let arr = [3,5,1,2]
//最大值
let max:Int = arr.max()!
//最小值
let min:Int = arr.min()!
//总和
let sum = arr.reduce(0) {
$0 + $1 }
//平均数
let average = sum/arr.count
print(max)
print(min)
print(sum)
print(average)
运行结果:
5
1
11
2