Generic Instance Method

shuffled(using:)

Returns the elements of the sequence, shuffled using the given generator as a source for randomness.

Declaration

func shuffled<T>(using generator: inout T) -> [Element] where T : RandomNumberGenerator

Parameters

generator

The random number generator to use when shuffling the sequence.

Return Value

An array of this sequence’s elements in a shuffled order.

Discussion

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]

Complexity: O(n), where n is the length of the sequence.

See Also

Transforming a Set

func map<T>((Element) -> T) -> [T]

Returns an array containing the results of mapping the given closure over the sequence’s elements.

func compactMap<ElementOfResult>((Element) -> ElementOfResult?) -> [ElementOfResult]

Returns an array containing the non-nil results of calling the given transformation with each element of this sequence.

func flatMap<SegmentOfResult>((Element) -> SegmentOfResult) -> [SegmentOfResult.Element]

Returns an array containing the concatenated results of calling the given transformation with each element of this sequence.

func flatMap<ElementOfResult>((Element) -> ElementOfResult?) -> [ElementOfResult]Deprecated
func reduce<Result>(Result, (Result, Element) -> Result) -> Result

Returns the result of combining the elements of the sequence using the given closure.

func reduce<Result>(into: Result, (inout Result, Element) -> ()) -> Result

Returns the result of combining the elements of the sequence using the given closure.

func sorted() -> [Element]

Returns the elements of the sequence, sorted.

Available when Element conforms to Comparable.
func sorted(by: (Element, Element) -> Bool) -> [Element]

Returns the elements of the sequence, sorted using the given predicate as the comparison between elements.

func shuffled() -> [Element]

Returns the elements of the sequence, shuffled.

var lazy: LazySequence<Set<Element>>

A sequence containing the same elements as this sequence, but on which some operations, such as map and filter, are implemented lazily.