var count: Int
The number of elements in the collection.
var first: Self.Element?
The first element of the collection.
var indices: DefaultIndices<Self>
The indices that are valid for subscripting the collection, in ascending order.
var isEmpty: Bool
A 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: Int
A value less than or equal to the number of elements in the collection.
func allSatisfy((Self.Element) throws -> Bool) rethrows -> Bool
Returns 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) -> ComparisonResult
If lhs
is ordered before rhs
in the ordering described by the given sequence of SortComparator
s
func contains(where: (Self.Element) throws -> Bool) rethrows -> Bool
Returns a Boolean value indicating whether the sequence contains an element that satisfies the given predicate.
func count<E>(where: (Self.Element)throws
Returns the number of elements in the sequence that satisfy the given predicate.
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 distance(from: Self.Index, to: Self.Index) -> Int
func drop(while: (Self.Element) throws -> Bool) rethrows -> Self.SubSequence
Returns a subsequence by skipping elements while predicate
returns true
and returning the remaining elements.
func dropFirst(Int) -> Self.SubSequence
Returns a subsequence containing all but the given number of initial elements.
func dropLast(Int) -> Self.SubSequence
Returns a subsequence containing all but the specified number of final elements.
func elementsEqual<OtherSequence>(OtherSequence, by: (Self.Element, OtherSequence.Element) throws -> Bool) rethrows -> Bool
Returns 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(where: (Self.Element) throws -> Bool) rethrows -> Self.Index?
Returns the first index in which an element of the collection satisfies the given predicate.
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) rethrows
Calls 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) -> Bool
Offsets 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 index(Self.Index, offsetBy: Int) -> Self.Index
func index(Self.Index, offsetBy: Int, limitedBy: Self.Index) -> Self.Index?
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(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 -> 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 map<T, E>((Self.Element)throws
Returns an array containing the results of mapping the given closure over the sequence’s elements.
func map<T, E>((Self.Element)throws
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.SubSequence
Returns a subsequence, up to the specified maximum length, containing the initial elements of the collection.
func prefix(through: Self.Index) -> Self.SubSequence
Returns a subsequence from the start of the collection through the specified position.
func prefix(upTo: Self.Index) -> Self.SubSequence
Returns 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.SubSequence
Returns 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 reduce<Result>(Result, (Result, Self.Element) throws -> Result) rethrows -> Result
Returns the result of combining the elements of the sequence using the given closure.
func reduce<Result>(into: Result, (inout Result, Self.Element) throws -> ()) rethrows -> Result
Returns 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 SortComparator
s 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 starts<PossiblePrefix>(with: PossiblePrefix, by: (Self.Element, PossiblePrefix.Element) throws -> Bool) rethrows -> 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) -> Self.SubSequence
Returns a subsequence, up to the given maximum length, containing the final elements of the collection.
func suffix(from: Self.Index) -> Self.SubSequence
Returns a subsequence from the specified position to the end of the collection.
func trimmingPrefix(while: (Self.Element) throws -> Bool) rethrows -> Self.SubSequence
func withContiguousStorageIfAvailable<R>((UnsafeBufferPointer<Self.Element>) throws -> R) rethrows -> R?