mirror of
https://github.com/Instagram/IGListKit
synced 2026-05-06 15:08:50 +00:00
8d8a632b67
Summary: Updating license language to meet FB open source standards. Pull Request resolved: https://github.com/Instagram/IGListKit/pull/1272 Differential Revision: D12844366 Pulled By: rnystrom fbshipit-source-id: 27ae49ae00d963c5c012c79c5738365c232a5773
45 lines
1.4 KiB
Swift
45 lines
1.4 KiB
Swift
/**
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Copyright (c) Facebook, Inc. and its affiliates.
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The examples provided by Facebook are for non-commercial testing and evaluation
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purposes only. Facebook reserves all rights not expressly granted.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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FACEBOOK BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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import Foundation
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extension MutableCollection {
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/// Shuffles the contents of this collection.
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mutating func shuffle() {
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guard count > 1 else { return }
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for (firstUnshuffled, unshuffledCount) in zip(indices, stride(from: count, to: 1, by: -1)) {
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let distance: Int = numericCast(arc4random_uniform(numericCast(unshuffledCount)))
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guard distance != 0 else { continue }
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let shuffleIndex = index(firstUnshuffled, offsetBy: distance)
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self.swapAt(firstUnshuffled, shuffleIndex)
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}
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}
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}
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extension Sequence {
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/// Returns an array with the contents of this sequence, shuffled.
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var shuffled: [Iterator.Element] {
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var result = Array(self)
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result.shuffle()
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return result
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}
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}
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