在playgroundm内键入以下代码，求一个成绩数组内最大分值和最小分值
func maxminScore(scores:Array<Int>) -> (maxScore:Int,minScore:Int)? { //一个可以空的Tuple
if scores.isEmpty{
return nil //判断是否有值，没值就返回一个空值
}
var maxScore = scores[0], minScore = scores[0]
for score in scores[1..<scores.count]{
maxScore = max(maxScore, score)
minScore = min(minScore, score)
}
return (maxScore: maxScore, minScore: minScore) //返回结果
}
var scores:[Int]? = [60,80,90,100,30,26,87]
var allScores = scores ?? []
if let result = maxminScore(allScores){
println("The maximum score is \(result.maxScore)")
println("The minimum score is \(result.minScore)")
}
//使用Tuple.下标访问元素
if let result = maxminScore(allScores){
println("The maximum score is \(result.0)")
println("The minimum score is \(result.1)")
}
//给返回的值赋值给变量后可以直接使用
if let (a,b) = maxminScore(allScores){
println("The maximum score is \(a)")
println("The minimum score is \(b)")
}
原文：http://www.cnblogs.com/foxting/p/4486452.html