iOS swift5 max min sum sum average

        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)

operation result:

5
1
11
2