Instance Methodswift 6.0.1Swift
shuffled(using:)
Returns the elements of the sequence, shuffled using the given generator as a source for randomness.
func shuffled<T>(using generator: inout T) -> [Self.Element] where T : RandomNumberGenerator
Parameters
- generator
The random number generator to use when shuffling the sequence.
Returns
An array of this sequence’s elements in a shuffled order.
You use this method to randomize the elements of a sequence when you are using a custom random number generator. For example, you can shuffle the numbers between 0
and 9
by calling the shuffled(using:)
method on that range:
let numbers = 0...9
let shuffledNumbers = numbers.shuffled(using: &myGenerator)
// shuffledNumbers == [8, 9, 4, 3, 2, 6, 7, 0, 5, 1]
Other members in extension
Instance members
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 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?