when i add these 2 multi - dimensional array i am not getting sum of the array rather it is concatenation process so guys can you help me out
I am not getting the proper answer for this 2D array addition guys can anybody help me
Either you expect the + operator on arrays to do something it does not do, or you don't appreciate what you're applying the + operator in the expression { $0 + $1 } to. From https://developer.apple.com/documentation/swift/array
static func + (lhs: Array<Element>, rhs: Array<Element>) -> Array<Element>
this is the + you are using - it takes an Array of ints on each side, and returns another array of ints. The new array is a combination of the two (by appending the $1 to $0), not an array constructed by member wise addition.
To do what you intend, you need to dip one level deeper so that you call zip on an array of ints, not an array of arrays of int. Then the + operator would be the usual one which adds two integers.