType, CollectionType

mutating func removeLast(_:)

Remove the last n elements.

Complexity: O(self.count) Requires: n >= 0 && self.count >= n.

Declaration

mutating func removeLast(n: Int)

Declared In

RangeReplaceableCollectionType, CollectionType

mutating func removeRange(_:)

Remove the indicated subRange of elements.

Invalidates all indices with respect to self.

Complexity: O(self.count).

Declaration

mutating func removeRange(subRange: Range<Int>)

Declared In

RangeReplaceableCollectionType

mutating func replaceRange(_:with:)

Replace the given subRange of elements with newElements.

Complexity: O(subRange.count) if subRange.endIndex == self.endIndex and newElements.isEmpty, O(N) otherwise.

Declaration

mutating func replaceRange<C : CollectionType where C.Generator.Element == _Buffer.Element>(subRange: Range<Int>, with newElements: C)

mutating func reserveCapacity(_:)

Reserve enough space to store minimumCapacity elements.

Postcondition: capacity >= minimumCapacity and the array has mutable contiguous storage.

Complexity: O(self.count).

Declaration

mutating func reserveCapacity(minimumCapacity: Int)

Declared In

ArraySlice, RangeReplaceableCollectionType

func reverse()

Returns the elements of self in reverse order.

Complexity: O(1)

Declaration

func reverse() -> ReverseCollection<ArraySlice<Element>>

Declared In

CollectionType, SequenceType

func sort(_:)

Returns an Array containing the sorted elements of source according to isOrderedBefore.

The sorting algorithm is not stable (can change the relative order of elements for which isOrderedBefore does not establish an order).

Requires: isOrderedBefore is a strict weak ordering over the elements in self.

Declaration

func sort(@noescape isOrderedBefore: (Element, Element) -> Bool) -> [Element]

Declared In

MutableCollectionType, SequenceType

mutating func sortInPlace(_:)

Sort self in-place according to isOrderedBefore.

The sorting algorithm is not stable (can change the relative order of elements for which isOrderedBefore does not establish an order).

Requires: isOrderedBefore is a strict weak ordering over the elements in self.

Declaration

mutating func sortInPlace(@noescape isOrderedBefore: (Element, Element) -> Bool)

Declared In

MutableCollectionType

func split(_:allowEmptySlices:isSeparator:)

Returns the maximal SubSequences of self, in order, that don't contain elements satisfying the predicate isSeparator.

maxSplit: The maximum number of SubSequences to return, minus 1. If maxSplit + 1 SubSequences are returned, the last one is a suffix of self containing the remaining elements. The default value is Int.max.

allowEmptySubsequences: If true, an empty SubSequence is produced in the result for each pair of consecutive elements satisfying isSeparator. The default value is false.

Requires: maxSplit >= 0

Declaration

func split(maxSplit: Int = default, allowEmptySlices: Bool = default, @noescape isSeparator: (Element) throws -> Bool) rethrows -> [ArraySlice<Element>]

Declared In

CollectionType, SequenceType

func startsWith(_:isEquivalent:)

Returns true iff self begins with elements equivalent to those of other, using isEquivalent as the equivalence test. Returns true if other is empty.

Requires: isEquivalent is an equivalence relation.

Declaration

func startsWith<OtherSequence : SequenceType where OtherSequence.Generator.Element == Generator.Element>(other: OtherSequence, @noescape isEquivalent: (Element, Element) throws -> Bool) rethrows -> Bool

Declared In

SequenceType

func suffix(_:)

Returns a slice, up to maxLength in length, containing the final elements of s.

If maxLength exceeds s.count, the result contains all the elements of s.

Requires: maxLength >= 0 Complexity: O(self.count)

Declaration

func suffix(maxLength: Int) -> ArraySlice<Element>

Declared In

CollectionType, SequenceType

func suffixFrom(_:)

Returns self[start..<endIndex]

Complexity: O(1)

Declaration

func suffixFrom(start: Int) -> ArraySlice<Element>

Declared In

CollectionType

func underestimateCount()

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

Complexity: O(N).

Declaration

func underestimateCount() -> Int

Declared In

CollectionType, SequenceType

func withUnsafeBufferPointer(_:)

Call body(p), where p is a pointer to the ArraySlice's contiguous storage.

Often, the optimizer can eliminate bounds checks within an array algorithm, but when that fails, invoking the same algorithm on body's argument lets you trade safety for speed.

Declaration

func withUnsafeBufferPointer<R>(@noescape body: (UnsafeBufferPointer<Element>) throws -> R) rethrows -> R

mutating func withUnsafeMutableBufferPointer(_:)

Call body(p), where p is a pointer to the ArraySlice's mutable contiguous storage.

Often, the optimizer can eliminate bounds- and uniqueness-checks within an array algorithm, but when that fails, invoking the same algorithm on body's argument lets you trade safety for speed.

Warning: Do not rely on anything about self (the ArraySlice that is the target of this method) during the execution of body: it may not appear to have its correct value. Instead, use only the UnsafeMutableBufferPointer argument to body.

Declaration

mutating func withUnsafeMutableBufferPointer<R>(@noescape body: (inout UnsafeMutableBufferPointer<Element>) throws -> R) rethrows -> R

Conditionally Inherited Items

The initializers, methods, and properties listed below may be available on this type under certain conditions (such as methods that are available on Array when its elements are Equatable) or may not ever be available if that determination is beyond SwiftDoc.org's capabilities. Please open an issue on GitHub if you see something out of place!

Where Generator.Element : CollectionType

func flatten()

A concatenation of the elements of self.

Declaration

func flatten() -> FlattenCollection<ArraySlice<Element>>

Declared In

CollectionType

Where Generator.Element : CollectionType, Index : BidirectionalIndexType, Generator.Element.Index : BidirectionalIndexType

func flatten()

A concatenation of the elements of self.

Declaration

func flatten() -> FlattenBidirectionalCollection<ArraySlice<Element>>

Declared In

CollectionType

Where Generator.Element : Comparable

func lexicographicalCompare(_:)

Returns true iff self precedes other in a lexicographical ("dictionary") ordering, using "<" as the comparison between elements.

Declaration

func lexicographicalCompare<OtherSequence : SequenceType where OtherSequence.Generator.Element == Generator.Element>(other: OtherSequence) -> Bool

Declared In

SequenceType

func maxElement()

Returns the maximum element in self or nil if the sequence is empty.

Complexity: O(elements.count).

Declaration

func maxElement() -> Element?

Declared In

SequenceType

func minElement()

Returns the minimum element in self or nil if the sequence is empty.

Complexity: O(elements.count).

Declaration

func minElement() -> Element?

Declared In

SequenceType

func sort()

Returns an Array containing the sorted elements of source.

The sorting algorithm is not stable (can change the relative order of elements that compare equal).

Requires: The less-than operator (func <) defined in the Comparable conformance is a strict weak ordering over the elements in self.

Declaration

func sort() -> [Element]

Declared In

MutableCollectionType, SequenceType

Where Generator.Element : Equatable

func contains(_:)

Returns true iff element is in self.

Declaration

func contains(element: Element) -> Bool

Declared In

SequenceType

func elementsEqual(_:)

Returns true iff self and other contain the same elements in the same order.

Declaration

func elementsEqual<OtherSequence : SequenceType where OtherSequence.Generator.Element == Generator.Element>(other: OtherSequence) -> Bool

Declared In

SequenceType

func indexOf(_:)

Returns the first index where value appears in self or nil if value is not found.

Complexity: O(self.count).

Declaration

func indexOf(element: Element) -> Int?

Declared In

CollectionType

func split(_:maxSplit:allowEmptySlices:)

Returns the maximal SubSequences of self, in order, around a separator element.

allowEmptySubsequences: If true, an empty SubSequence is produced in the result for each pair of consecutive elements satisfying isSeparator. The default value is false.

Requires: maxSplit >= 0

Declaration

func split(separator: Element, maxSplit: Int = default, allowEmptySlices: Bool = default) -> [ArraySlice<Element>]

Declared In

CollectionType, SequenceType

func startsWith(_:)

Returns true iff the initial elements of self are equal to prefix. Returns true if other is empty.

Declaration

func startsWith<OtherSequence : SequenceType where OtherSequence.Generator.Element == Generator.Element>(other: OtherSequence) -> Bool

Declared In

SequenceType

Where Generator.Element : SequenceType

func flatten()

A concatenation of the elements of self.

Declaration

func flatten() -> FlattenSequence<ArraySlice<Element>>

Declared In

SequenceType

func joinWithSeparator(_:)

Returns a view, whose elements are the result of interposing a given separator between the elements of the sequence self.

For example, [[1, 2, 3], [4, 5, 6], [7, 8, 9]].joinWithSeparator([-1, -2]) yields [1, 2, 3, -1, -2, 4, 5, 6, -1, -2, 7, 8, 9].

Declaration

func joinWithSeparator<Separator : SequenceType where Separator.Generator.Element == Generator.Element.Generator.Element>(separator: Separator) -> JoinSequence<ArraySlice<Element>>

Declared In

SequenceType

Where Generator.Element == String

func joinWithSeparator(_:)

Interpose the separator between elements of self, then concatenate the result. For example:

["foo", "bar", "baz"].joinWithSeparator("-|-") // "foo-|-bar-|-baz"

Declaration

func joinWithSeparator(separator: String) -> String

Declared In

SequenceType

Where Index : RandomAccessIndexType, Generator.Element : Comparable

mutating func partition(_:)

Re-order the given range of elements in self and return a pivot index p.

Postcondition: For all i in range.startIndex..<p, and j in p..<range.endIndex, less(self[i], self[j]) && !less(self[j], self[p]). Only returns range.endIndex when self is empty.

Requires: The less-than operator (func <) defined in the Comparable conformance is a strict weak ordering over the elements in self.

Declaration

mutating func partition(range: Range<Int>) -> Int

Declared In

MutableCollectionType

mutating func sortInPlace()

Sort self in-place.

The sorting algorithm is not stable (can change the relative order of elements that compare equal).

Requires: The less-than operator (func <) defined in the Comparable conformance is a strict weak ordering over the elements in self.

Declaration

mutating func sortInPlace()

Declared In

MutableCollectionType

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