Get specified Rectangle of values from 2D Array in Swift

Question

I\'ve an 2D Int array.

let array: [[Int]] = [
    
        [1,2,3,4,5,6,7,8],
        [10,20,30,40,50,60,70,80],
        [11,21,31,41,51,61,71,81],
        [12,22