mirror of
https://github.com/Instagram/IGListKit
synced 2026-05-06 15:08:50 +00:00
f7220b5cfe
Summary: Used migration tool with Swift 4, fixed build errors, and killed all warnings. Only non-trivial change was in the macOS example. Will flag that one. No changelog needed for this, right? - [x] All tests pass. Demo project builds and runs. Closes https://github.com/Instagram/IGListKit/pull/941 Differential Revision: D5890505 Pulled By: rnystrom fbshipit-source-id: 7e0d3510ff0e5856a0ffd59f1a97548a72266c20
46 lines
1.4 KiB
Swift
46 lines
1.4 KiB
Swift
/**
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Copyright (c) 2016-present, Facebook, Inc. All rights reserved.
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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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let c = count
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guard c > 1 else { return }
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for (firstUnshuffled, unshuffledCount) in zip(indices, stride(from: c, to: 1, by: -1)) {
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let d: IndexDistance = numericCast(arc4random_uniform(numericCast(unshuffledCount)))
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guard d != 0 else { continue }
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let i = index(firstUnshuffled, offsetBy: d)
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self.swapAt(firstUnshuffled, i)
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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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