Structureswift 6.0.1Swift
EnumeratedSequence
An enumeration of the elements of a sequence or collection.
@frozen struct EnumeratedSequence<Base> where Base : Sequence
EnumeratedSequence
is a sequence of pairs (n, x), where ns are consecutive Int
values starting at zero, and xs are the elements of a base sequence.
To create an instance of EnumeratedSequence
, call enumerated()
on a sequence or collection. The following example enumerates the elements of an array.
var s = ["foo", "bar"].enumerated()
for (n, x) in s {
print("\(n): \(x)")
}
// Prints "0: foo"
// Prints "1: bar"
Citizens in Swift
where Base:Sequence
Conformances
protocol Copyable
A type whose values can be implicitly or explicitly copied.
protocol Escapable
protocol Sequence<Element>
A type that provides sequential, iterated access to its elements.
Types
struct Iterator
The iterator for
EnumeratedSequence
.
Instance members
Instance features
var lazy: LazySequence<Self>
A sequence containing the same elements as this sequence, but on which some operations, such as
map
andfilter
, are implemented lazily.var underestimatedCount: Int
A value less than or equal to the number of elements in the sequence, calculated nondestructively.
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 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 drop(while: (Self.Element) throws -> Bool
) rethrows -> DropWhileSequence<Self> Returns a sequence by skipping the initial, consecutive elements that satisfy the given predicate.
func dropFirst(Int
) -> DropFirstSequence<Self> Returns a sequence containing all but the given number of initial elements.
func dropLast(Int
) -> [Self.Element] Returns a sequence containing all but the given 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 first(where: (Self.Element) throws -> Bool
) rethrows -> Self.Element? Returns the first element of the sequence that 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 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 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
) -> PrefixSequence<Self> Returns a sequence, up to the specified maximum length, containing the initial elements of the sequence.
func prefix(while: (Self.Element) throws -> Bool
) rethrows -> [Self.Element] Returns a sequence containing the initial, consecutive elements that satisfy the given predicate.
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 reversed(
) -> [Self.Element] Returns an array containing the elements of this sequence 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 split(maxSplits: Int, omittingEmptySubsequences: Bool, whereSeparator: (Self.Element) throws -> Bool
) rethrows -> [ArraySlice<Self.Element>] Returns the longest possible subsequences of the sequence, in order, that don’t contain elements satisfying the given predicate. Elements that are used to split the sequence are not returned as part of any subsequence.
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.Element] Returns a subsequence, up to the given maximum length, containing the final elements of the sequence.
func withContiguousStorageIfAvailable<R>((UnsafeBufferPointer<Self.Element>) throws -> R
) rethrows -> R?