您可以进行扩展,以便它可以返回两个数组的数组,使用Ints,Strings等：
extension Array {
func split() -> [[Element]] {
let ct = self.count
let half = ct / 2
let leftSplit = self[0 ..< half]
let rightSplit = self[half ..< ct]
return [Array(leftSplit),Array(rightSplit)]
}
}
let deck = ["J","Q","K","A"]
let nums = [0,1,2,3,4]
deck.split() // [["J","Q"],["K","A"]]
nums.split() // [[0,1],[2,4]]
但返回一个命名元组甚至更好,因为它强制执行这样一个事实：你期望正好两个数组：
extension Array {
func split() -> (left: [Element],right: [Element]) {
let ct = self.count
let half = ct / 2
let leftSplit = self[0 ..< half]
let rightSplit = self[half ..< ct]
return (left: Array(leftSplit),right: Array(rightSplit))
}
}
let deck = ["J","A"]
let splitDeck = deck.split()
print(splitDeck.left) // ["J","Q"]
print(splitDeck.right) // ["K","A"]
注意：获得第一个正确答案的是Andrei和Qbyte,我只是添加信息.
