Swift Array Shuffle

ArrayShuffle.swift

import Foundation

extension CollectionType where Index == Int {
	func shuffle() -> [Generator.Element] {
		var list = Array(self)
		list.shuffleInPlace()
		return list
	}
}

extension MutableCollectionType where Index == Int {
	mutating func shuffleInPlace() {
		if count < 2 {
			return
		}
		
		for i in 0..<count - 1 {
			let j = Int(arc4random_uniform(UInt32(count - i))) + i
			guard i != j else { continue }
			swap(&self[i], &self[j])
		}
	}
}

// Using

var array = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
array.shuffleInPlace()
print(array)