1.元组<可返回多个值>
//元组<多个返回值>
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])
获取到的元组数据可通过'点方法'或下标的方式取值
print(statistics.min)
print(statistics.max)
print(statistics.sum)
print(statistics.0)
print(statistics.1)
print(statistics.2)
2.可变参数个数的函数
2.1<求和函数>
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<求平均值函数>
//计算平均值
func averageOf(numbers:Float...) -> Float {
var sum :Float = 0
for number in numbers {
sum += number
}
//要做类型转换
return sum/Float(numbers.count)
}
averageOf(numbers: 1,2,3,4)
3.函数作为参数进行传递
//函数作为参数传递
func hasAnyMatches(list:[Int],condition:(Int) -> Bool) -> Bool {
for item in list {
if condition(item) { //condition 是传入的函数体
return true
}
}
return false
}
func lessThanTen(number:Int) -> Bool {
return number < 10
}
var numbers = [20,19,7,12]
hasAnyMatches(list: numbers, condition: lessThanTen)
