Switch the rows and colums in Swift for vectors ( [[T]] ).

switchMatrixVectors.swift

func determineLongestItem<T>(in matrix: [[T]]) -> Int {
    var maxLength = 0
    for item in matrix {
        if item.count > maxLength {
            maxLength = item.count
        }
    }
    return maxLength
}

func switchMatrixVectors<T>(for originalMatrix: [[T]]) -> [[T?]] {
    let longestItemInOriginalMatrix = determineLongestItem(in: originalMatrix)
    
    //Create an empty matrix of the same size
    var newMatrix = [[T?]]()
    
    for _ in 1...longestItemInOriginalMatrix {
        newMatrix.append([])
    }
    
    // Fill up data
    for index in 0...determineLongestItem(in: originalMatrix) - 1 {
        for row in originalMatrix {
            if index < row.count {
                newMatrix[index].append(row[index])
            } else {
                    newMatrix[index].append(nil)
            }
        }
    }
    return newMatrix
}