var count: IntThe number of elements in the collection.
var first: Self.Element?The first element of the collection.
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 underestimatedCount: IntA value less than or equal to the number of elements in the collection.
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 compare<Comparator>(Comparator.Compared, Comparator.Compared) -> ComparisonResultIf lhs is ordered before rhs in the ordering described by the given sequence of SortComparators
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 count<E>(where: (Self.Element) throws(E) -> Bool) throws(E) -> IntReturns the number of elements in the sequence that satisfy 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 drop(while: (Self.Element) throws -> Bool) rethrows -> Self.SubSequenceReturns a subsequence by skipping elements while predicate returns true and returning the remaining elements.
func dropFirst(Int) -> Self.SubSequenceReturns a subsequence containing all but the given number of initial elements.
func dropLast(Int) -> Self.SubSequenceReturns a subsequence containing all but the specified number of final elements.
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((Self.Element) throws -> Bool) rethrows -> [Self.Element]Returns an array containing, in order, the elements of the sequence that satisfy the given predicate.
func filter(Predicate<Self.Element>) throws -> [Self.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 firstRange<C>(of: C) -> Range<Self.Index>?Finds and returns the range of the first occurrence of a given collection within this collection.
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((Self.Element) throws -> Void) rethrowsCalls the given closure on each element in the sequence in the same order as a for-in loop.
func formIndex(inout Self.Index, offsetBy: Int)Offsets the given index by the specified distance.
func formIndex(inout Self.Index, offsetBy: Int, limitedBy: Self.Index) -> BoolOffsets the given index by the specified distance, or so that it equals the given limiting index.
func formIndex(after: inout Self.Index)Replaces the given index with its successor.
func formIndex(before: inout Self.Index)func formatted<S>(S) -> S.FormatOutputfunc index(Self.Index, offsetBy: Int, limitedBy: Self.Index) -> Self.Index?Returns an index that is the specified distance from the given index, unless that distance is beyond a given limiting index.
func indices(of: Self.Element) -> RangeSet<Self.Index>Returns the indices of all the elements that are equal to the given element.
func indices(where: (Self.Element) throws -> Bool) rethrows -> RangeSet<Self.Index>Returns the indices of all the elements that match the given predicate.
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, 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() -> IndexingIterator<Self>Returns an iterator over the elements of the collection.
func map<T, E>((Self.Element) throws(E) -> T) throws(E) -> [T]Returns an array containing the results of mapping the given closure over the sequence’s elements.
func map<T, E>((Self.Element) throws(E) -> T) throws(E) -> [T]Returns an array containing the results of mapping the given closure over the sequence’s elements.
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(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 prefix(Int) -> Self.SubSequenceReturns a subsequence, up to the specified maximum length, containing the initial elements of the collection.
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: (Self.Element) throws -> Bool) rethrows -> Self.SubSequenceReturns a subsequence containing the initial elements until predicate returns false and skipping the remaining elements.
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 ranges<C>(of: C) -> [Range<Self.Index>]Finds and returns the ranges of the all occurrences of a given sequence within the collection.
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 removingSubranges(RangeSet<Self.Index>) -> DiscontiguousSlice<Self>Returns a collection of the elements in this collection that are not represented by the given range set.
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(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 sorted<Comparator>(using: Comparator) -> [Self.Element]Returns the elements of the sequence, sorted using the given comparator to compare elements.
func sorted<S, Comparator>(using: S) -> [Self.Element]Returns the elements of the sequence, sorted using the given array of SortComparators to compare 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 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) -> Self.SubSequenceReturns a subsequence, up to the given maximum length, containing the final elements of the collection.
func suffix(from: Self.Index) -> Self.SubSequenceReturns a subsequence from the specified position to the end of the collection.
func trimmingPrefix<Prefix>(Prefix) -> Self.SubSequenceReturns a new collection of the same type by removing prefix from the start of the collection.
func trimmingPrefix(while: (Self.Element) throws -> Bool) rethrows -> Self.SubSequencefunc withContiguousStorageIfAvailable<R>((UnsafeBufferPointer<Self.Element>) throws -> R) rethrows -> R?