swift - Join Multidimension Arrays -

i have multiple arrays of different sizes, instance:

let array1 = [[1, 2, 3], [1, 2, 3]] let array2 = [[1, 2], [1, 2]] let array3 = [[1, 2], [1, 2], [1, 2]] 

and wanna join them final array:

let finalarray = [[1, 2, 3, 1, 2, 1, 2], [1, 2, 3, 1, 2, 1, 2], [1, 2]] 

any ideia on how can achieve goal in efficient way?

try this:

var finalarray:[[int]] = [] index in 0..<max(array1.count,array2.count,array3.count) {     finalarray.append([])     if index < array1.count {         finalarray[index].appendcontentsof(array1[index])     }     if index < array2.count {         finalarray[index].appendcontentsof(array2[index])     }     if index < array3.count{         finalarray[index].appendcontentsof(array3[index])     } } finalarray // [[1, 2, 3, 1, 2, 1, 2], [1, 2, 3, 1, 2, 1, 2], [1, 2]]