1.元組<可返回多個(gè)值>

//元組<多個(gè)返回值>
func calculateStatustics(scores:[Int]) -> (min:Int,max:Int,sum:Int) {
    var min = scores[0]
    var max = scores[0]
    var sum = 0
    
    for score in scores {
        if score > max {
            max = score
        } else if score < min {
            min = score
        }
        sum += score
    }
    return (min,max,sum)
}
let statistics = calculateStatustics(scores: [5,3,52,100,95])

獲取到的元組數(shù)據(jù)可通過'點(diǎn)方法'或下標(biāo)的方式取值

print(statistics.min)
print(statistics.max)
print(statistics.sum)

print(statistics.0)
print(statistics.1)
print(statistics.2)

2.可變參數(shù)個(gè)數(shù)的函數(shù)
2.1<求和函數(shù)>

func sumOf(numbers:Int...) -> Int {
    var sum = 0
    for number in numbers {
        sum += number
    }
    return sum
}
sumOf()
sumOf(numbers: 1,2,3,4)

2.2<求平均值函數(shù)>

//計(jì)算平均值
func averageOf(numbers:Float...) -> Float {
    var sum :Float = 0
    for number in numbers {
        sum += number
    }
    //要做類型轉(zhuǎn)換
    return sum/Float(numbers.count)
}
averageOf(numbers: 1,2,3,4)

3.函數(shù)作為參數(shù)進(jìn)行傳遞

//函數(shù)作為參數(shù)傳遞
func hasAnyMatches(list:[Int],condition:(Int) -> Bool) -> Bool {
    for item in list {
        if condition(item) { //condition 是傳入的函數(shù)體
            return true
        }
    }
    return false
}
func lessThanTen(number:Int) -> Bool {
    return number < 10
}
var numbers = [20,19,7,12]
hasAnyMatches(list: numbers, condition: lessThanTen)